From 47f63a8554349c3db7afa0b37e846c158b2fc154 Mon Sep 17 00:00:00 2001
From: Romeo Rosete <110788242+bombastictranz@users.noreply.github.com>
Date: Wed, 24 Apr 2024 07:42:23 -0400
Subject: [PATCH 1/3] 654613002(1).html

Stock control supervisors
---
 654613002(1).html | 6809 +++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 6809 insertions(+)
 create mode 100644 654613002(1).html
diff --git a/654613002(1).html b/654613002(1).html
new file mode 100644
index 0000000000..557d282a52
--- /dev/null
+++ b/654613002(1).html
@@ -0,0 +1,6809 @@
+<!DOCTYPE html>
+<!-- saved from url=(0029)chrome-error://chromewebdata/ -->
+<html dir="ltr" lang="en" subframe=""><head><meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
+  
+  <meta name="color-scheme" content="light dark">
+  <meta name="theme-color" content="#fff">
+  <meta name="viewport" content="width=device-width, initial-scale=1.0,
+                                 maximum-scale=1.0, user-scalable=no">
+  <title>td.doubleclick.net</title>
+  <style>/* Copyright 2017 The Chromium Authors
+ * Use of this source code is governed by a BSD-style license that can be
+ * found in the LICENSE file. */
+
+a {
+  color: var(--link-color);
+}
+
+body {
+  --background-color: #fff;
+  --error-code-color: var(--google-gray-700);
+  --google-blue-100: rgb(210, 227, 252);
+  --google-blue-300: rgb(138, 180, 248);
+  --google-blue-600: rgb(26, 115, 232);
+  --google-blue-700: rgb(25, 103, 210);
+  --google-gray-100: rgb(241, 243, 244);
+  --google-gray-300: rgb(218, 220, 224);
+  --google-gray-500: rgb(154, 160, 166);
+  --google-gray-50: rgb(248, 249, 250);
+  --google-gray-600: rgb(128, 134, 139);
+  --google-gray-700: rgb(95, 99, 104);
+  --google-gray-800: rgb(60, 64, 67);
+  --google-gray-900: rgb(32, 33, 36);
+  --heading-color: var(--google-gray-900);
+  --link-color: rgb(88, 88, 88);
+  --popup-container-background-color: rgba(0,0,0,.65);
+  --primary-button-fill-color-active: var(--google-blue-700);
+  --primary-button-fill-color: var(--google-blue-600);
+  --primary-button-text-color: #fff;
+  --quiet-background-color: rgb(247, 247, 247);
+  --secondary-button-border-color: var(--google-gray-500);
+  --secondary-button-fill-color: #fff;
+  --secondary-button-hover-border-color: var(--google-gray-600);
+  --secondary-button-hover-fill-color: var(--google-gray-50);
+  --secondary-button-text-color: var(--google-gray-700);
+  --small-link-color: var(--google-gray-700);
+  --text-color: var(--google-gray-700);
+  background: var(--background-color);
+  color: var(--text-color);
+  word-wrap: break-word;
+}
+
+.nav-wrapper .secondary-button {
+  background: var(--secondary-button-fill-color);
+  border: 1px solid var(--secondary-button-border-color);
+  color: var(--secondary-button-text-color);
+  float: none;
+  margin: 0;
+  padding: 8px 16px;
+}
+
+.hidden {
+  display: none;
+}
+
+html {
+  -webkit-text-size-adjust: 100%;
+  font-size: 125%;
+}
+
+.icon {
+  background-repeat: no-repeat;
+  background-size: 100%;
+}
+
+@media (prefers-color-scheme: dark) {
+  body {
+    --background-color: var(--google-gray-900);
+    --error-code-color: var(--google-gray-500);
+    --heading-color: var(--google-gray-500);
+    --link-color: var(--google-blue-300);
+    --primary-button-fill-color-active: rgb(129, 162, 208);
+    --primary-button-fill-color: var(--google-blue-300);
+    --primary-button-text-color: var(--google-gray-900);
+    --quiet-background-color: var(--background-color);
+    --secondary-button-border-color: var(--google-gray-700);
+    --secondary-button-fill-color: var(--google-gray-900);
+    --secondary-button-hover-fill-color: rgb(48, 51, 57);
+    --secondary-button-text-color: var(--google-blue-300);
+    --small-link-color: var(--google-blue-300);
+    --text-color: var(--google-gray-500);
+  }
+}
+</style>
+  <style>/* Copyright 2014 The Chromium Authors
+   Use of this source code is governed by a BSD-style license that can be
+   found in the LICENSE file. */
+
+button {
+  border: 0;
+  border-radius: 20px;
+  box-sizing: border-box;
+  color: var(--primary-button-text-color);
+  cursor: pointer;
+  float: right;
+  font-size: .875em;
+  margin: 0;
+  padding: 8px 16px;
+  transition: box-shadow 150ms cubic-bezier(0.4, 0, 0.2, 1);
+  user-select: none;
+}
+
+[dir='rtl'] button {
+  float: left;
+}
+
+.bad-clock button,
+.captive-portal button,
+.https-only button,
+.insecure-form button,
+.lookalike-url button,
+.main-frame-blocked button,
+.neterror button,
+.pdf button,
+.ssl button,
+.enterprise-block button,
+.enterprise-warn button,
+.safe-browsing-billing button {
+  background: var(--primary-button-fill-color);
+}
+
+button:active {
+  background: var(--primary-button-fill-color-active);
+  outline: 0;
+}
+
+#debugging {
+  display: inline;
+  overflow: auto;
+}
+
+.debugging-content {
+  line-height: 1em;
+  margin-bottom: 0;
+  margin-top: 1em;
+}
+
+.debugging-content-fixed-width {
+  display: block;
+  font-family: monospace;
+  font-size: 1.2em;
+  margin-top: 0.5em;
+}
+
+.debugging-title {
+  font-weight: bold;
+}
+
+#details {
+  margin: 0 0 50px;
+}
+
+#details p:not(:first-of-type) {
+  margin-top: 20px;
+}
+
+.secondary-button:active {
+  border-color: white;
+  box-shadow: 0 1px 2px 0 rgba(60, 64, 67, .3),
+      0 2px 6px 2px rgba(60, 64, 67, .15);
+}
+
+.secondary-button:hover {
+  background: var(--secondary-button-hover-fill-color);
+  border-color: var(--secondary-button-hover-border-color);
+  text-decoration: none;
+}
+
+.error-code {
+  color: var(--error-code-color);
+  font-size: .8em;
+  margin-top: 12px;
+  text-transform: uppercase;
+}
+
+#error-debugging-info {
+  font-size: 0.8em;
+}
+
+h1 {
+  color: var(--heading-color);
+  font-size: 1.6em;
+  font-weight: normal;
+  line-height: 1.25em;
+  margin-bottom: 16px;
+}
+
+h2 {
+  font-size: 1.2em;
+  font-weight: normal;
+}
+
+.icon {
+  height: 72px;
+  margin: 0 0 40px;
+  width: 72px;
+}
+
+input[type=checkbox] {
+  opacity: 0;
+}
+
+input[type=checkbox]:focus ~ .checkbox::after {
+  outline: -webkit-focus-ring-color auto 5px;
+}
+
+.interstitial-wrapper {
+  box-sizing: border-box;
+  font-size: 1em;
+  line-height: 1.6em;
+  margin: 14vh auto 0;
+  max-width: 600px;
+  width: 100%;
+}
+
+#main-message > p {
+  display: inline;
+}
+
+#extended-reporting-opt-in {
+  font-size: .875em;
+  margin-top: 32px;
+}
+
+#extended-reporting-opt-in label {
+  display: grid;
+  grid-template-columns: 1.8em 1fr;
+  position: relative;
+}
+
+#enhanced-protection-message {
+  border-radius: 20px;
+  font-size: 1em;
+  margin-top: 32px;
+  padding: 10px 5px;
+}
+
+#enhanced-protection-message a {
+  color: var(--google-red-10);
+}
+
+#enhanced-protection-message label {
+  display: grid;
+  grid-template-columns: 2.5em 1fr;
+  position: relative;
+}
+
+#enhanced-protection-message div {
+  margin: 0.5em;
+}
+
+#enhanced-protection-message .icon {
+  height: 1.5em;
+  vertical-align: middle;
+  width: 1.5em;
+}
+
+.nav-wrapper {
+  margin-top: 51px;
+}
+
+.nav-wrapper::after {
+  clear: both;
+  content: '';
+  display: table;
+  width: 100%;
+}
+
+.small-link {
+  color: var(--small-link-color);
+  font-size: .875em;
+}
+
+.checkboxes {
+  flex: 0 0 24px;
+}
+
+.checkbox {
+  --padding: .9em;
+  background: transparent;
+  display: block;
+  height: 1em;
+  left: -1em;
+  padding-inline-start: var(--padding);
+  position: absolute;
+  right: 0;
+  top: -.5em;
+  width: 1em;
+}
+
+.checkbox::after {
+  border: 1px solid white;
+  border-radius: 2px;
+  content: '';
+  height: 1em;
+  left: var(--padding);
+  position: absolute;
+  top: var(--padding);
+  width: 1em;
+}
+
+.checkbox::before {
+  background: transparent;
+  border: 2px solid white;
+  border-inline-end-width: 0;
+  border-top-width: 0;
+  content: '';
+  height: .2em;
+  left: calc(.3em + var(--padding));
+  opacity: 0;
+  position: absolute;
+  top: calc(.3em  + var(--padding));
+  transform: rotate(-45deg);
+  width: .5em;
+}
+
+input[type=checkbox]:checked ~ .checkbox::before {
+  opacity: 1;
+}
+
+#recurrent-error-message {
+  background: #ededed;
+  border-radius: 4px;
+  margin-bottom: 16px;
+  margin-top: 12px;
+  padding: 12px 16px;
+}
+
+.showing-recurrent-error-message #extended-reporting-opt-in {
+  margin-top: 16px;
+}
+
+.showing-recurrent-error-message #enhanced-protection-message {
+  margin-top: 16px;
+}
+
+@media (max-width: 700px) {
+  .interstitial-wrapper {
+    padding: 0 10%;
+  }
+
+  #error-debugging-info {
+    overflow: auto;
+  }
+}
+
+@media (max-width: 420px) {
+  button,
+  [dir='rtl'] button,
+  .small-link {
+    float: none;
+    font-size: .825em;
+    font-weight: 500;
+    margin: 0;
+    width: 100%;
+  }
+
+  button {
+    padding: 16px 24px;
+  }
+
+  #details {
+    margin: 20px 0 20px 0;
+  }
+
+  #details p:not(:first-of-type) {
+    margin-top: 10px;
+  }
+
+  .secondary-button:not(.hidden) {
+    display: block;
+    margin-top: 20px;
+    text-align: center;
+    width: 100%;
+  }
+
+  .interstitial-wrapper {
+    padding: 0 5%;
+  }
+
+  #extended-reporting-opt-in {
+    margin-top: 24px;
+  }
+
+  #enhanced-protection-message {
+    margin-top: 24px;
+  }
+
+  .nav-wrapper {
+    margin-top: 30px;
+  }
+}
+
+/**
+ * Mobile specific styling.
+ * Navigation buttons are anchored to the bottom of the screen.
+ * Details message replaces the top content in its own scrollable area.
+ */
+
+@media (max-width: 420px) {
+  .nav-wrapper .secondary-button {
+    border: 0;
+    margin: 16px 0 0;
+    margin-inline-end: 0;
+    padding-bottom: 16px;
+    padding-top: 16px;
+  }
+}
+
+/* Fixed nav. */
+@media (min-width: 240px) and (max-width: 420px) and
+       (min-height: 401px),
+       (min-width: 421px) and (min-height: 240px) and
+       (max-height: 560px) {
+  body .nav-wrapper {
+    background: var(--background-color);
+    bottom: 0;
+    box-shadow: 0 -12px 24px var(--background-color);
+    left: 0;
+    margin: 0 auto;
+    max-width: 736px;
+    padding-inline-end: 24px;
+    padding-inline-start: 24px;
+    position: fixed;
+    right: 0;
+    width: 100%;
+    z-index: 2;
+  }
+
+  .interstitial-wrapper {
+    max-width: 736px;
+  }
+
+  #details,
+  #main-content {
+    padding-bottom: 40px;
+  }
+
+  #details {
+    padding-top: 5.5vh;
+  }
+
+  button.small-link {
+    color: var(--google-blue-600);
+  }
+}
+
+@media (max-width: 420px) and (orientation: portrait),
+       (max-height: 560px) {
+  body {
+    margin: 0 auto;
+  }
+
+  button,
+  [dir='rtl'] button,
+  button.small-link,
+  .nav-wrapper .secondary-button {
+    font-family: Roboto-Regular,Helvetica;
+    font-size: .933em;
+    margin: 6px 0;
+    transform: translatez(0);
+  }
+
+  .nav-wrapper {
+    box-sizing: border-box;
+    padding-bottom: 8px;
+    width: 100%;
+  }
+
+  #details {
+    box-sizing: border-box;
+    height: auto;
+    margin: 0;
+    opacity: 1;
+    transition: opacity 250ms cubic-bezier(0.4, 0, 0.2, 1);
+  }
+
+  #details.hidden,
+  #main-content.hidden {
+    height: 0;
+    opacity: 0;
+    overflow: hidden;
+    padding-bottom: 0;
+    transition: none;
+  }
+
+  h1 {
+    font-size: 1.5em;
+    margin-bottom: 8px;
+  }
+
+  .icon {
+    margin-bottom: 5.69vh;
+  }
+
+  .interstitial-wrapper {
+    box-sizing: border-box;
+    margin: 7vh auto 12px;
+    padding: 0 24px;
+    position: relative;
+  }
+
+  .interstitial-wrapper p {
+    font-size: .95em;
+    line-height: 1.61em;
+    margin-top: 8px;
+  }
+
+  #main-content {
+    margin: 0;
+    transition: opacity 100ms cubic-bezier(0.4, 0, 0.2, 1);
+  }
+
+  .small-link {
+    border: 0;
+  }
+
+  .suggested-left > #control-buttons,
+  .suggested-right > #control-buttons {
+    float: none;
+    margin: 0;
+  }
+}
+
+@media (min-width: 421px) and (min-height: 500px) and (max-height: 560px) {
+  .interstitial-wrapper {
+    margin-top: 10vh;
+  }
+}
+
+@media (min-height: 400px) and (orientation:portrait) {
+  .interstitial-wrapper {
+    margin-bottom: 145px;
+  }
+}
+
+@media (min-height: 299px) {
+  .nav-wrapper {
+    padding-bottom: 16px;
+  }
+}
+
+@media (max-height: 560px) and (min-height: 240px) and (orientation:landscape) {
+  .extended-reporting-has-checkbox #details {
+    padding-bottom: 80px;
+  }
+}
+
+@media (min-height: 500px) and (max-height: 650px) and (max-width: 414px) and
+       (orientation: portrait) {
+  .interstitial-wrapper {
+    margin-top: 7vh;
+  }
+}
+
+@media (min-height: 650px) and (max-width: 414px) and (orientation: portrait) {
+  .interstitial-wrapper {
+    margin-top: 10vh;
+  }
+}
+
+/* Small mobile screens. No fixed nav. */
+@media (max-height: 400px) and (orientation: portrait),
+       (max-height: 239px) and (orientation: landscape),
+       (max-width: 419px) and (max-height: 399px) {
+  .interstitial-wrapper {
+    display: flex;
+    flex-direction: column;
+    margin-bottom: 0;
+  }
+
+  #details {
+    flex: 1 1 auto;
+    order: 0;
+  }
+
+  #main-content {
+    flex: 1 1 auto;
+    order: 0;
+  }
+
+  .nav-wrapper {
+    flex: 0 1 auto;
+    margin-top: 8px;
+    order: 1;
+    padding-inline-end: 0;
+    padding-inline-start: 0;
+    position: relative;
+    width: 100%;
+  }
+
+  button,
+  .nav-wrapper .secondary-button {
+    padding: 16px 24px;
+  }
+
+  button.small-link {
+    color: var(--google-blue-600);
+  }
+}
+
+@media (max-width: 239px) and (orientation: portrait) {
+  .nav-wrapper {
+    padding-inline-end: 0;
+    padding-inline-start: 0;
+  }
+}
+</style>
+  <style>/* Copyright 2013 The Chromium Authors
+ * Use of this source code is governed by a BSD-style license that can be
+ * found in the LICENSE file. */
+
+/* Don't use the main frame div when the error is in a subframe. */
+html[subframe] #main-frame-error {
+  display: none;
+}
+
+/* Don't use the subframe error div when the error is in a main frame. */
+html:not([subframe]) #sub-frame-error {
+  display: none;
+}
+
+h1 {
+  margin-top: 0;
+  word-wrap: break-word;
+}
+
+h1 span {
+  font-weight: 500;
+}
+
+a {
+  text-decoration: none;
+}
+
+.icon {
+  -webkit-user-select: none;
+  display: inline-block;
+}
+
+.icon-generic {
+  /* Can't access chrome://theme/IDR_ERROR_NETWORK_GENERIC from an untrusted
+   * renderer process, so embed the resource manually. */
+  content: image-set(
+      url(data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAEgAAABIAQMAAABvIyEEAAAABlBMVEUAAABTU1OoaSf/AAAAAXRSTlMAQObYZgAAAENJREFUeF7tzbEJACEQRNGBLeAasBCza2lLEGx0CxFGG9hBMDDxRy/72O9FMnIFapGylsu1fgoBdkXfUHLrQgdfrlJN1BdYBjQQm3UAAAAASUVORK5CYII=) 1x,
+      url(data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAJAAAACQAQMAAADdiHD7AAAABlBMVEUAAABTU1OoaSf/AAAAAXRSTlMAQObYZgAAAFJJREFUeF7t0cENgDAMQ9FwYgxG6WjpaIzCCAxQxVggFuDiCvlLOeRdHR9yzjncHVoq3npu+wQUrUuJHylSTmBaespJyJQoObUeyxDQb3bEm5Au81c0pSCD8HYAAAAASUVORK5CYII=) 2x);
+}
+
+.icon-info {
+  content: image-set(
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+
+#suggestions-list a {
+  color: var(--google-blue-600);
+}
+
+#suggestions-list p {
+  margin-block-end: 0;
+}
+
+#suggestions-list ul {
+  margin-top: 0;
+}
+
+.single-suggestion {
+  list-style-type: none;
+  padding-inline-start: 0;
+}
+
+#error-information-button {
+  content: url(data:image/svg+xml;base64,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);
+  height: 24px;
+  vertical-align: -.15em;
+  width: 24px;
+}
+
+.use-popup-container#error-information-popup-container
+  #error-information-popup {
+  align-items: center;
+  background-color: var(--popup-container-background-color);
+  display: flex;
+  height: 100%;
+  left: 0;
+  position: fixed;
+  top: 0;
+  width: 100%;
+  z-index: 100;
+}
+
+.use-popup-container#error-information-popup-container
+  #error-information-popup-content > p {
+  margin-bottom: 11px;
+  margin-inline-start: 20px;
+}
+
+.use-popup-container#error-information-popup-container #suggestions-list ul {
+  margin-inline-start: 15px;
+}
+
+.use-popup-container#error-information-popup-container
+  #error-information-popup-box {
+  background-color: var(--background-color);
+  left: 5%;
+  padding-bottom: 15px;
+  padding-top: 15px;
+  position: fixed;
+  width: 90%;
+  z-index: 101;
+}
+
+.use-popup-container#error-information-popup-container div.error-code {
+  margin-inline-start: 20px;
+}
+
+.use-popup-container#error-information-popup-container #suggestions-list p {
+  margin-inline-start: 20px;
+}
+
+:not(.use-popup-container)#error-information-popup-container
+  #error-information-popup-close {
+  display: none;
+}
+
+#error-information-popup-close {
+  margin-bottom: 0;
+  margin-inline-end: 35px;
+  margin-top: 15px;
+  text-align: end;
+}
+
+.link-button {
+  color: rgb(66, 133, 244);
+  display: inline-block;
+  font-weight: bold;
+  text-transform: uppercase;
+}
+
+#sub-frame-error-details {
+
+  color: #8F8F8F;
+
+  /* Not done on mobile for performance reasons. */
+  text-shadow: 0 1px 0 rgba(255,255,255,0.3);
+
+}
+
+[jscontent=hostName],
+[jscontent=failedUrl] {
+  overflow-wrap: break-word;
+}
+
+.secondary-button {
+  background: #d9d9d9;
+  color: #696969;
+  margin-inline-end: 16px;
+}
+
+.snackbar {
+  background: #323232;
+  border-radius: 2px;
+  bottom: 24px;
+  box-sizing: border-box;
+  color: #fff;
+  font-size: .87em;
+  left: 24px;
+  max-width: 568px;
+  min-width: 288px;
+  opacity: 0;
+  padding: 16px 24px 12px;
+  position: fixed;
+  transform: translateY(90px);
+  will-change: opacity, transform;
+  z-index: 999;
+}
+
+.snackbar-show {
+  -webkit-animation:
+    show-snackbar 250ms cubic-bezier(0, 0, 0.2, 1) forwards,
+    hide-snackbar 250ms cubic-bezier(0.4, 0, 1, 1) forwards 5s;
+}
+
+@-webkit-keyframes show-snackbar {
+  100% {
+    opacity: 1;
+    transform: translateY(0);
+  }
+}
+
+@-webkit-keyframes hide-snackbar {
+  0% {
+    opacity: 1;
+    transform: translateY(0);
+  }
+  100% {
+    opacity: 0;
+    transform: translateY(90px);
+  }
+}
+
+.suggestions {
+  margin-top: 18px;
+}
+
+.suggestion-header {
+  font-weight: bold;
+  margin-bottom: 4px;
+}
+
+.suggestion-body {
+  color: #777;
+}
+
+/* Decrease padding at low sizes. */
+@media (max-width: 640px), (max-height: 640px) {
+  h1 {
+    margin: 0 0 15px;
+  }
+  .suggestions {
+    margin-top: 10px;
+  }
+  .suggestion-header {
+    margin-bottom: 0;
+  }
+}
+
+#download-link,
+#download-link-clicked {
+  margin-bottom: 30px;
+  margin-top: 30px;
+}
+
+#download-link-clicked {
+  color: #BBB;
+}
+
+#download-link::before,
+#download-link-clicked::before {
+  content: url(data:image/svg+xml;base64,PHN2ZyB4bWxucz0iaHR0cDovL3d3dy53My5vcmcvMjAwMC9zdmciIHdpZHRoPSIxLjJlbSIgaGVpZ2h0PSIxLjJlbSIgdmlld0JveD0iMCAwIDI0IDI0Ij48cGF0aCBkPSJNNSAyMGgxNHYtMkg1bTE0LTloLTRWM0g5djZINWw3IDcgNy03eiIgZmlsbD0iIzQyODVGNCIvPjwvc3ZnPg==);
+  display: inline-block;
+  margin-inline-end: 4px;
+  vertical-align: -webkit-baseline-middle;
+}
+
+#download-link-clicked::before {
+  opacity: 0;
+  width: 0;
+}
+
+#offline-content-list-visibility-card {
+  border: 1px solid white;
+  border-radius: 8px;
+  display: flex;
+  font-size: .8em;
+  justify-content: space-between;
+  line-height: 1;
+}
+
+#offline-content-list.list-hidden #offline-content-list-visibility-card {
+  border-color: rgb(218, 220, 224);
+}
+
+#offline-content-list-visibility-card > div {
+  padding: 1em;
+}
+
+#offline-content-list-title {
+  color: var(--google-gray-700);
+}
+
+#offline-content-list-show-text,
+#offline-content-list-hide-text {
+  color: rgb(66, 133, 244);
+}
+
+/* Hides the "hide" text div when the offline content list is collapsed/hidden
+ * and, alternatively, hides the "show" text div when the offline content list
+ * is expanded/shown.
+ */
+#offline-content-list.list-hidden #offline-content-list-hide-text,
+#offline-content-list:not(.list-hidden) #offline-content-list-show-text {
+  display: none;
+}
+
+/* Controls the animation of the offline content list when it is expanded/shown.
+ */
+#offline-content-suggestions {
+  /* Max-height has to be set for the height animation to work. The chosen value
+   * is a little greater than the maximum height the list will have, when all
+   * suggestions have images, so that it is never clamped. This makes so that
+   * when the actual height is smaller then the animation is not as smooth.
+   */
+  max-height: 27em;
+  transition: max-height 200ms ease-in, visibility 0s 200ms,
+              opacity 200ms 200ms linear;
+}
+
+/* Controls the animation of the offline content list when it is
+ * collapsed/hidden.
+ */
+#offline-content-list.list-hidden #offline-content-suggestions {
+  max-height: 0;
+  opacity: 0;
+  transition: opacity 200ms linear, visibility 0s 200ms,
+              max-height 200ms 200ms ease-out;
+  visibility: hidden;
+}
+
+#offline-content-list {
+  margin-inline-start: -5%;
+  width: 110%;
+}
+
+/* The selectors below adjust the "overflow" of the suggestion cards contents
+ * based on the same screen size based strategy used for the main frame, which
+ * is applied by the `interstitial-wrapper` class. */
+@media (max-width: 420px)  {
+  #offline-content-list {
+    margin-inline-start: -2.5%;
+    width: 105%;
+  }
+}
+@media (max-width: 420px) and (orientation: portrait),
+       (max-height: 560px) {
+  #offline-content-list {
+    margin-inline-start: -12px;
+    width: calc(100% + 24px);
+  }
+}
+
+.suggestion-with-image .offline-content-suggestion-thumbnail {
+  flex-basis: 8.2em;
+  flex-shrink: 0;
+}
+
+.suggestion-with-image .offline-content-suggestion-thumbnail > img {
+  height: 100%;
+  width: 100%;
+}
+
+.suggestion-with-image #offline-content-list:not(.is-rtl)
+.offline-content-suggestion-thumbnail > img {
+  border-bottom-right-radius: 7px;
+  border-top-right-radius: 7px;
+}
+
+.suggestion-with-image #offline-content-list.is-rtl
+.offline-content-suggestion-thumbnail > img {
+  border-bottom-left-radius: 7px;
+  border-top-left-radius: 7px;
+}
+
+.suggestion-with-icon .offline-content-suggestion-thumbnail {
+  align-items: center;
+  display: flex;
+  justify-content: center;
+  min-height: 4.2em;
+  min-width: 4.2em;
+}
+
+.suggestion-with-icon .offline-content-suggestion-thumbnail > div {
+  align-items: center;
+  background-color: rgb(241, 243, 244);
+  border-radius: 50%;
+  display: flex;
+  height: 2.3em;
+  justify-content: center;
+  width: 2.3em;
+}
+
+.suggestion-with-icon .offline-content-suggestion-thumbnail > div > img {
+  height: 1.45em;
+  width: 1.45em;
+}
+
+.offline-content-suggestion-favicon {
+  height: 1em;
+  margin-inline-end: 0.4em;
+  width: 1.4em;
+}
+
+.offline-content-suggestion-favicon > img {
+  height: 1.4em;
+  width: 1.4em;
+}
+
+.no-favicon .offline-content-suggestion-favicon {
+  display: none;
+}
+
+.image-video {
+  content: url(data:image/svg+xml;base64,PHN2ZyB4bWxucz0iaHR0cDovL3d3dy53My5vcmcvMjAwMC9zdmciIHdpZHRoPSIyNCIgaGVpZ2h0PSIyNCIgdmlld0JveD0iMCAwIDI0IDI0Ij48cGF0aCBkPSJNMTcgMTAuNVY3YTEgMSAwIDAgMC0xLTFINGExIDEgMCAwIDAtMSAxdjEwYTEgMSAwIDAgMCAxIDFoMTJhMSAxIDAgMCAwIDEtMXYtMy41bDQgNHYtMTFsLTQgNHoiIGZpbGw9IiMzQzQwNDMiLz48L3N2Zz4=);
+}
+
+.image-music-note {
+  content: url(data:image/svg+xml;base64,PHN2ZyB4bWxucz0iaHR0cDovL3d3dy53My5vcmcvMjAwMC9zdmciIHdpZHRoPSIyNCIgaGVpZ2h0PSIyNCIgdmlld0JveD0iMCAwIDI0IDI0Ij48cGF0aCBkPSJNMTIgM3Y5LjI2Yy0uNS0uMTctMS0uMjYtMS41LS4yNkM4IDEyIDYgMTQgNiAxNi41UzggMjEgMTAuNSAyMXM0LjUtMiA0LjUtNC41VjZoNFYzaC03eiIgZmlsbD0iIzNDNDA0MyIvPjwvc3ZnPg==);
+}
+
+.image-earth {
+  content: url(data:image/svg+xml;base64,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);
+}
+
+.image-file {
+  content: url(data:image/svg+xml;base64,PHN2ZyB4bWxucz0iaHR0cDovL3d3dy53My5vcmcvMjAwMC9zdmciIHdpZHRoPSIyNCIgaGVpZ2h0PSIyNCIgdmlld0JveD0iMCAwIDI0IDI0Ij48cGF0aCBkPSJNMTMgOVYzLjVMMTguNSA5TTYgMmMtMS4xMSAwLTIgLjg5LTIgMnYxNmEyIDIgMCAwIDAgMiAyaDEyYTIgMiAwIDAgMCAyLTJWOGwtNi02SDZ6IiBmaWxsPSIjM0M0MDQzIi8+PC9zdmc+);
+}
+
+.offline-content-suggestion-texts {
+  display: flex;
+  flex-direction: column;
+  justify-content: space-between;
+  line-height: 1.3;
+  padding: .9em;
+  width: 100%;
+}
+
+.offline-content-suggestion-title {
+  -webkit-box-orient: vertical;
+  -webkit-line-clamp: 3;
+  color: rgb(32, 33, 36);
+  display: -webkit-box;
+  font-size: 1.1em;
+  overflow: hidden;
+  text-overflow: ellipsis;
+}
+
+div.offline-content-suggestion {
+  align-items: stretch;
+  border: 1px solid rgb(218, 220, 224);
+  border-radius: 8px;
+  display: flex;
+  justify-content: space-between;
+  margin-bottom: .8em;
+}
+
+.suggestion-with-image {
+  flex-direction: row;
+  height: 8.2em;
+  max-height: 8.2em;
+}
+
+.suggestion-with-icon {
+  flex-direction: row-reverse;
+  height: 4.2em;
+  max-height: 4.2em;
+}
+
+.suggestion-with-icon .offline-content-suggestion-title {
+  -webkit-line-clamp: 1;
+  word-break: break-all;
+}
+
+.suggestion-with-icon .offline-content-suggestion-texts {
+  padding-inline-start: 0;
+}
+
+.offline-content-suggestion-attribution-freshness {
+  color: rgb(95, 99, 104);
+  display: flex;
+  font-size: .8em;
+  line-height: 1.7em;
+}
+
+.offline-content-suggestion-attribution {
+  -webkit-box-orient: vertical;
+  -webkit-line-clamp: 1;
+  display: -webkit-box;
+  flex-shrink: 1;
+  margin-inline-end: 0.3em;
+  overflow: hidden;
+  overflow-wrap: break-word;
+  text-overflow: ellipsis;
+  word-break: break-all;
+}
+
+.no-attribution .offline-content-suggestion-attribution {
+  display: none;
+}
+
+.offline-content-suggestion-freshness::before {
+  content: '-';
+  display: inline-block;
+  flex-shrink: 0;
+  margin-inline-end: .1em;
+  margin-inline-start: .1em;
+}
+
+.no-attribution .offline-content-suggestion-freshness::before {
+  display: none;
+}
+
+.offline-content-suggestion-freshness {
+  flex-shrink: 0;
+}
+
+.suggestion-with-image .offline-content-suggestion-pin-spacer {
+  flex-grow: 100;
+  flex-shrink: 1;
+}
+
+.suggestion-with-image .offline-content-suggestion-pin {
+  content: url(data:image/svg+xml;base64,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);
+  flex-shrink: 0;
+  height: 1.4em;
+  margin-inline-start: .4em;
+  width: 1.4em;
+}
+
+/* Controls the animation (and a bit more) of the launch-downloads-home action
+ * button when the offline content list is expanded/shown.
+ */
+#offline-content-list-action {
+  text-align: center;
+  transition: visibility 0s 200ms, opacity 200ms 200ms linear;
+}
+
+/* Controls the animation of the launch-downloads-home action button when the
+ * offline content list is collapsed/hidden.
+ */
+#offline-content-list.list-hidden #offline-content-list-action {
+  opacity: 0;
+  transition: opacity 200ms linear, visibility 0s 200ms;
+  visibility: hidden;
+}
+
+#cancel-save-page-button {
+  background-image: url(data:image/svg+xml;base64,PHN2ZyB4bWxucz0iaHR0cDovL3d3dy53My5vcmcvMjAwMC9zdmciIHZpZXdCb3g9IjAgMCAyNCAyNCIgd2lkdGg9IjI0IiBoZWlnaHQ9IjI0Ij48Y2xpcFBhdGggaWQ9Im1hc2siPjxwYXRoIGQ9Ik0xMiAyQzYuNSAyIDIgNi41IDIgMTJzNC41IDEwIDEwIDEwIDEwLTQuNSAxMC0xMFMxNy41IDIgMTIgMnptNSAxNkg3di0yaDEwdjJ6bS02LjctNEw3IDEwLjdsMS40LTEuNCAxLjkgMS45IDUuMy01LjNMMTcgNy4zIDEwLjMgMTR6IiBmaWxsPSIjOUFBMEE2Ii8+PC9jbGlwUGF0aD48cGF0aCBjbGlwLXBhdGg9InVybCgjbWFzaykiIGZpbGw9IiM5QUEwQTYiIGQ9Ik0wIDBoMjR2MjRIMHoiLz48cGF0aCBjbGlwLXBhdGg9InVybCgjbWFzaykiIGZpbGw9IiMxQTczRTgiIHN0eWxlPSJhbmltYXRpb246b2ZmbGluZUFuaW1hdGlvbiA0cyBpbmZpbml0ZSIgZD0iTTAgMGgyNHYyNEgweiIvPjxzdHlsZT5Aa2V5ZnJhbWVzIG9mZmxpbmVBbmltYXRpb257MCUsMzUle2hlaWdodDowfTYwJXtoZWlnaHQ6MTAwJX05MCV7ZmlsbC1vcGFjaXR5OjF9dG97ZmlsbC1vcGFjaXR5OjB9fTwvc3R5bGU+PC9zdmc+);
+  background-position: right 27px center;
+  background-repeat: no-repeat;
+  border: 1px solid var(--google-gray-300);
+  border-radius: 5px;
+  color: var(--google-gray-700);
+  margin-bottom: 26px;
+  padding-bottom: 16px;
+  padding-inline-end: 88px;
+  padding-inline-start: 16px;
+  padding-top: 16px;
+  text-align: start;
+}
+
+html[dir='rtl'] #cancel-save-page-button {
+  background-position: left 27px center;
+}
+
+#save-page-for-later-button {
+  display: flex;
+  justify-content: start;
+}
+
+#save-page-for-later-button a::before {
+  content: url(data:image/svg+xml;base64,PHN2ZyB4bWxucz0iaHR0cDovL3d3dy53My5vcmcvMjAwMC9zdmciIHdpZHRoPSIxLjJlbSIgaGVpZ2h0PSIxLjJlbSIgdmlld0JveD0iMCAwIDI0IDI0Ij48cGF0aCBkPSJNNSAyMGgxNHYtMkg1bTE0LTloLTRWM0g5djZINWw3IDcgNy03eiIgZmlsbD0iIzQyODVGNCIvPjwvc3ZnPg==);
+  display: inline-block;
+  margin-inline-end: 4px;
+  vertical-align: -webkit-baseline-middle;
+}
+
+.hidden#save-page-for-later-button {
+  display: none;
+}
+
+/* Don't allow overflow when in a subframe. */
+html[subframe] body {
+  overflow: hidden;
+}
+
+#sub-frame-error {
+  -webkit-align-items: center;
+  -webkit-flex-flow: column;
+  -webkit-justify-content: center;
+  background-color: #DDD;
+  display: -webkit-flex;
+  height: 100%;
+  left: 0;
+  position: absolute;
+  text-align: center;
+  top: 0;
+  transition: background-color 200ms ease-in-out;
+  width: 100%;
+}
+
+#sub-frame-error:hover {
+  background-color: #EEE;
+}
+
+#sub-frame-error .icon-generic {
+  margin: 0 0 16px;
+}
+
+#sub-frame-error-details {
+  margin: 0 10px;
+  text-align: center;
+  visibility: hidden;
+}
+
+/* Show details only when hovering. */
+#sub-frame-error:hover #sub-frame-error-details {
+  visibility: visible;
+}
+
+/* If the iframe is too small, always hide the error code. */
+/* TODO(mmenke): See if overflow: no-display works better, once supported. */
+@media (max-width: 200px), (max-height: 95px) {
+  #sub-frame-error-details {
+    display: none;
+  }
+}
+
+/* Adjust icon for small embedded frames in apps. */
+@media (max-height: 100px) {
+  #sub-frame-error .icon-generic {
+    height: auto;
+    margin: 0;
+    padding-top: 0;
+    width: 25px;
+  }
+}
+
+/* details-button is special; it's a <button> element that looks like a link. */
+#details-button {
+  box-shadow: none;
+  min-width: 0;
+}
+
+/* Styles for platform dependent separation of controls and details button. */
+.suggested-left > #control-buttons,
+.suggested-right > #details-button {
+  float: left;
+}
+
+.suggested-right > #control-buttons,
+.suggested-left > #details-button {
+  float: right;
+}
+
+.suggested-left .secondary-button {
+  margin-inline-end: 0;
+  margin-inline-start: 16px;
+}
+
+#details-button.singular {
+  float: none;
+}
+
+/* download-button shows both icon and text. */
+#download-button {
+  padding-bottom: 4px;
+  padding-top: 4px;
+  position: relative;
+}
+
+#download-button::before {
+  background: image-set(
+      url(data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAABgAAAAYCAQAAABKfvVzAAAAO0lEQVQ4y2NgGArgPxIY1YChsOE/LtBAmpYG0mxpIOSDBpKUo2lpIDZxNJCkHKqlYZAla3RAHQ1DFgAARRroHyLNTwwAAAAASUVORK5CYII=) 1x,
+      url(data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAADAAAAAwCAQAAAD9CzEMAAAAZElEQVRYw+3Ruw3AMAwDUY3OzZUmRRD4E9iim9wNwAdbEURHyk4AAAAATiCVK8lLyPsKeT9K3lsownnunfkPxO78hKiYHxBV8x2icr5BVM+/CMf8g3DN34Rzns6ViwHUAUQ/6wIAd5Km7l6c8AAAAABJRU5ErkJggg==) 2x)
+    no-repeat;
+  content: '';
+  display: inline-block;
+  height: 24px;
+  margin-inline-end: 4px;
+  margin-inline-start: -4px;
+  vertical-align: middle;
+  width: 24px;
+}
+
+#download-button:disabled {
+  background: rgb(180, 206, 249);
+  color: rgb(255, 255, 255);
+}
+
+#buttons::after {
+  clear: both;
+  content: '';
+  display: block;
+  width: 100%;
+}
+
+/* Offline page */
+html[dir='rtl'] .runner-container,
+html[dir='rtl'].offline .icon-offline {
+  transform: scaleX(-1);
+}
+
+.offline {
+  transition: filter 1.5s cubic-bezier(0.65, 0.05, 0.36, 1),
+              background-color 1.5s cubic-bezier(0.65, 0.05, 0.36, 1);
+
+  will-change: filter, background-color;
+
+}
+
+.offline body {
+  transition: background-color 1.5s cubic-bezier(0.65, 0.05, 0.36, 1);
+}
+
+.offline #main-message > p {
+  display: none;
+}
+
+.offline.inverted {
+  background-color: #fff;
+  filter: invert(1);
+}
+
+.offline.inverted body {
+  background-color: #fff;
+}
+
+.offline .interstitial-wrapper {
+  color: var(--text-color);
+  font-size: 1em;
+  line-height: 1.55;
+  margin: 0 auto;
+  max-width: 600px;
+  padding-top: 100px;
+  position: relative;
+  width: 100%;
+}
+
+.offline .runner-container {
+  direction: ltr;
+  height: 150px;
+  max-width: 600px;
+  overflow: hidden;
+  position: absolute;
+  top: 35px;
+  width: 44px;
+}
+
+.offline .runner-container:focus {
+  outline: none;
+}
+
+.offline .runner-container:focus-visible {
+  outline: 3px solid var(--google-blue-300);
+}
+
+.offline .runner-canvas {
+  height: 150px;
+  max-width: 600px;
+  opacity: 1;
+  overflow: hidden;
+  position: absolute;
+  top: 0;
+  z-index: 10;
+}
+
+.offline .controller {
+  height: 100vh;
+  left: 0;
+  position: absolute;
+  top: 0;
+  width: 100vw;
+  z-index: 9;
+}
+
+#offline-resources {
+  display: none;
+}
+
+#offline-instruction {
+  image-rendering: pixelated;
+  left: 0;
+  margin: auto;
+  position: absolute;
+  right: 0;
+  top: 60px;
+  width: fit-content;
+}
+
+.offline-runner-live-region {
+  bottom: 0;
+  clip-path: polygon(0 0, 0 0, 0 0);
+  color: var(--background-color);
+  display: block;
+  font-size: xx-small;
+  overflow: hidden;
+  position: absolute;
+  text-align: center;
+  transition: color 1.5s cubic-bezier(0.65, 0.05, 0.36, 1);
+  user-select: none;
+}
+
+/* Custom toggle */
+.slow-speed-option {
+  align-items: center;
+  background: var(--google-gray-50);
+  border-radius: 24px/50%;
+  bottom: 0;
+  color: var(--error-code-color);
+  display: inline-flex;
+  font-size: 1em;
+  left: 0;
+  line-height: 1.1em;
+  margin: 5px auto;
+  padding: 2px 12px 3px 20px;
+  position: absolute;
+  right: 0;
+  width: max-content;
+  z-index: 999;
+}
+
+.slow-speed-option.hidden {
+  display: none;
+}
+
+.slow-speed-option [type=checkbox] {
+  opacity: 0;
+  pointer-events: none;
+  position: absolute;
+}
+
+.slow-speed-option .slow-speed-toggle {
+  cursor: pointer;
+  margin-inline-start: 8px;
+  padding: 8px 4px;
+  position: relative;
+}
+
+.slow-speed-option [type=checkbox]:disabled ~ .slow-speed-toggle {
+  cursor: default;
+}
+
+.slow-speed-option-label [type=checkbox] {
+  opacity: 0;
+  pointer-events: none;
+  position: absolute;
+}
+
+.slow-speed-option .slow-speed-toggle::before,
+.slow-speed-option .slow-speed-toggle::after {
+  content: '';
+  display: block;
+  margin: 0 3px;
+  transition: all 100ms cubic-bezier(0.4, 0, 1, 1);
+}
+
+.slow-speed-option .slow-speed-toggle::before {
+  background: rgb(189,193,198);
+  border-radius: 0.65em;
+  height: 0.9em;
+  width: 2em;
+}
+
+.slow-speed-option .slow-speed-toggle::after {
+  background: #fff;
+  border-radius: 50%;
+  box-shadow: 0 1px 3px 0 rgb(0 0 0 / 40%);
+  height: 1.2em;
+  position: absolute;
+  top: 51%;
+  transform: translate(-20%, -50%);
+  width: 1.1em;
+}
+
+.slow-speed-option [type=checkbox]:focus + .slow-speed-toggle {
+  box-shadow: 0 0 8px rgb(94, 158, 214);
+  outline: 1px solid rgb(93, 157, 213);
+}
+
+.slow-speed-option [type=checkbox]:checked + .slow-speed-toggle::before {
+  background: var(--google-blue-600);
+  opacity: 0.5;
+}
+
+.slow-speed-option [type=checkbox]:checked + .slow-speed-toggle::after {
+  background: var(--google-blue-600);
+  transform: translate(calc(2em - 90%), -50%);
+}
+
+.slow-speed-option [type=checkbox]:checked:disabled +
+  .slow-speed-toggle::before {
+  background: rgb(189,193,198);
+}
+
+.slow-speed-option [type=checkbox]:checked:disabled +
+  .slow-speed-toggle::after {
+  background: var(--google-gray-50);
+}
+
+@media (max-width: 420px) {
+  #download-button {
+    padding-bottom: 12px;
+    padding-top: 12px;
+  }
+
+  .suggested-left > #control-buttons,
+  .suggested-right > #control-buttons {
+    float: none;
+  }
+
+  .snackbar {
+    border-radius: 0;
+    bottom: 0;
+    left: 0;
+    width: 100%;
+  }
+}
+
+@media (max-height: 350px) {
+  h1 {
+    margin: 0 0 15px;
+  }
+
+  .icon-offline {
+    margin: 0 0 10px;
+  }
+
+  .interstitial-wrapper {
+    margin-top: 5%;
+  }
+
+  .nav-wrapper {
+    margin-top: 30px;
+  }
+}
+
+@media (min-width: 420px) and (max-width: 736px) and
+       (min-height: 240px) and (max-height: 420px) and
+       (orientation:landscape) {
+  .interstitial-wrapper {
+    margin-bottom: 100px;
+  }
+}
+
+@media (max-width: 360px) and (max-height: 480px) {
+  .offline .interstitial-wrapper {
+    padding-top: 60px;
+  }
+
+  .offline .runner-container {
+    top: 8px;
+  }
+}
+
+@media (min-height: 240px) and (orientation: landscape) {
+  .offline .interstitial-wrapper {
+    margin-bottom: 90px;
+  }
+
+  .icon-offline {
+    margin-bottom: 20px;
+  }
+}
+
+@media (max-height: 320px) and (orientation: landscape) {
+  .icon-offline {
+    margin-bottom: 0;
+  }
+
+  .offline .runner-container {
+    top: 10px;
+  }
+}
+
+@media (max-width: 240px) {
+  button {
+    padding-inline-end: 12px;
+    padding-inline-start: 12px;
+  }
+
+  .interstitial-wrapper {
+    overflow: inherit;
+    padding: 0 8px;
+  }
+}
+
+@media (max-width: 120px) {
+  button {
+    width: auto;
+  }
+}
+
+.arcade-mode,
+.arcade-mode .runner-container,
+.arcade-mode .runner-canvas {
+  image-rendering: pixelated;
+  max-width: 100%;
+  overflow: hidden;
+}
+
+.arcade-mode #buttons,
+.arcade-mode #main-content {
+  opacity: 0;
+  overflow: hidden;
+}
+
+.arcade-mode .interstitial-wrapper {
+  height: 100vh;
+  max-width: 100%;
+  overflow: hidden;
+}
+
+.arcade-mode .runner-container {
+  left: 0;
+  margin: auto;
+  right: 0;
+  transform-origin: top center;
+  transition: transform 250ms cubic-bezier(0.4, 0, 1, 1) 400ms;
+  z-index: 2;
+}
+
+@media (prefers-color-scheme: dark) {
+  .icon {
+    filter: invert(1);
+  }
+
+  .offline .runner-canvas {
+    filter: invert(1);
+  }
+
+  .offline.inverted {
+    background-color: var(--background-color);
+    filter: invert(0);
+  }
+
+  .offline.inverted body {
+    background-color: #fff;
+  }
+
+  .offline.inverted .offline-runner-live-region {
+    color: #fff;
+  }
+
+  #suggestions-list a {
+    color: var(--link-color);
+  }
+
+  #error-information-button {
+    filter: invert(0.6);
+  }
+
+  .slow-speed-option {
+    background: var(--google-gray-800);
+    color: var(--google-gray-100);
+  }
+
+  .slow-speed-option .slow-speed-toggle::before,
+  .slow-speed-option [type=checkbox]:checked:disabled +
+    .slow-speed-toggle::before {
+     background: rgb(189,193,198);
+  }
+
+  .slow-speed-option [type=checkbox]:checked + .slow-speed-toggle::after,
+  .slow-speed-option [type=checkbox]:checked + .slow-speed-toggle::before {
+    background: var(--google-blue-300);
+  }
+}
+</style>
+  <script>(function(){function l(a,b,c){return Function.prototype.call.apply(Array.prototype.slice,arguments)}function m(a,b,c){var e=l(arguments,2);return function(){return b.apply(a,e)}}function n(a,b){var c=new p(b);for(c.h=[a];c.h.length;){var e=c,d=c.h.shift();e.i(d);for(d=d.firstChild;d;d=d.nextSibling)1==d.nodeType&&e.h.push(d);}}function p(a){this.i=a;}function q(a){a.style.display="";}function r(a){a.style.display="none";}var t=/\s*;\s*/;function u(a,b){this.l.apply(this,arguments);}u.prototype.l=function(a,b){this.a||(this.a={});if(b){var c=this.a,e=b.a;for(d in e)c[d]=e[d];}else {var d=this.a;e=v;for(c in e)d[c]=e[c];}this.a.$this=a;this.a.$context=this;this.f="undefined"!=typeof a&&null!=a?a:"";b||(this.a.$top=this.f);};var v={$default:null},w=[];function x(a){for(var b in a.a)delete a.a[b];a.f=null;w.push(a);}function y(a,b,c){try{return b.call(c,a.a,a.f)}catch(e){return v.$default}}
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+function S(a,b){var c=document;if(b){var e=c.getElementById(a);if(!e){e=b();var d=c.getElementById("jsts");d||(d=c.createElement("div"),d.id="jsts",r(d),d.style.position="absolute",c.body.appendChild(d));var g=c.createElement("div");d.appendChild(g);g.innerHTML=e;e=c.getElementById(a);}c=e;}else c=c.getElementById(a);return c?(L(c),c=c.cloneNode(!0),c.removeAttribute("id"),c):null}function T(a,b,c){c==b.length-1?a.setAttribute("jsinstance","*"+c):a.setAttribute("jsinstance",""+c);}window.jstGetTemplate=S;window.JsEvalContext=u;window.jstProcess=function(a,b){var c=new F;L(b);c.m=b?9==b.nodeType?b:b.ownerDocument||document:document;var e=m(c,c.g,a,b),d=c.j=[],g=c.o=[];c.c=[];e();for(var h,f,k;d.length;)h=d[d.length-1],e=g[g.length-1],e>=h.length?(e=c,f=d.pop(),f.length=0,e.c.push(f),g.pop()):(f=h[e++],k=h[e++],h=h[e++],g[g.length-1]=e,f.call(c,k,h));};
+})();
+
+// Copyright 2017 The Chromium Authors
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+
+const HIDDEN_CLASS$1 = 'hidden';
+
+// 
+
+//
+
+// Copyright 2015 The Chromium Authors
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+
+let mobileNav = false;
+
+/**
+ * For small screen mobile the navigation buttons are moved
+ * below the advanced text.
+ */
+function onResize() {
+  const helpOuterBox = document.querySelector('#details');
+  const mainContent = document.querySelector('#main-content');
+  const mediaQuery = '(min-width: 240px) and (max-width: 420px) and ' +
+      '(min-height: 401px), ' +
+      '(max-height: 560px) and (min-height: 240px) and ' +
+      '(min-width: 421px)';
+
+  const detailsHidden = helpOuterBox.classList.contains(HIDDEN_CLASS$1);
+  const runnerContainer = document.querySelector('.runner-container');
+
+  // Check for change in nav status.
+  if (mobileNav !== window.matchMedia(mediaQuery).matches) {
+    mobileNav = !mobileNav;
+
+    // Handle showing the top content / details sections according to state.
+    if (mobileNav) {
+      mainContent.classList.toggle(HIDDEN_CLASS$1, !detailsHidden);
+      helpOuterBox.classList.toggle(HIDDEN_CLASS$1, detailsHidden);
+      if (runnerContainer) {
+        runnerContainer.classList.toggle(HIDDEN_CLASS$1, !detailsHidden);
+      }
+    } else if (!detailsHidden) {
+      // Non mobile nav with visible details.
+      mainContent.classList.remove(HIDDEN_CLASS$1);
+      helpOuterBox.classList.remove(HIDDEN_CLASS$1);
+      if (runnerContainer) {
+        runnerContainer.classList.remove(HIDDEN_CLASS$1);
+      }
+    }
+  }
+}
+
+function setupMobileNav() {
+  window.addEventListener('resize', onResize);
+  onResize();
+}
+
+document.addEventListener('DOMContentLoaded', setupMobileNav);
+
+// Copyright 2022 The Chromium Authors
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+/**
+ * Verify |value| is truthy.
+ * @param value A value to check for truthiness. Note that this
+ *     may be used to test whether |value| is defined or not, and we don't want
+ *     to force a cast to boolean.
+ */
+function assert(value, message) {
+    if (value) {
+        return;
+    }
+    throw new Error('Assertion failed' + (message ? `: ${message}` : ''));
+}
+
+// Copyright 2022 The Chromium Authors
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+/**
+ * @fileoverview This file defines a singleton which provides access to all data
+ * that is available as soon as the page's resources are loaded (before DOM
+ * content has finished loading). This data includes both localized strings and
+ * any data that is important to have ready from a very early stage (e.g. things
+ * that must be displayed right away).
+ *
+ * Note that loadTimeData is not guaranteed to be consistent between page
+ * refreshes (https://crbug.com/740629) and should not contain values that might
+ * change if the page is re-opened later.
+ */
+class LoadTimeData {
+    data_ = null;
+    /**
+     * Sets the backing object.
+     *
+     * Note that there is no getter for |data_| to discourage abuse of the form:
+     *
+     *     var value = loadTimeData.data()['key'];
+     */
+    set data(value) {
+        assert(!this.data_, 'Re-setting data.');
+        this.data_ = value;
+    }
+    /**
+     * @param id An ID of a value that might exist.
+     * @return True if |id| is a key in the dictionary.
+     */
+    valueExists(id) {
+        assert(this.data_, 'No data. Did you remember to include strings.js?');
+        return id in this.data_;
+    }
+    /**
+     * Fetches a value, expecting that it exists.
+     * @param id The key that identifies the desired value.
+     * @return The corresponding value.
+     */
+    getValue(id) {
+        assert(this.data_, 'No data. Did you remember to include strings.js?');
+        const value = this.data_[id];
+        assert(typeof value !== 'undefined', 'Could not find value for ' + id);
+        return value;
+    }
+    /**
+     * As above, but also makes sure that the value is a string.
+     * @param id The key that identifies the desired string.
+     * @return The corresponding string value.
+     */
+    getString(id) {
+        const value = this.getValue(id);
+        assert(typeof value === 'string', `[${value}] (${id}) is not a string`);
+        return value;
+    }
+    /**
+     * Returns a formatted localized string where $1 to $9 are replaced by the
+     * second to the tenth argument.
+     * @param id The ID of the string we want.
+     * @param args The extra values to include in the formatted output.
+     * @return The formatted string.
+     */
+    getStringF(id, ...args) {
+        const value = this.getString(id);
+        if (!value) {
+            return '';
+        }
+        return this.substituteString(value, ...args);
+    }
+    /**
+     * Returns a formatted localized string where $1 to $9 are replaced by the
+     * second to the tenth argument. Any standalone $ signs must be escaped as
+     * $$.
+     * @param label The label to substitute through. This is not an resource ID.
+     * @param args The extra values to include in the formatted output.
+     * @return The formatted string.
+     */
+    substituteString(label, ...args) {
+        return label.replace(/\$(.|$|\n)/g, function (m) {
+            assert(m.match(/\$[$1-9]/), 'Unescaped $ found in localized string.');
+            if (m === '$$') {
+                return '$';
+            }
+            const substitute = args[Number(m[1]) - 1];
+            if (substitute === undefined || substitute === null) {
+                // Not all callers actually provide values for all substitutes. Return
+                // an empty value for this case.
+                return '';
+            }
+            return substitute.toString();
+        });
+    }
+    /**
+     * Returns a formatted string where $1 to $9 are replaced by the second to
+     * tenth argument, split apart into a list of pieces describing how the
+     * substitution was performed. Any standalone $ signs must be escaped as $$.
+     * @param label A localized string to substitute through.
+     *     This is not an resource ID.
+     * @param args The extra values to include in the formatted output.
+     * @return The formatted string pieces.
+     */
+    getSubstitutedStringPieces(label, ...args) {
+        // Split the string by separately matching all occurrences of $1-9 and of
+        // non $1-9 pieces.
+        const pieces = (label.match(/(\$[1-9])|(([^$]|\$([^1-9]|$))+)/g) ||
+            []).map(function (p) {
+            // Pieces that are not $1-9 should be returned after replacing $$
+            // with $.
+            if (!p.match(/^\$[1-9]$/)) {
+                assert((p.match(/\$/g) || []).length % 2 === 0, 'Unescaped $ found in localized string.');
+                return { value: p.replace(/\$\$/g, '$'), arg: null };
+            }
+            // Otherwise, return the substitution value.
+            const substitute = args[Number(p[1]) - 1];
+            if (substitute === undefined || substitute === null) {
+                // Not all callers actually provide values for all substitutes. Return
+                // an empty value for this case.
+                return { value: '', arg: p };
+            }
+            return { value: substitute.toString(), arg: p };
+        });
+        return pieces;
+    }
+    /**
+     * As above, but also makes sure that the value is a boolean.
+     * @param id The key that identifies the desired boolean.
+     * @return The corresponding boolean value.
+     */
+    getBoolean(id) {
+        const value = this.getValue(id);
+        assert(typeof value === 'boolean', `[${value}] (${id}) is not a boolean`);
+        return value;
+    }
+    /**
+     * As above, but also makes sure that the value is an integer.
+     * @param id The key that identifies the desired number.
+     * @return The corresponding number value.
+     */
+    getInteger(id) {
+        const value = this.getValue(id);
+        assert(typeof value === 'number', `[${value}] (${id}) is not a number`);
+        assert(value === Math.floor(value), 'Number isn\'t integer: ' + value);
+        return value;
+    }
+    /**
+     * Override values in loadTimeData with the values found in |replacements|.
+     * @param replacements The dictionary object of keys to replace.
+     */
+    overrideValues(replacements) {
+        assert(typeof replacements === 'object', 'Replacements must be a dictionary object.');
+        assert(this.data_, 'Data must exist before being overridden');
+        for (const key in replacements) {
+            this.data_[key] = replacements[key];
+        }
+    }
+    /**
+     * Reset loadTimeData's data. Should only be used in tests.
+     * @param newData The data to restore to, when null restores to unset state.
+     */
+    resetForTesting(newData = null) {
+        this.data_ = newData;
+    }
+    /**
+     * @return Whether loadTimeData.data has been set.
+     */
+    isInitialized() {
+        return this.data_ !== null;
+    }
+}
+const loadTimeData = new LoadTimeData();
+
+// Copyright 2023 The Chromium Authors
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+const HIDDEN_CLASS = 'hidden';
+
+// Copyright 2021 The Chromium Authors
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+/* @const
+ * Add matching sprite definition and config to spriteDefinitionByType.
+ */
+const GAME_TYPE = ['altgame'];
+
+//******************************************************************************
+
+/**
+ * Collision box object.
+ * @param {number} x X position.
+ * @param {number} y Y Position.
+ * @param {number} w Width.
+ * @param {number} h Height.
+ * @constructor
+ */
+function CollisionBox(x, y, w, h) {
+  this.x = x;
+  this.y = y;
+  this.width = w;
+  this.height = h;
+}
+
+/**
+ * T-Rex runner sprite definitions.
+ */
+const spriteDefinitionByType = {
+  original: {
+    LDPI: {
+      BACKGROUND_EL: {x: 86, y: 2},
+      CACTUS_LARGE: {x: 332, y: 2},
+      CACTUS_SMALL: {x: 228, y: 2},
+      OBSTACLE_2: {x: 332, y: 2},
+      OBSTACLE: {x: 228, y: 2},
+      CLOUD: {x: 86, y: 2},
+      HORIZON: {x: 2, y: 54},
+      MOON: {x: 484, y: 2},
+      PTERODACTYL: {x: 134, y: 2},
+      RESTART: {x: 2, y: 68},
+      TEXT_SPRITE: {x: 655, y: 2},
+      TREX: {x: 848, y: 2},
+      STAR: {x: 645, y: 2},
+      COLLECTABLE: {x: 0, y: 0},
+      ALT_GAME_END: {x: 32, y: 0},
+    },
+    HDPI: {
+      BACKGROUND_EL: {x: 166, y: 2},
+      CACTUS_LARGE: {x: 652, y: 2},
+      CACTUS_SMALL: {x: 446, y: 2},
+      OBSTACLE_2: {x: 652, y: 2},
+      OBSTACLE: {x: 446, y: 2},
+      CLOUD: {x: 166, y: 2},
+      HORIZON: {x: 2, y: 104},
+      MOON: {x: 954, y: 2},
+      PTERODACTYL: {x: 260, y: 2},
+      RESTART: {x: 2, y: 130},
+      TEXT_SPRITE: {x: 1294, y: 2},
+      TREX: {x: 1678, y: 2},
+      STAR: {x: 1276, y: 2},
+      COLLECTABLE: {x: 0, y: 0},
+      ALT_GAME_END: {x: 64, y: 0},
+    },
+    MAX_GAP_COEFFICIENT: 1.5,
+    MAX_OBSTACLE_LENGTH: 3,
+    HAS_CLOUDS: 1,
+    BOTTOM_PAD: 10,
+    TREX: {
+      WAITING_1: {x: 44, w: 44, h: 47, xOffset: 0},
+      WAITING_2: {x: 0, w: 44, h: 47, xOffset: 0},
+      RUNNING_1: {x: 88, w: 44, h: 47, xOffset: 0},
+      RUNNING_2: {x: 132, w: 44, h: 47, xOffset: 0},
+      JUMPING: {x: 0, w: 44, h: 47, xOffset: 0},
+      CRASHED: {x: 220, w: 44, h: 47, xOffset: 0},
+      COLLISION_BOXES: [
+        new CollisionBox(22, 0, 17, 16),
+        new CollisionBox(1, 18, 30, 9),
+        new CollisionBox(10, 35, 14, 8),
+        new CollisionBox(1, 24, 29, 5),
+        new CollisionBox(5, 30, 21, 4),
+        new CollisionBox(9, 34, 15, 4),
+      ],
+    },
+    /** @type {Array<ObstacleType>} */
+    OBSTACLES: [
+      {
+        type: 'CACTUS_SMALL',
+        width: 17,
+        height: 35,
+        yPos: 105,
+        multipleSpeed: 4,
+        minGap: 120,
+        minSpeed: 0,
+        collisionBoxes: [
+          new CollisionBox(0, 7, 5, 27),
+          new CollisionBox(4, 0, 6, 34),
+          new CollisionBox(10, 4, 7, 14),
+        ],
+      },
+      {
+        type: 'CACTUS_LARGE',
+        width: 25,
+        height: 50,
+        yPos: 90,
+        multipleSpeed: 7,
+        minGap: 120,
+        minSpeed: 0,
+        collisionBoxes: [
+          new CollisionBox(0, 12, 7, 38),
+          new CollisionBox(8, 0, 7, 49),
+          new CollisionBox(13, 10, 10, 38),
+        ],
+      },
+      {
+        type: 'PTERODACTYL',
+        width: 46,
+        height: 40,
+        yPos: [100, 75, 50],    // Variable height.
+        yPosMobile: [100, 50],  // Variable height mobile.
+        multipleSpeed: 999,
+        minSpeed: 8.5,
+        minGap: 150,
+        collisionBoxes: [
+          new CollisionBox(15, 15, 16, 5),
+          new CollisionBox(18, 21, 24, 6),
+          new CollisionBox(2, 14, 4, 3),
+          new CollisionBox(6, 10, 4, 7),
+          new CollisionBox(10, 8, 6, 9),
+        ],
+        numFrames: 2,
+        frameRate: 1000 / 6,
+        speedOffset: .8,
+      },
+      {
+        type: 'COLLECTABLE',
+        width: 31,
+        height: 24,
+        yPos: 104,
+        multipleSpeed: 1000,
+        minGap: 9999,
+        minSpeed: 0,
+        collisionBoxes: [
+          new CollisionBox(0, 0, 32, 25),
+        ],
+      },
+    ],
+    BACKGROUND_EL: {
+      'CLOUD': {
+        HEIGHT: 14,
+        MAX_CLOUD_GAP: 400,
+        MAX_SKY_LEVEL: 30,
+        MIN_CLOUD_GAP: 100,
+        MIN_SKY_LEVEL: 71,
+        OFFSET: 4,
+        WIDTH: 46,
+        X_POS: 1,
+        Y_POS: 120,
+      },
+    },
+    BACKGROUND_EL_CONFIG: {
+      MAX_BG_ELS: 1,
+      MAX_GAP: 400,
+      MIN_GAP: 100,
+      POS: 0,
+      SPEED: 0.5,
+      Y_POS: 125,
+    },
+    LINES: [
+      {SOURCE_X: 2, SOURCE_Y: 52, WIDTH: 600, HEIGHT: 12, YPOS: 127},
+    ],
+    ALT_GAME_OVER_TEXT_CONFIG: {
+      TEXT_X: 32,
+      TEXT_Y: 0,
+      TEXT_WIDTH: 246,
+      TEXT_HEIGHT: 17,
+      FLASH_DURATION: 1500,
+      FLASHING: false,
+    },
+  },
+  altgame: {
+    LDPI: {
+      BACKGROUND_EL: {x: 260, y: 19},
+      OBSTACLE1: {x: 152, y: 65},
+      OBSTACLE2: {x: 188, y: 65},
+      OBSTACLE3: {x: 152, y: 65},
+      OBSTACLE4: {x: 188, y: 65},
+      OBSTACLE5: {x: 0, y: 60},
+      OBSTACLE6: {x: 42, y: 58},
+      OBSTACLE7: {x: 98, y: 58},
+      OBSTACLE8: {x: 96, y: 19},
+      HORIZON: {x: 0, y: 3},
+      TREX: {x: 557, y: 63},
+      COLLECTABLE: {x: 193, y: 19},
+    },
+    HDPI: {
+      BACKGROUND_EL: {x: 520, y: 38},
+      OBSTACLE1: {x: 304, y: 130},
+      OBSTACLE2: {x: 376, y: 130},
+      OBSTACLE3: {x: 304, y: 130},
+      OBSTACLE4: {x: 376, y: 130},
+      OBSTACLE5: {x: 0, y: 120},
+      OBSTACLE6: {x: 84, y: 116},
+      OBSTACLE7: {x: 196, y: 116},
+      OBSTACLE8: {x: 192, y: 38},
+      HORIZON: {x: 0, y: 6},
+      TREX: {x: 1114, y: 126},
+      COLLECTABLE: {x: 386, y: 38},
+    },
+    MAX_GAP_COEFFICIENT: 1.5,
+    MAX_OBSTACLE_LENGTH: 2,
+    HAS_CLOUDS: 0,
+    BOTTOM_PAD: 10,
+    TREX: {
+      MAX_JUMP_HEIGHT: 50,
+      MIN_JUMP_HEIGHT: 40,
+      INITIAL_JUMP_VELOCITY: -10,
+      RUNNING_1: {x: 96, w: 49, h: 47, xOffset: 0},
+      RUNNING_2: {x: 145, w: 49, h: 47, xOffset: 0},
+      JUMPING: {x: 47, w: 49, h: 47, xOffset: 0},
+      CRASHED: {x: 194, w: 62, h: 47, xOffset: 0},
+      DUCKING_1: {x: 257, w: 55, h: 26, xOffset: 0},
+      DUCKING_2: {x: 316, w: 55, h: 26, xOffset: 0},
+      COLLISION_BOXES: [
+        new CollisionBox(22, 0, 17, 16),
+        new CollisionBox(1, 18, 30, 9),
+        new CollisionBox(10, 35, 14, 8),
+        new CollisionBox(1, 24, 29, 5),
+        new CollisionBox(5, 30, 21, 4),
+        new CollisionBox(9, 34, 15, 4),
+      ],
+    },
+    /** @type {Array<ObstacleType>} */
+    OBSTACLES: [
+      {
+        type: 'OBSTACLE1',
+        width: 36,
+        height: 45,
+        yPos: 95,
+        multipleSpeed: 999,
+        minGap: 120,
+        minSpeed: 0,
+        collisionBoxes: [
+          new CollisionBox(0, 17, 8, 28),
+          new CollisionBox(6, 3, 24, 42),
+          new CollisionBox(28, 17, 8, 28),
+        ],
+      },
+      {
+        type: 'OBSTACLE2',
+        width: 36,
+        height: 45,
+        yPos: 95,
+        multipleSpeed: 999,
+        minGap: 120,
+        minSpeed: 0,
+        collisionBoxes: [
+          new CollisionBox(0, 17, 8, 28),
+          new CollisionBox(6, 3, 24, 42),
+          new CollisionBox(28, 17, 8, 28),
+        ],
+      },
+      {
+        type: 'OBSTACLE3',
+        width: 72,
+        height: 45,
+        yPos: 95,
+        multipleSpeed: 999,
+        minGap: 120,
+        minSpeed: 8,
+        collisionBoxes: [
+          new CollisionBox(0, 17, 8, 28),
+          new CollisionBox(6, 3, 24, 42),
+          new CollisionBox(28, 17, 8, 28),
+          new CollisionBox(36, 17, 8, 28),
+          new CollisionBox(42, 3, 24, 42),
+          new CollisionBox(64, 17, 8, 28),
+        ],
+      },
+      {
+        type: 'OBSTACLE4',
+        width: 72,
+        height: 45,
+        yPos: 95,
+        multipleSpeed: 999,
+        minGap: 120,
+        minSpeed: 8,
+        collisionBoxes: [
+          new CollisionBox(0, 17, 8, 28),
+          new CollisionBox(6, 3, 24, 42),
+          new CollisionBox(28, 17, 8, 28),
+          new CollisionBox(36, 17, 8, 28),
+          new CollisionBox(42, 3, 24, 42),
+          new CollisionBox(64, 17, 8, 28),
+        ],
+      },
+      {
+        type: 'OBSTACLE5',
+        width: 42,
+        height: 50,
+        yPos: 95,
+        multipleSpeed: 999,
+        minGap: 120,
+        minSpeed: 5,
+        collisionBoxes: [
+          new CollisionBox(0, 0, 42, 50),
+        ],
+      },
+      {
+        type: 'OBSTACLE6',
+        width: 56,
+        height: 52,
+        yPos: 93,
+        multipleSpeed: 999,
+        minGap: 120,
+        minSpeed: 7,
+        collisionBoxes: [
+          new CollisionBox(0, 11, 8, 40),
+          new CollisionBox(8, 0, 19, 51),
+          new CollisionBox(27, 11, 28, 40),
+        ],
+      },
+      {
+        type: 'OBSTACLE7',
+        width: 54,
+        height: 52,
+        yPos: 93,
+        multipleSpeed: 999,
+        minGap: 120,
+        minSpeed: 6,
+        collisionBoxes: [
+          new CollisionBox(0, 11, 19, 40),
+          new CollisionBox(19, 0, 19, 51),
+          new CollisionBox(38, 14, 15, 37),
+        ],
+      },
+      {
+        type: 'OBSTACLE8',
+        width: 49,
+        height: 20,
+        yPos: [100, 75, 50],    // Variable height.
+        yPosMobile: [100, 50],  // Variable height mobile.
+        multipleSpeed: 999,
+        minSpeed: 8.5,
+        minGap: 150,
+        collisionBoxes: [
+          new CollisionBox(15, 15, 16, 5),
+          new CollisionBox(18, 21, 24, 6),
+          new CollisionBox(2, 14, 4, 3),
+          new CollisionBox(6, 10, 4, 7),
+          new CollisionBox(10, 8, 6, 9),
+        ],
+        numFrames: 2,
+        frameRate: 1000 / 6,
+        speedOffset: .8,
+      },
+    ],
+    BACKGROUND_EL: {
+      'GROUP1': {
+        HEIGHT: 91,
+        MAX_CLOUD_GAP: 600,
+        MAX_SKY_LEVEL: 0,
+        MIN_CLOUD_GAP: 300,
+        MIN_SKY_LEVEL: 0,
+        OFFSET: 11,
+        WIDTH: 131,
+        X_POS: 260,
+      },
+      'GROUP2': {
+        HEIGHT: 91,
+        MAX_CLOUD_GAP: 600,
+        MAX_SKY_LEVEL: 0,
+        MIN_CLOUD_GAP: 300,
+        MIN_SKY_LEVEL: 0,
+        OFFSET: 11,
+        WIDTH: 166,
+        X_POS: 391,
+      },
+    },
+    BACKGROUND_EL_CONFIG: {
+      MAX_BG_ELS: 8,
+      MAX_GAP: 600,
+      MIN_GAP: 300,
+      POS: 0,
+      SPEED: 0.8,
+      Y_POS: 122,
+    },
+    LINES: [
+      {SOURCE_X: 2, SOURCE_Y: 3, WIDTH: 600, HEIGHT: 12, YPOS: 128},
+    ],
+  },
+};
+
+// Copyright 2014 The Chromium Authors
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+
+/**
+ * T-Rex runner.
+ * @param {string} outerContainerId Outer containing element id.
+ * @param {!Object=} opt_config
+ * @constructor
+ * @implements {EventListener}
+ * @export
+ */
+function Runner(outerContainerId, opt_config) {
+  // Singleton
+  if (Runner.instance_) {
+    return Runner.instance_;
+  }
+  Runner.instance_ = this;
+
+  this.outerContainerEl = document.querySelector(outerContainerId);
+  this.containerEl = null;
+  this.snackbarEl = null;
+  // A div to intercept touch events. Only set while (playing && useTouch).
+  this.touchController = null;
+
+  this.config = opt_config || Object.assign(Runner.config, Runner.normalConfig);
+  // Logical dimensions of the container.
+  this.dimensions = Runner.defaultDimensions;
+
+  this.gameType = null;
+  Runner.spriteDefinition = spriteDefinitionByType['original'];
+
+  this.altGameImageSprite = null;
+  this.altGameModeActive = false;
+  this.altGameModeFlashTimer = null;
+  this.fadeInTimer = 0;
+
+  this.canvas = null;
+  this.canvasCtx = null;
+
+  this.tRex = null;
+
+  this.distanceMeter = null;
+  this.distanceRan = 0;
+
+  this.highestScore = 0;
+  this.syncHighestScore = false;
+
+  this.time = 0;
+  this.runningTime = 0;
+  this.msPerFrame = 1000 / FPS;
+  this.currentSpeed = this.config.SPEED;
+  Runner.slowDown = false;
+
+  this.obstacles = [];
+
+  this.activated = false; // Whether the easter egg has been activated.
+  this.playing = false; // Whether the game is currently in play state.
+  this.crashed = false;
+  this.paused = false;
+  this.inverted = false;
+  this.invertTimer = 0;
+  this.resizeTimerId_ = null;
+
+  this.playCount = 0;
+
+  // Sound FX.
+  this.audioBuffer = null;
+
+  /** @type {Object} */
+  this.soundFx = {};
+  this.generatedSoundFx = null;
+
+  // Global web audio context for playing sounds.
+  this.audioContext = null;
+
+  // Images.
+  this.images = {};
+  this.imagesLoaded = 0;
+
+  // Gamepad state.
+  this.pollingGamepads = false;
+  this.gamepadIndex = undefined;
+  this.previousGamepad = null;
+
+  if (this.isDisabled()) {
+    this.setupDisabledRunner();
+  } else {
+    if (Runner.isAltGameModeEnabled()) {
+      this.initAltGameType();
+      Runner.gameType = this.gameType;
+    }
+    this.loadImages();
+
+    window['initializeEasterEggHighScore'] =
+        this.initializeHighScore.bind(this);
+  }
+}
+
+/**
+ * Default game width.
+ * @const
+ */
+const DEFAULT_WIDTH = 600;
+
+/**
+ * Frames per second.
+ * @const
+ */
+const FPS = 60;
+
+/** @const */
+const IS_HIDPI = window.devicePixelRatio > 1;
+
+/** @const */
+const IS_IOS = /CriOS/.test(window.navigator.userAgent);
+
+/** @const */
+const IS_MOBILE = /Android/.test(window.navigator.userAgent) || IS_IOS;
+
+/** @const */
+const IS_RTL = document.querySelector('html').dir == 'rtl';
+
+/** @const */
+const ARCADE_MODE_URL = 'chrome://dino/';
+
+/** @const */
+const RESOURCE_POSTFIX = 'offline-resources-';
+
+/** @const */
+const A11Y_STRINGS = {
+  ariaLabel: 'dinoGameA11yAriaLabel',
+  description: 'dinoGameA11yDescription',
+  gameOver: 'dinoGameA11yGameOver',
+  highScore: 'dinoGameA11yHighScore',
+  jump: 'dinoGameA11yJump',
+  started: 'dinoGameA11yStartGame',
+  speedLabel: 'dinoGameA11ySpeedToggle',
+};
+
+/**
+ * Default game configuration.
+ * Shared config for all  versions of the game. Additional parameters are
+ * defined in Runner.normalConfig and Runner.slowConfig.
+ */
+Runner.config = {
+  AUDIOCUE_PROXIMITY_THRESHOLD: 190,
+  AUDIOCUE_PROXIMITY_THRESHOLD_MOBILE_A11Y: 250,
+  BG_CLOUD_SPEED: 0.2,
+  BOTTOM_PAD: 10,
+  // Scroll Y threshold at which the game can be activated.
+  CANVAS_IN_VIEW_OFFSET: -10,
+  CLEAR_TIME: 3000,
+  CLOUD_FREQUENCY: 0.5,
+  FADE_DURATION: 1,
+  FLASH_DURATION: 1000,
+  GAMEOVER_CLEAR_TIME: 1200,
+  INITIAL_JUMP_VELOCITY: 12,
+  INVERT_FADE_DURATION: 12000,
+  MAX_BLINK_COUNT: 3,
+  MAX_CLOUDS: 6,
+  MAX_OBSTACLE_LENGTH: 3,
+  MAX_OBSTACLE_DUPLICATION: 2,
+  RESOURCE_TEMPLATE_ID: 'audio-resources',
+  SPEED: 6,
+  SPEED_DROP_COEFFICIENT: 3,
+  ARCADE_MODE_INITIAL_TOP_POSITION: 35,
+  ARCADE_MODE_TOP_POSITION_PERCENT: 0.1,
+};
+
+Runner.normalConfig = {
+  ACCELERATION: 0.001,
+  AUDIOCUE_PROXIMITY_THRESHOLD: 190,
+  AUDIOCUE_PROXIMITY_THRESHOLD_MOBILE_A11Y: 250,
+  GAP_COEFFICIENT: 0.6,
+  INVERT_DISTANCE: 700,
+  MAX_SPEED: 13,
+  MOBILE_SPEED_COEFFICIENT: 1.2,
+  SPEED: 6,
+};
+
+
+Runner.slowConfig = {
+  ACCELERATION: 0.0005,
+  AUDIOCUE_PROXIMITY_THRESHOLD: 170,
+  AUDIOCUE_PROXIMITY_THRESHOLD_MOBILE_A11Y: 220,
+  GAP_COEFFICIENT: 0.3,
+  INVERT_DISTANCE: 350,
+  MAX_SPEED: 9,
+  MOBILE_SPEED_COEFFICIENT: 1.5,
+  SPEED: 4.2,
+};
+
+
+/**
+ * Default dimensions.
+ */
+Runner.defaultDimensions = {
+  WIDTH: DEFAULT_WIDTH,
+  HEIGHT: 150,
+};
+
+
+/**
+ * CSS class names.
+ * @enum {string}
+ */
+Runner.classes = {
+  ARCADE_MODE: 'arcade-mode',
+  CANVAS: 'runner-canvas',
+  CONTAINER: 'runner-container',
+  CRASHED: 'crashed',
+  ICON: 'icon-offline',
+  INVERTED: 'inverted',
+  SNACKBAR: 'snackbar',
+  SNACKBAR_SHOW: 'snackbar-show',
+  TOUCH_CONTROLLER: 'controller',
+};
+
+
+/**
+ * Sound FX. Reference to the ID of the audio tag on interstitial page.
+ * @enum {string}
+ */
+Runner.sounds = {
+  BUTTON_PRESS: 'offline-sound-press',
+  HIT: 'offline-sound-hit',
+  SCORE: 'offline-sound-reached',
+};
+
+
+/**
+ * Key code mapping.
+ * @enum {Object}
+ */
+Runner.keycodes = {
+  JUMP: {'38': 1, '32': 1},  // Up, spacebar
+  DUCK: {'40': 1},           // Down
+  RESTART: {'13': 1},        // Enter
+};
+
+
+/**
+ * Runner event names.
+ * @enum {string}
+ */
+Runner.events = {
+  ANIM_END: 'webkitAnimationEnd',
+  CLICK: 'click',
+  KEYDOWN: 'keydown',
+  KEYUP: 'keyup',
+  POINTERDOWN: 'pointerdown',
+  POINTERUP: 'pointerup',
+  RESIZE: 'resize',
+  TOUCHEND: 'touchend',
+  TOUCHSTART: 'touchstart',
+  VISIBILITY: 'visibilitychange',
+  BLUR: 'blur',
+  FOCUS: 'focus',
+  LOAD: 'load',
+  GAMEPADCONNECTED: 'gamepadconnected',
+};
+
+Runner.prototype = {
+  /**
+   * Initialize alternative game type.
+   */
+  initAltGameType() {
+    if (GAME_TYPE.length > 0) {
+      this.gameType = loadTimeData && loadTimeData.valueExists('altGameType') ?
+          GAME_TYPE[parseInt(loadTimeData.getValue('altGameType'), 10) - 1] :
+          '';
+    }
+  },
+
+  /**
+   * Whether the easter egg has been disabled. CrOS enterprise enrolled devices.
+   * @return {boolean}
+   */
+  isDisabled() {
+    return loadTimeData && loadTimeData.valueExists('disabledEasterEgg');
+  },
+
+  /**
+   * For disabled instances, set up a snackbar with the disabled message.
+   */
+  setupDisabledRunner() {
+    this.containerEl = document.createElement('div');
+    this.containerEl.className = Runner.classes.SNACKBAR;
+    this.containerEl.textContent = loadTimeData.getValue('disabledEasterEgg');
+    this.outerContainerEl.appendChild(this.containerEl);
+
+    // Show notification when the activation key is pressed.
+    document.addEventListener(Runner.events.KEYDOWN, function(e) {
+      if (Runner.keycodes.JUMP[e.keyCode]) {
+        this.containerEl.classList.add(Runner.classes.SNACKBAR_SHOW);
+        document.querySelector('.icon').classList.add('icon-disabled');
+      }
+    }.bind(this));
+  },
+
+  /**
+   * Setting individual settings for debugging.
+   * @param {string} setting
+   * @param {number|string} value
+   */
+  updateConfigSetting(setting, value) {
+    if (setting in this.config && value !== undefined) {
+      this.config[setting] = value;
+
+      switch (setting) {
+        case 'GRAVITY':
+        case 'MIN_JUMP_HEIGHT':
+        case 'SPEED_DROP_COEFFICIENT':
+          this.tRex.config[setting] = value;
+          break;
+        case 'INITIAL_JUMP_VELOCITY':
+          this.tRex.setJumpVelocity(value);
+          break;
+        case 'SPEED':
+          this.setSpeed(/** @type {number} */ (value));
+          break;
+      }
+    }
+  },
+
+  /**
+   * Creates an on page image element from the base 64 encoded string source.
+   * @param {string} resourceName Name in data object,
+   * @return {HTMLImageElement} The created element.
+   */
+  createImageElement(resourceName) {
+    const imgSrc = loadTimeData && loadTimeData.valueExists(resourceName) ?
+        loadTimeData.getString(resourceName) :
+        null;
+
+    if (imgSrc) {
+      const el =
+          /** @type {HTMLImageElement} */ (document.createElement('img'));
+      el.id = resourceName;
+      el.src = imgSrc;
+      document.getElementById('offline-resources').appendChild(el);
+      return el;
+    }
+    return null;
+  },
+
+  /**
+   * Cache the appropriate image sprite from the page and get the sprite sheet
+   * definition.
+   */
+  loadImages() {
+    let scale = '1x';
+    this.spriteDef = Runner.spriteDefinition.LDPI;
+    if (IS_HIDPI) {
+      scale = '2x';
+      this.spriteDef = Runner.spriteDefinition.HDPI;
+    }
+
+    Runner.imageSprite = /** @type {HTMLImageElement} */
+        (document.getElementById(RESOURCE_POSTFIX + scale));
+
+    if (this.gameType) {
+      Runner.altGameImageSprite = /** @type {HTMLImageElement} */
+          (this.createImageElement('altGameSpecificImage' + scale));
+      Runner.altCommonImageSprite = /** @type {HTMLImageElement} */
+          (this.createImageElement('altGameCommonImage' + scale));
+    }
+    Runner.origImageSprite = Runner.imageSprite;
+
+    // Disable the alt game mode if the sprites can't be loaded.
+    if (!Runner.altGameImageSprite || !Runner.altCommonImageSprite) {
+      Runner.isAltGameModeEnabled = () => false;
+      this.altGameModeActive = false;
+    }
+
+    if (Runner.imageSprite.complete) {
+      this.init();
+    } else {
+      // If the images are not yet loaded, add a listener.
+      Runner.imageSprite.addEventListener(Runner.events.LOAD,
+          this.init.bind(this));
+    }
+  },
+
+  /**
+   * Load and decode base 64 encoded sounds.
+   */
+  loadSounds() {
+    if (!IS_IOS) {
+      this.audioContext = new AudioContext();
+
+      const resourceTemplate =
+          document.getElementById(this.config.RESOURCE_TEMPLATE_ID).content;
+
+      for (const sound in Runner.sounds) {
+        let soundSrc =
+            resourceTemplate.getElementById(Runner.sounds[sound]).src;
+        soundSrc = soundSrc.substr(soundSrc.indexOf(',') + 1);
+        const buffer = decodeBase64ToArrayBuffer(soundSrc);
+
+        // Async, so no guarantee of order in array.
+        this.audioContext.decodeAudioData(buffer, function(index, audioData) {
+            this.soundFx[index] = audioData;
+          }.bind(this, sound));
+      }
+    }
+  },
+
+  /**
+   * Sets the game speed. Adjust the speed accordingly if on a smaller screen.
+   * @param {number=} opt_speed
+   */
+  setSpeed(opt_speed) {
+    const speed = opt_speed || this.currentSpeed;
+
+    // Reduce the speed on smaller mobile screens.
+    if (this.dimensions.WIDTH < DEFAULT_WIDTH) {
+      const mobileSpeed = Runner.slowDown ? speed :
+                                            speed * this.dimensions.WIDTH /
+              DEFAULT_WIDTH * this.config.MOBILE_SPEED_COEFFICIENT;
+      this.currentSpeed = mobileSpeed > speed ? speed : mobileSpeed;
+    } else if (opt_speed) {
+      this.currentSpeed = opt_speed;
+    }
+  },
+
+  /**
+   * Game initialiser.
+   */
+  init() {
+    // Hide the static icon.
+    document.querySelector('.' + Runner.classes.ICON).style.visibility =
+        'hidden';
+
+    this.adjustDimensions();
+    this.setSpeed();
+
+    const ariaLabel = getA11yString(A11Y_STRINGS.ariaLabel);
+    this.containerEl = document.createElement('div');
+    this.containerEl.setAttribute('role', IS_MOBILE ? 'button' : 'application');
+    this.containerEl.setAttribute('tabindex', '0');
+    this.containerEl.setAttribute('title', ariaLabel);
+
+    this.containerEl.className = Runner.classes.CONTAINER;
+
+    // Player canvas container.
+    this.canvas = createCanvas(this.containerEl, this.dimensions.WIDTH,
+        this.dimensions.HEIGHT);
+
+    // Live region for game status updates.
+    this.a11yStatusEl = document.createElement('span');
+    this.a11yStatusEl.className = 'offline-runner-live-region';
+    this.a11yStatusEl.setAttribute('aria-live', 'assertive');
+    this.a11yStatusEl.textContent = '';
+    Runner.a11yStatusEl = this.a11yStatusEl;
+
+    // Add checkbox to slow down the game.
+    this.slowSpeedCheckboxLabel = document.createElement('label');
+    this.slowSpeedCheckboxLabel.className = 'slow-speed-option hidden';
+    this.slowSpeedCheckboxLabel.textContent =
+        getA11yString(A11Y_STRINGS.speedLabel);
+
+    this.slowSpeedCheckbox = document.createElement('input');
+    this.slowSpeedCheckbox.setAttribute('type', 'checkbox');
+    this.slowSpeedCheckbox.setAttribute(
+        'title', getA11yString(A11Y_STRINGS.speedLabel));
+    this.slowSpeedCheckbox.setAttribute('tabindex', '0');
+    this.slowSpeedCheckbox.setAttribute('checked', 'checked');
+
+    this.slowSpeedToggleEl = document.createElement('span');
+    this.slowSpeedToggleEl.className = 'slow-speed-toggle';
+
+    this.slowSpeedCheckboxLabel.appendChild(this.slowSpeedCheckbox);
+    this.slowSpeedCheckboxLabel.appendChild(this.slowSpeedToggleEl);
+
+    if (IS_IOS) {
+      this.outerContainerEl.appendChild(this.a11yStatusEl);
+    } else {
+      this.containerEl.appendChild(this.a11yStatusEl);
+    }
+
+    announcePhrase(getA11yString(A11Y_STRINGS.description));
+
+    this.generatedSoundFx = new GeneratedSoundFx();
+
+    this.canvasCtx =
+        /** @type {CanvasRenderingContext2D} */ (this.canvas.getContext('2d'));
+    this.canvasCtx.fillStyle = '#f7f7f7';
+    this.canvasCtx.fill();
+    Runner.updateCanvasScaling(this.canvas);
+
+    // Horizon contains clouds, obstacles and the ground.
+    this.horizon = new Horizon(this.canvas, this.spriteDef, this.dimensions,
+        this.config.GAP_COEFFICIENT);
+
+    // Distance meter
+    this.distanceMeter = new DistanceMeter(this.canvas,
+          this.spriteDef.TEXT_SPRITE, this.dimensions.WIDTH);
+
+    // Draw t-rex
+    this.tRex = new Trex(this.canvas, this.spriteDef.TREX);
+
+    this.outerContainerEl.appendChild(this.containerEl);
+    this.outerContainerEl.appendChild(this.slowSpeedCheckboxLabel);
+
+    this.startListening();
+    this.update();
+
+    window.addEventListener(Runner.events.RESIZE,
+        this.debounceResize.bind(this));
+
+    // Handle dark mode
+    const darkModeMediaQuery =
+        window.matchMedia('(prefers-color-scheme: dark)');
+    this.isDarkMode = darkModeMediaQuery && darkModeMediaQuery.matches;
+    darkModeMediaQuery.addListener((e) => {
+      this.isDarkMode = e.matches;
+    });
+  },
+
+  /**
+   * Create the touch controller. A div that covers whole screen.
+   */
+  createTouchController() {
+    this.touchController = document.createElement('div');
+    this.touchController.className = Runner.classes.TOUCH_CONTROLLER;
+    this.touchController.addEventListener(Runner.events.TOUCHSTART, this);
+    this.touchController.addEventListener(Runner.events.TOUCHEND, this);
+    this.outerContainerEl.appendChild(this.touchController);
+  },
+
+  /**
+   * Debounce the resize event.
+   */
+  debounceResize() {
+    if (!this.resizeTimerId_) {
+      this.resizeTimerId_ =
+          setInterval(this.adjustDimensions.bind(this), 250);
+    }
+  },
+
+  /**
+   * Adjust game space dimensions on resize.
+   */
+  adjustDimensions() {
+    clearInterval(this.resizeTimerId_);
+    this.resizeTimerId_ = null;
+
+    const boxStyles = window.getComputedStyle(this.outerContainerEl);
+    const padding = Number(boxStyles.paddingLeft.substr(0,
+        boxStyles.paddingLeft.length - 2));
+
+    this.dimensions.WIDTH = this.outerContainerEl.offsetWidth - padding * 2;
+    if (this.isArcadeMode()) {
+      this.dimensions.WIDTH = Math.min(DEFAULT_WIDTH, this.dimensions.WIDTH);
+      if (this.activated) {
+        this.setArcadeModeContainerScale();
+      }
+    }
+
+    // Redraw the elements back onto the canvas.
+    if (this.canvas) {
+      this.canvas.width = this.dimensions.WIDTH;
+      this.canvas.height = this.dimensions.HEIGHT;
+
+      Runner.updateCanvasScaling(this.canvas);
+
+      this.distanceMeter.calcXPos(this.dimensions.WIDTH);
+      this.clearCanvas();
+      this.horizon.update(0, 0, true);
+      this.tRex.update(0);
+
+      // Outer container and distance meter.
+      if (this.playing || this.crashed || this.paused) {
+        this.containerEl.style.width = this.dimensions.WIDTH + 'px';
+        this.containerEl.style.height = this.dimensions.HEIGHT + 'px';
+        this.distanceMeter.update(0, Math.ceil(this.distanceRan));
+        this.stop();
+      } else {
+        this.tRex.draw(0, 0);
+      }
+
+      // Game over panel.
+      if (this.crashed && this.gameOverPanel) {
+        this.gameOverPanel.updateDimensions(this.dimensions.WIDTH);
+        this.gameOverPanel.draw(this.altGameModeActive, this.tRex);
+      }
+    }
+  },
+
+  /**
+   * Play the game intro.
+   * Canvas container width expands out to the full width.
+   */
+  playIntro() {
+    if (!this.activated && !this.crashed) {
+      this.playingIntro = true;
+      this.tRex.playingIntro = true;
+
+      // CSS animation definition.
+      const keyframes = '@-webkit-keyframes intro { ' +
+            'from { width:' + Trex.config.WIDTH + 'px }' +
+            'to { width: ' + this.dimensions.WIDTH + 'px }' +
+          '}';
+      document.styleSheets[0].insertRule(keyframes, 0);
+
+      this.containerEl.addEventListener(Runner.events.ANIM_END,
+          this.startGame.bind(this));
+
+      this.containerEl.style.webkitAnimation = 'intro .4s ease-out 1 both';
+      this.containerEl.style.width = this.dimensions.WIDTH + 'px';
+
+      this.setPlayStatus(true);
+      this.activated = true;
+    } else if (this.crashed) {
+      this.restart();
+    }
+  },
+
+
+  /**
+   * Update the game status to started.
+   */
+  startGame() {
+    if (this.isArcadeMode()) {
+      this.setArcadeMode();
+    }
+    this.toggleSpeed();
+    this.runningTime = 0;
+    this.playingIntro = false;
+    this.tRex.playingIntro = false;
+    this.containerEl.style.webkitAnimation = '';
+    this.playCount++;
+    this.generatedSoundFx.background();
+    announcePhrase(getA11yString(A11Y_STRINGS.started));
+
+    if (Runner.audioCues) {
+      this.containerEl.setAttribute('title', getA11yString(A11Y_STRINGS.jump));
+    }
+
+    // Handle tabbing off the page. Pause the current game.
+    document.addEventListener(Runner.events.VISIBILITY,
+          this.onVisibilityChange.bind(this));
+
+    window.addEventListener(Runner.events.BLUR,
+          this.onVisibilityChange.bind(this));
+
+    window.addEventListener(Runner.events.FOCUS,
+          this.onVisibilityChange.bind(this));
+  },
+
+  clearCanvas() {
+    this.canvasCtx.clearRect(0, 0, this.dimensions.WIDTH,
+        this.dimensions.HEIGHT);
+  },
+
+  /**
+   * Checks whether the canvas area is in the viewport of the browser
+   * through the current scroll position.
+   * @return boolean.
+   */
+  isCanvasInView() {
+    return this.containerEl.getBoundingClientRect().top >
+        Runner.config.CANVAS_IN_VIEW_OFFSET;
+  },
+
+  /**
+   * Enable the alt game mode. Switching out the sprites.
+   */
+  enableAltGameMode() {
+    Runner.imageSprite = Runner.altGameImageSprite;
+    Runner.spriteDefinition = spriteDefinitionByType[Runner.gameType];
+
+    if (IS_HIDPI) {
+      this.spriteDef = Runner.spriteDefinition.HDPI;
+    } else {
+      this.spriteDef = Runner.spriteDefinition.LDPI;
+    }
+
+    this.altGameModeActive = true;
+    this.tRex.enableAltGameMode(this.spriteDef.TREX);
+    this.horizon.enableAltGameMode(this.spriteDef);
+    this.generatedSoundFx.background();
+  },
+
+  /**
+   * Update the game frame and schedules the next one.
+   */
+  update() {
+    this.updatePending = false;
+
+    const now = getTimeStamp();
+    let deltaTime = now - (this.time || now);
+
+    // Flashing when switching game modes.
+    if (this.altGameModeFlashTimer < 0 || this.altGameModeFlashTimer === 0) {
+      this.altGameModeFlashTimer = null;
+      this.tRex.setFlashing(false);
+      this.enableAltGameMode();
+    } else if (this.altGameModeFlashTimer > 0) {
+      this.altGameModeFlashTimer -= deltaTime;
+      this.tRex.update(deltaTime);
+      deltaTime = 0;
+    }
+
+    this.time = now;
+
+    if (this.playing) {
+      this.clearCanvas();
+
+      // Additional fade in - Prevents jump when switching sprites
+      if (this.altGameModeActive &&
+          this.fadeInTimer <= this.config.FADE_DURATION) {
+        this.fadeInTimer += deltaTime / 1000;
+        this.canvasCtx.globalAlpha = this.fadeInTimer;
+      } else {
+        this.canvasCtx.globalAlpha = 1;
+      }
+
+      if (this.tRex.jumping) {
+        this.tRex.updateJump(deltaTime);
+      }
+
+      this.runningTime += deltaTime;
+      const hasObstacles = this.runningTime > this.config.CLEAR_TIME;
+
+      // First jump triggers the intro.
+      if (this.tRex.jumpCount === 1 && !this.playingIntro) {
+        this.playIntro();
+      }
+
+      // The horizon doesn't move until the intro is over.
+      if (this.playingIntro) {
+        this.horizon.update(0, this.currentSpeed, hasObstacles);
+      } else if (!this.crashed) {
+        const showNightMode = this.isDarkMode ^ this.inverted;
+        deltaTime = !this.activated ? 0 : deltaTime;
+        this.horizon.update(
+            deltaTime, this.currentSpeed, hasObstacles, showNightMode);
+      }
+
+      // Check for collisions.
+      let collision = hasObstacles &&
+          checkForCollision(this.horizon.obstacles[0], this.tRex);
+
+      // For a11y, audio cues.
+      if (Runner.audioCues && hasObstacles) {
+        const jumpObstacle =
+            this.horizon.obstacles[0].typeConfig.type != 'COLLECTABLE';
+
+        if (!this.horizon.obstacles[0].jumpAlerted) {
+          const threshold = Runner.isMobileMouseInput ?
+              Runner.config.AUDIOCUE_PROXIMITY_THRESHOLD_MOBILE_A11Y :
+              Runner.config.AUDIOCUE_PROXIMITY_THRESHOLD;
+          const adjProximityThreshold = threshold +
+              (threshold * Math.log10(this.currentSpeed / Runner.config.SPEED));
+
+          if (this.horizon.obstacles[0].xPos < adjProximityThreshold) {
+            if (jumpObstacle) {
+              this.generatedSoundFx.jump();
+            }
+            this.horizon.obstacles[0].jumpAlerted = true;
+          }
+        }
+      }
+
+      // Activated alt game mode.
+      if (Runner.isAltGameModeEnabled() && collision &&
+          this.horizon.obstacles[0].typeConfig.type == 'COLLECTABLE') {
+        this.horizon.removeFirstObstacle();
+        this.tRex.setFlashing(true);
+        collision = false;
+        this.altGameModeFlashTimer = this.config.FLASH_DURATION;
+        this.runningTime = 0;
+        this.generatedSoundFx.collect();
+      }
+
+      if (!collision) {
+        this.distanceRan += this.currentSpeed * deltaTime / this.msPerFrame;
+
+        if (this.currentSpeed < this.config.MAX_SPEED) {
+          this.currentSpeed += this.config.ACCELERATION;
+        }
+      } else {
+        this.gameOver();
+      }
+
+      const playAchievementSound = this.distanceMeter.update(deltaTime,
+          Math.ceil(this.distanceRan));
+
+      if (!Runner.audioCues && playAchievementSound) {
+        this.playSound(this.soundFx.SCORE);
+      }
+
+      // Night mode.
+      if (!Runner.isAltGameModeEnabled()) {
+        if (this.invertTimer > this.config.INVERT_FADE_DURATION) {
+          this.invertTimer = 0;
+          this.invertTrigger = false;
+          this.invert(false);
+        } else if (this.invertTimer) {
+          this.invertTimer += deltaTime;
+        } else {
+          const actualDistance =
+              this.distanceMeter.getActualDistance(Math.ceil(this.distanceRan));
+
+          if (actualDistance > 0) {
+            this.invertTrigger =
+                !(actualDistance % this.config.INVERT_DISTANCE);
+
+            if (this.invertTrigger && this.invertTimer === 0) {
+              this.invertTimer += deltaTime;
+              this.invert(false);
+            }
+          }
+        }
+      }
+    }
+
+    if (this.playing || (!this.activated &&
+        this.tRex.blinkCount < Runner.config.MAX_BLINK_COUNT)) {
+      this.tRex.update(deltaTime);
+      this.scheduleNextUpdate();
+    }
+  },
+
+  /**
+   * Event handler.
+   * @param {Event} e
+   */
+  handleEvent(e) {
+    return (function(evtType, events) {
+      switch (evtType) {
+        case events.KEYDOWN:
+        case events.TOUCHSTART:
+        case events.POINTERDOWN:
+          this.onKeyDown(e);
+          break;
+        case events.KEYUP:
+        case events.TOUCHEND:
+        case events.POINTERUP:
+          this.onKeyUp(e);
+          break;
+        case events.GAMEPADCONNECTED:
+          this.onGamepadConnected(e);
+          break;
+      }
+    }.bind(this))(e.type, Runner.events);
+  },
+
+  /**
+   * Initialize audio cues if activated by focus on the canvas element.
+   * @param {Event} e
+   */
+  handleCanvasKeyPress(e) {
+    if (!this.activated && !Runner.audioCues) {
+      this.toggleSpeed();
+      Runner.audioCues = true;
+      this.generatedSoundFx.init();
+      Runner.generatedSoundFx = this.generatedSoundFx;
+      Runner.config.CLEAR_TIME *= 1.2;
+    } else if (e.keyCode && Runner.keycodes.JUMP[e.keyCode]) {
+      this.onKeyDown(e);
+    }
+  },
+
+  /**
+   * Prevent space key press from scrolling.
+   * @param {Event} e
+   */
+  preventScrolling(e) {
+    if (e.keyCode === 32) {
+      e.preventDefault();
+    }
+  },
+
+  /**
+   * Toggle speed setting if toggle is shown.
+   */
+  toggleSpeed() {
+    if (Runner.audioCues) {
+      const speedChange = Runner.slowDown != this.slowSpeedCheckbox.checked;
+
+      if (speedChange) {
+        Runner.slowDown = this.slowSpeedCheckbox.checked;
+        const updatedConfig =
+            Runner.slowDown ? Runner.slowConfig : Runner.normalConfig;
+
+        Runner.config = Object.assign(Runner.config, updatedConfig);
+        this.currentSpeed = updatedConfig.SPEED;
+        this.tRex.enableSlowConfig();
+        this.horizon.adjustObstacleSpeed();
+      }
+      if (this.playing) {
+        this.disableSpeedToggle(true);
+      }
+    }
+  },
+
+  /**
+   * Show the speed toggle.
+   * From focus event or when audio cues are activated.
+   * @param {Event=} e
+   */
+  showSpeedToggle(e) {
+    const isFocusEvent = e && e.type == 'focus';
+    if (Runner.audioCues || isFocusEvent) {
+      this.slowSpeedCheckboxLabel.classList.toggle(
+          HIDDEN_CLASS, isFocusEvent ? false : !this.crashed);
+    }
+  },
+
+  /**
+   * Disable the speed toggle.
+   * @param {boolean} disable
+   */
+  disableSpeedToggle(disable) {
+    if (disable) {
+      this.slowSpeedCheckbox.setAttribute('disabled', 'disabled');
+    } else {
+      this.slowSpeedCheckbox.removeAttribute('disabled');
+    }
+  },
+
+  /**
+   * Bind relevant key / mouse / touch listeners.
+   */
+  startListening() {
+    // A11y keyboard / screen reader activation.
+    this.containerEl.addEventListener(
+        Runner.events.KEYDOWN, this.handleCanvasKeyPress.bind(this));
+    if (!IS_MOBILE) {
+      this.containerEl.addEventListener(
+          Runner.events.FOCUS, this.showSpeedToggle.bind(this));
+    }
+    this.canvas.addEventListener(
+        Runner.events.KEYDOWN, this.preventScrolling.bind(this));
+    this.canvas.addEventListener(
+        Runner.events.KEYUP, this.preventScrolling.bind(this));
+
+    // Keys.
+    document.addEventListener(Runner.events.KEYDOWN, this);
+    document.addEventListener(Runner.events.KEYUP, this);
+
+    // Touch / pointer.
+    this.containerEl.addEventListener(Runner.events.TOUCHSTART, this);
+    document.addEventListener(Runner.events.POINTERDOWN, this);
+    document.addEventListener(Runner.events.POINTERUP, this);
+
+    if (this.isArcadeMode()) {
+      // Gamepad
+      window.addEventListener(Runner.events.GAMEPADCONNECTED, this);
+    }
+  },
+
+  /**
+   * Remove all listeners.
+   */
+  stopListening() {
+    document.removeEventListener(Runner.events.KEYDOWN, this);
+    document.removeEventListener(Runner.events.KEYUP, this);
+
+    if (this.touchController) {
+      this.touchController.removeEventListener(Runner.events.TOUCHSTART, this);
+      this.touchController.removeEventListener(Runner.events.TOUCHEND, this);
+    }
+
+    this.containerEl.removeEventListener(Runner.events.TOUCHSTART, this);
+    document.removeEventListener(Runner.events.POINTERDOWN, this);
+    document.removeEventListener(Runner.events.POINTERUP, this);
+
+    if (this.isArcadeMode()) {
+      window.removeEventListener(Runner.events.GAMEPADCONNECTED, this);
+    }
+  },
+
+  /**
+   * Process keydown.
+   * @param {Event} e
+   */
+  onKeyDown(e) {
+    // Prevent native page scrolling whilst tapping on mobile.
+    if (IS_MOBILE && this.playing) {
+      e.preventDefault();
+    }
+
+    if (this.isCanvasInView()) {
+      // Allow toggling of speed toggle.
+      if (Runner.keycodes.JUMP[e.keyCode] &&
+          e.target == this.slowSpeedCheckbox) {
+        return;
+      }
+
+      if (!this.crashed && !this.paused) {
+        // For a11y, screen reader activation.
+        const isMobileMouseInput = IS_MOBILE &&
+            e.type === Runner.events.POINTERDOWN && e.pointerType == 'mouse' &&
+            (e.target == this.containerEl ||
+             (IS_IOS &&
+              (e.target == this.touchController || e.target == this.canvas)));
+
+        if (Runner.keycodes.JUMP[e.keyCode] ||
+            e.type === Runner.events.TOUCHSTART || isMobileMouseInput) {
+          e.preventDefault();
+          // Starting the game for the first time.
+          if (!this.playing) {
+            // Started by touch so create a touch controller.
+            if (!this.touchController && e.type === Runner.events.TOUCHSTART) {
+              this.createTouchController();
+            }
+
+            if (isMobileMouseInput) {
+              this.handleCanvasKeyPress(e);
+            }
+            this.loadSounds();
+            this.setPlayStatus(true);
+            this.update();
+            if (window.errorPageController) {
+              errorPageController.trackEasterEgg();
+            }
+          }
+          // Start jump.
+          if (!this.tRex.jumping && !this.tRex.ducking) {
+            if (Runner.audioCues) {
+              this.generatedSoundFx.cancelFootSteps();
+            } else {
+              this.playSound(this.soundFx.BUTTON_PRESS);
+            }
+            this.tRex.startJump(this.currentSpeed);
+          }
+        } else if (this.playing && Runner.keycodes.DUCK[e.keyCode]) {
+          e.preventDefault();
+          if (this.tRex.jumping) {
+            // Speed drop, activated only when jump key is not pressed.
+            this.tRex.setSpeedDrop();
+          } else if (!this.tRex.jumping && !this.tRex.ducking) {
+            // Duck.
+            this.tRex.setDuck(true);
+          }
+        }
+      }
+    }
+  },
+
+  /**
+   * Process key up.
+   * @param {Event} e
+   */
+  onKeyUp(e) {
+    const keyCode = String(e.keyCode);
+    const isjumpKey = Runner.keycodes.JUMP[keyCode] ||
+        e.type === Runner.events.TOUCHEND || e.type === Runner.events.POINTERUP;
+
+    if (this.isRunning() && isjumpKey) {
+      this.tRex.endJump();
+    } else if (Runner.keycodes.DUCK[keyCode]) {
+      this.tRex.speedDrop = false;
+      this.tRex.setDuck(false);
+    } else if (this.crashed) {
+      // Check that enough time has elapsed before allowing jump key to restart.
+      const deltaTime = getTimeStamp() - this.time;
+
+      if (this.isCanvasInView() &&
+          (Runner.keycodes.RESTART[keyCode] || this.isLeftClickOnCanvas(e) ||
+          (deltaTime >= this.config.GAMEOVER_CLEAR_TIME &&
+          Runner.keycodes.JUMP[keyCode]))) {
+        this.handleGameOverClicks(e);
+      }
+    } else if (this.paused && isjumpKey) {
+      // Reset the jump state
+      this.tRex.reset();
+      this.play();
+    }
+  },
+
+  /**
+   * Process gamepad connected event.
+   * @param {Event} e
+   */
+  onGamepadConnected(e) {
+    if (!this.pollingGamepads) {
+      this.pollGamepadState();
+    }
+  },
+
+  /**
+   * rAF loop for gamepad polling.
+   */
+  pollGamepadState() {
+    const gamepads = navigator.getGamepads();
+    this.pollActiveGamepad(gamepads);
+
+    this.pollingGamepads = true;
+    requestAnimationFrame(this.pollGamepadState.bind(this));
+  },
+
+  /**
+   * Polls for a gamepad with the jump button pressed. If one is found this
+   * becomes the "active" gamepad and all others are ignored.
+   * @param {!Array<Gamepad>} gamepads
+   */
+  pollForActiveGamepad(gamepads) {
+    for (let i = 0; i < gamepads.length; ++i) {
+      if (gamepads[i] && gamepads[i].buttons.length > 0 &&
+          gamepads[i].buttons[0].pressed) {
+        this.gamepadIndex = i;
+        this.pollActiveGamepad(gamepads);
+        return;
+      }
+    }
+  },
+
+  /**
+   * Polls the chosen gamepad for button presses and generates KeyboardEvents
+   * to integrate with the rest of the game logic.
+   * @param {!Array<Gamepad>} gamepads
+   */
+  pollActiveGamepad(gamepads) {
+    if (this.gamepadIndex === undefined) {
+      this.pollForActiveGamepad(gamepads);
+      return;
+    }
+
+    const gamepad = gamepads[this.gamepadIndex];
+    if (!gamepad) {
+      this.gamepadIndex = undefined;
+      this.pollForActiveGamepad(gamepads);
+      return;
+    }
+
+    // The gamepad specification defines the typical mapping of physical buttons
+    // to button indicies: https://w3c.github.io/gamepad/#remapping
+    this.pollGamepadButton(gamepad, 0, 38);  // Jump
+    if (gamepad.buttons.length >= 2) {
+      this.pollGamepadButton(gamepad, 1, 40);  // Duck
+    }
+    if (gamepad.buttons.length >= 10) {
+      this.pollGamepadButton(gamepad, 9, 13);  // Restart
+    }
+
+    this.previousGamepad = gamepad;
+  },
+
+  /**
+   * Generates a key event based on a gamepad button.
+   * @param {!Gamepad} gamepad
+   * @param {number} buttonIndex
+   * @param {number} keyCode
+   */
+  pollGamepadButton(gamepad, buttonIndex, keyCode) {
+    const state = gamepad.buttons[buttonIndex].pressed;
+    let previousState = false;
+    if (this.previousGamepad) {
+      previousState = this.previousGamepad.buttons[buttonIndex].pressed;
+    }
+    // Generate key events on the rising and falling edge of a button press.
+    if (state !== previousState) {
+      const e = new KeyboardEvent(state ? Runner.events.KEYDOWN
+                                      : Runner.events.KEYUP,
+                                { keyCode: keyCode });
+      document.dispatchEvent(e);
+    }
+  },
+
+  /**
+   * Handle interactions on the game over screen state.
+   * A user is able to tap the high score twice to reset it.
+   * @param {Event} e
+   */
+  handleGameOverClicks(e) {
+    if (e.target != this.slowSpeedCheckbox) {
+      e.preventDefault();
+      if (this.distanceMeter.hasClickedOnHighScore(e) && this.highestScore) {
+        if (this.distanceMeter.isHighScoreFlashing()) {
+          // Subsequent click, reset the high score.
+          this.saveHighScore(0, true);
+          this.distanceMeter.resetHighScore();
+        } else {
+          // First click, flash the high score.
+          this.distanceMeter.startHighScoreFlashing();
+        }
+      } else {
+        this.distanceMeter.cancelHighScoreFlashing();
+        this.restart();
+      }
+    }
+  },
+
+  /**
+   * Returns whether the event was a left click on canvas.
+   * On Windows right click is registered as a click.
+   * @param {Event} e
+   * @return {boolean}
+   */
+  isLeftClickOnCanvas(e) {
+    return e.button != null && e.button < 2 &&
+        e.type === Runner.events.POINTERUP &&
+        (e.target === this.canvas ||
+         (IS_MOBILE && Runner.audioCues && e.target === this.containerEl));
+  },
+
+  /**
+   * RequestAnimationFrame wrapper.
+   */
+  scheduleNextUpdate() {
+    if (!this.updatePending) {
+      this.updatePending = true;
+      this.raqId = requestAnimationFrame(this.update.bind(this));
+    }
+  },
+
+  /**
+   * Whether the game is running.
+   * @return {boolean}
+   */
+  isRunning() {
+    return !!this.raqId;
+  },
+
+  /**
+   * Set the initial high score as stored in the user's profile.
+   * @param {number} highScore
+   */
+  initializeHighScore(highScore) {
+    this.syncHighestScore = true;
+    highScore = Math.ceil(highScore);
+    if (highScore < this.highestScore) {
+      if (window.errorPageController) {
+        errorPageController.updateEasterEggHighScore(this.highestScore);
+      }
+      return;
+    }
+    this.highestScore = highScore;
+    this.distanceMeter.setHighScore(this.highestScore);
+  },
+
+  /**
+   * Sets the current high score and saves to the profile if available.
+   * @param {number} distanceRan Total distance ran.
+   * @param {boolean=} opt_resetScore Whether to reset the score.
+   */
+  saveHighScore(distanceRan, opt_resetScore) {
+    this.highestScore = Math.ceil(distanceRan);
+    this.distanceMeter.setHighScore(this.highestScore);
+
+    // Store the new high score in the profile.
+    if (this.syncHighestScore && window.errorPageController) {
+      if (opt_resetScore) {
+        errorPageController.resetEasterEggHighScore();
+      } else {
+        errorPageController.updateEasterEggHighScore(this.highestScore);
+      }
+    }
+  },
+
+  /**
+   * Game over state.
+   */
+  gameOver() {
+    this.playSound(this.soundFx.HIT);
+    vibrate(200);
+
+    this.stop();
+    this.crashed = true;
+    this.distanceMeter.achievement = false;
+
+    this.tRex.update(100, Trex.status.CRASHED);
+
+    // Game over panel.
+    if (!this.gameOverPanel) {
+      const origSpriteDef = IS_HIDPI ? spriteDefinitionByType.original.HDPI :
+                                       spriteDefinitionByType.original.LDPI;
+
+      if (this.canvas) {
+        if (Runner.isAltGameModeEnabled) {
+          this.gameOverPanel = new GameOverPanel(
+              this.canvas, origSpriteDef.TEXT_SPRITE, origSpriteDef.RESTART,
+              this.dimensions, origSpriteDef.ALT_GAME_END,
+              this.altGameModeActive);
+        } else {
+          this.gameOverPanel = new GameOverPanel(
+              this.canvas, origSpriteDef.TEXT_SPRITE, origSpriteDef.RESTART,
+              this.dimensions);
+        }
+      }
+    }
+
+    this.gameOverPanel.draw(this.altGameModeActive, this.tRex);
+
+    // Update the high score.
+    if (this.distanceRan > this.highestScore) {
+      this.saveHighScore(this.distanceRan);
+    }
+
+    // Reset the time clock.
+    this.time = getTimeStamp();
+
+    if (Runner.audioCues) {
+      this.generatedSoundFx.stopAll();
+      announcePhrase(
+          getA11yString(A11Y_STRINGS.gameOver)
+              .replace(
+                  '$1',
+                  this.distanceMeter.getActualDistance(this.distanceRan)
+                      .toString()) +
+          ' ' +
+          getA11yString(A11Y_STRINGS.highScore)
+              .replace(
+                  '$1',
+
+                  this.distanceMeter.getActualDistance(this.highestScore)
+                      .toString()));
+      this.containerEl.setAttribute(
+          'title', getA11yString(A11Y_STRINGS.ariaLabel));
+    }
+    this.showSpeedToggle();
+    this.disableSpeedToggle(false);
+  },
+
+  stop() {
+    this.setPlayStatus(false);
+    this.paused = true;
+    cancelAnimationFrame(this.raqId);
+    this.raqId = 0;
+    this.generatedSoundFx.stopAll();
+  },
+
+  play() {
+    if (!this.crashed) {
+      this.setPlayStatus(true);
+      this.paused = false;
+      this.tRex.update(0, Trex.status.RUNNING);
+      this.time = getTimeStamp();
+      this.update();
+      this.generatedSoundFx.background();
+    }
+  },
+
+  restart() {
+    if (!this.raqId) {
+      this.playCount++;
+      this.runningTime = 0;
+      this.setPlayStatus(true);
+      this.toggleSpeed();
+      this.paused = false;
+      this.crashed = false;
+      this.distanceRan = 0;
+      this.setSpeed(this.config.SPEED);
+      this.time = getTimeStamp();
+      this.containerEl.classList.remove(Runner.classes.CRASHED);
+      this.clearCanvas();
+      this.distanceMeter.reset();
+      this.horizon.reset();
+      this.tRex.reset();
+      this.playSound(this.soundFx.BUTTON_PRESS);
+      this.invert(true);
+      this.flashTimer = null;
+      this.update();
+      this.gameOverPanel.reset();
+      this.generatedSoundFx.background();
+      this.containerEl.setAttribute('title', getA11yString(A11Y_STRINGS.jump));
+      announcePhrase(getA11yString(A11Y_STRINGS.started));
+    }
+  },
+
+  setPlayStatus(isPlaying) {
+    if (this.touchController) {
+      this.touchController.classList.toggle(HIDDEN_CLASS, !isPlaying);
+    }
+    this.playing = isPlaying;
+  },
+
+  /**
+   * Whether the game should go into arcade mode.
+   * @return {boolean}
+   */
+  isArcadeMode() {
+    // In RTL languages the title is wrapped with the left to right mark
+    // control characters &#x202A; and &#x202C but are invisible.
+    return IS_RTL ? document.title.indexOf(ARCADE_MODE_URL) == 1 :
+                    document.title === ARCADE_MODE_URL;
+  },
+
+  /**
+   * Hides offline messaging for a fullscreen game only experience.
+   */
+  setArcadeMode() {
+    document.body.classList.add(Runner.classes.ARCADE_MODE);
+    this.setArcadeModeContainerScale();
+  },
+
+  /**
+   * Sets the scaling for arcade mode.
+   */
+  setArcadeModeContainerScale() {
+    const windowHeight = window.innerHeight;
+    const scaleHeight = windowHeight / this.dimensions.HEIGHT;
+    const scaleWidth = window.innerWidth / this.dimensions.WIDTH;
+    const scale = Math.max(1, Math.min(scaleHeight, scaleWidth));
+    const scaledCanvasHeight = this.dimensions.HEIGHT * scale;
+    // Positions the game container at 10% of the available vertical window
+    // height minus the game container height.
+    const translateY = Math.ceil(Math.max(0, (windowHeight - scaledCanvasHeight -
+        Runner.config.ARCADE_MODE_INITIAL_TOP_POSITION) *
+        Runner.config.ARCADE_MODE_TOP_POSITION_PERCENT)) *
+        window.devicePixelRatio;
+
+    const cssScale = IS_RTL ? -scale + ',' + scale : scale;
+    this.containerEl.style.transform =
+        'scale(' + cssScale + ') translateY(' + translateY + 'px)';
+  },
+
+  /**
+   * Pause the game if the tab is not in focus.
+   */
+  onVisibilityChange(e) {
+    if (document.hidden || document.webkitHidden || e.type === 'blur' ||
+        document.visibilityState !== 'visible') {
+      this.stop();
+    } else if (!this.crashed) {
+      this.tRex.reset();
+      this.play();
+    }
+  },
+
+  /**
+   * Play a sound.
+   * @param {AudioBuffer} soundBuffer
+   */
+  playSound(soundBuffer) {
+    if (soundBuffer) {
+      const sourceNode = this.audioContext.createBufferSource();
+      sourceNode.buffer = soundBuffer;
+      sourceNode.connect(this.audioContext.destination);
+      sourceNode.start(0);
+    }
+  },
+
+  /**
+   * Inverts the current page / canvas colors.
+   * @param {boolean} reset Whether to reset colors.
+   */
+  invert(reset) {
+    const htmlEl = document.firstElementChild;
+
+    if (reset) {
+      htmlEl.classList.toggle(Runner.classes.INVERTED,
+          false);
+      this.invertTimer = 0;
+      this.inverted = false;
+    } else {
+      this.inverted = htmlEl.classList.toggle(
+          Runner.classes.INVERTED, this.invertTrigger);
+    }
+  },
+};
+
+
+/**
+ * Updates the canvas size taking into
+ * account the backing store pixel ratio and
+ * the device pixel ratio.
+ *
+ * See article by Paul Lewis:
+ * http://www.html5rocks.com/en/tutorials/canvas/hidpi/
+ *
+ * @param {HTMLCanvasElement} canvas
+ * @param {number=} opt_width
+ * @param {number=} opt_height
+ * @return {boolean} Whether the canvas was scaled.
+ */
+Runner.updateCanvasScaling = function(canvas, opt_width, opt_height) {
+  const context =
+      /** @type {CanvasRenderingContext2D} */ (canvas.getContext('2d'));
+
+  // Query the various pixel ratios
+  const devicePixelRatio = Math.floor(window.devicePixelRatio) || 1;
+  /** @suppress {missingProperties} */
+  const backingStoreRatio =
+      Math.floor(context.webkitBackingStorePixelRatio) || 1;
+  const ratio = devicePixelRatio / backingStoreRatio;
+
+  // Upscale the canvas if the two ratios don't match
+  if (devicePixelRatio !== backingStoreRatio) {
+    const oldWidth = opt_width || canvas.width;
+    const oldHeight = opt_height || canvas.height;
+
+    canvas.width = oldWidth * ratio;
+    canvas.height = oldHeight * ratio;
+
+    canvas.style.width = oldWidth + 'px';
+    canvas.style.height = oldHeight + 'px';
+
+    // Scale the context to counter the fact that we've manually scaled
+    // our canvas element.
+    context.scale(ratio, ratio);
+    return true;
+  } else if (devicePixelRatio === 1) {
+    // Reset the canvas width / height. Fixes scaling bug when the page is
+    // zoomed and the devicePixelRatio changes accordingly.
+    canvas.style.width = canvas.width + 'px';
+    canvas.style.height = canvas.height + 'px';
+  }
+  return false;
+};
+
+
+/**
+ * Whether events are enabled.
+ * @return {boolean}
+ */
+Runner.isAltGameModeEnabled = function() {
+  return loadTimeData && loadTimeData.valueExists('enableAltGameMode');
+};
+
+
+/**
+ * Generated sound FX class for audio cues.
+ * @constructor
+ */
+function GeneratedSoundFx() {
+  this.audioCues = false;
+  this.context = null;
+  this.panner = null;
+}
+
+GeneratedSoundFx.prototype = {
+  init() {
+    this.audioCues = true;
+    if (!this.context) {
+      // iOS only supports the webkit version.
+      this.context = window.webkitAudioContext ? new webkitAudioContext() :
+                                                 new AudioContext();
+      if (IS_IOS) {
+        this.context.onstatechange = (function() {
+                                       if (this.context.state != 'running') {
+                                         this.context.resume();
+                                       }
+                                     }).bind(this);
+        this.context.resume();
+      }
+      this.panner = this.context.createStereoPanner ?
+          this.context.createStereoPanner() :
+          null;
+    }
+  },
+
+  stopAll() {
+    this.cancelFootSteps();
+  },
+
+  /**
+   * Play oscillators at certain frequency and for a certain time.
+   * @param {number} frequency
+   * @param {number} startTime
+   * @param {number} duration
+   * @param {?number=} opt_vol
+   * @param {number=} opt_pan
+   */
+  playNote(frequency, startTime, duration, opt_vol, opt_pan) {
+    const osc1 = this.context.createOscillator();
+    const osc2 = this.context.createOscillator();
+    const volume = this.context.createGain();
+
+    // Set oscillator wave type
+    osc1.type = 'triangle';
+    osc2.type = 'triangle';
+    volume.gain.value = 0.1;
+
+    // Set up node routing
+    if (this.panner) {
+      this.panner.pan.value = opt_pan || 0;
+      osc1.connect(volume).connect(this.panner);
+      osc2.connect(volume).connect(this.panner);
+      this.panner.connect(this.context.destination);
+    } else {
+      osc1.connect(volume);
+      osc2.connect(volume);
+      volume.connect(this.context.destination);
+    }
+
+    // Detune oscillators for chorus effect
+    osc1.frequency.value = frequency + 1;
+    osc2.frequency.value = frequency - 2;
+
+    // Fade out
+    volume.gain.setValueAtTime(opt_vol || 0.01, startTime + duration - 0.05);
+    volume.gain.linearRampToValueAtTime(0.00001, startTime + duration);
+
+    // Start oscillators
+    osc1.start(startTime);
+    osc2.start(startTime);
+    // Stop oscillators
+    osc1.stop(startTime + duration);
+    osc2.stop(startTime + duration);
+  },
+
+  background() {
+    if (this.audioCues) {
+      const now = this.context.currentTime;
+      this.playNote(493.883, now, 0.116);
+      this.playNote(659.255, now + 0.116, 0.232);
+      this.loopFootSteps();
+    }
+  },
+
+  loopFootSteps() {
+    if (this.audioCues && !this.bgSoundIntervalId) {
+      this.bgSoundIntervalId = setInterval(function() {
+        this.playNote(73.42, this.context.currentTime, 0.05, 0.16);
+        this.playNote(69.30, this.context.currentTime + 0.116, 0.116, 0.16);
+      }.bind(this), 280);
+    }
+  },
+
+  cancelFootSteps() {
+    if (this.audioCues && this.bgSoundIntervalId) {
+      clearInterval(this.bgSoundIntervalId);
+      this.bgSoundIntervalId = null;
+      this.playNote(103.83, this.context.currentTime, 0.232, 0.02);
+      this.playNote(116.54, this.context.currentTime + 0.116, 0.232, 0.02);
+    }
+  },
+
+  collect() {
+    if (this.audioCues) {
+      this.cancelFootSteps();
+      const now = this.context.currentTime;
+      this.playNote(830.61, now, 0.116);
+      this.playNote(1318.51, now + 0.116, 0.232);
+    }
+  },
+
+  jump() {
+    if (this.audioCues) {
+      const now = this.context.currentTime;
+      this.playNote(659.25, now, 0.116, 0.3, -0.6);
+      this.playNote(880, now + 0.116, 0.232, 0.3, -0.6);
+    }
+  },
+};
+
+
+/**
+ * For screen readers make an announcement to the live region.
+ * @param {string} phrase Sentence to speak.
+ */
+function announcePhrase(phrase) {
+  if (Runner.a11yStatusEl) {
+    Runner.a11yStatusEl.textContent = '';
+    Runner.a11yStatusEl.textContent = phrase;
+  }
+}
+
+
+/**
+ * Returns a string from loadTimeData data object.
+ * @param {string} stringName
+ * @return {string}
+ */
+function getA11yString(stringName) {
+  return loadTimeData && loadTimeData.valueExists(stringName) ?
+      loadTimeData.getString(stringName) :
+      '';
+}
+
+
+/**
+ * Get random number.
+ * @param {number} min
+ * @param {number} max
+ */
+function getRandomNum(min, max) {
+  return Math.floor(Math.random() * (max - min + 1)) + min;
+}
+
+
+/**
+ * Vibrate on mobile devices.
+ * @param {number} duration Duration of the vibration in milliseconds.
+ */
+function vibrate(duration) {
+  if (IS_MOBILE && window.navigator.vibrate) {
+    window.navigator.vibrate(duration);
+  }
+}
+
+
+/**
+ * Create canvas element.
+ * @param {Element} container Element to append canvas to.
+ * @param {number} width
+ * @param {number} height
+ * @param {string=} opt_classname
+ * @return {HTMLCanvasElement}
+ */
+function createCanvas(container, width, height, opt_classname) {
+  const canvas =
+      /** @type {!HTMLCanvasElement} */ (document.createElement('canvas'));
+  canvas.className = opt_classname ? Runner.classes.CANVAS + ' ' +
+      opt_classname : Runner.classes.CANVAS;
+  canvas.width = width;
+  canvas.height = height;
+  container.appendChild(canvas);
+
+  return canvas;
+}
+
+
+/**
+ * Decodes the base 64 audio to ArrayBuffer used by Web Audio.
+ * @param {string} base64String
+ */
+function decodeBase64ToArrayBuffer(base64String) {
+  const len = (base64String.length / 4) * 3;
+  const str = atob(base64String);
+  const arrayBuffer = new ArrayBuffer(len);
+  const bytes = new Uint8Array(arrayBuffer);
+
+  for (let i = 0; i < len; i++) {
+    bytes[i] = str.charCodeAt(i);
+  }
+  return bytes.buffer;
+}
+
+
+/**
+ * Return the current timestamp.
+ * @return {number}
+ */
+function getTimeStamp() {
+  return IS_IOS ? new Date().getTime() : performance.now();
+}
+
+
+//******************************************************************************
+
+
+/**
+ * Game over panel.
+ * @param {!HTMLCanvasElement} canvas
+ * @param {Object} textImgPos
+ * @param {Object} restartImgPos
+ * @param {!Object} dimensions Canvas dimensions.
+ * @param {Object=} opt_altGameEndImgPos
+ * @param {boolean=} opt_altGameActive
+ * @constructor
+ */
+function GameOverPanel(
+    canvas, textImgPos, restartImgPos, dimensions, opt_altGameEndImgPos,
+    opt_altGameActive) {
+  this.canvas = canvas;
+  this.canvasCtx =
+      /** @type {CanvasRenderingContext2D} */ (canvas.getContext('2d'));
+  this.canvasDimensions = dimensions;
+  this.textImgPos = textImgPos;
+  this.restartImgPos = restartImgPos;
+  this.altGameEndImgPos = opt_altGameEndImgPos;
+  this.altGameModeActive = opt_altGameActive;
+
+  // Retry animation.
+  this.frameTimeStamp = 0;
+  this.animTimer = 0;
+  this.currentFrame = 0;
+
+  this.gameOverRafId = null;
+
+  this.flashTimer = 0;
+  this.flashCounter = 0;
+  this.originalText = true;
+}
+
+GameOverPanel.RESTART_ANIM_DURATION = 875;
+GameOverPanel.LOGO_PAUSE_DURATION = 875;
+GameOverPanel.FLASH_ITERATIONS = 5;
+
+/**
+ * Animation frames spec.
+ */
+GameOverPanel.animConfig = {
+  frames: [0, 36, 72, 108, 144, 180, 216, 252],
+  msPerFrame: GameOverPanel.RESTART_ANIM_DURATION / 8,
+};
+
+/**
+ * Dimensions used in the panel.
+ * @enum {number}
+ */
+GameOverPanel.dimensions = {
+  TEXT_X: 0,
+  TEXT_Y: 13,
+  TEXT_WIDTH: 191,
+  TEXT_HEIGHT: 11,
+  RESTART_WIDTH: 36,
+  RESTART_HEIGHT: 32,
+};
+
+
+GameOverPanel.prototype = {
+  /**
+   * Update the panel dimensions.
+   * @param {number} width New canvas width.
+   * @param {number} opt_height Optional new canvas height.
+   */
+  updateDimensions(width, opt_height) {
+    this.canvasDimensions.WIDTH = width;
+    if (opt_height) {
+      this.canvasDimensions.HEIGHT = opt_height;
+    }
+    this.currentFrame = GameOverPanel.animConfig.frames.length - 1;
+  },
+
+  drawGameOverText(dimensions, opt_useAltText) {
+    const centerX = this.canvasDimensions.WIDTH / 2;
+    let textSourceX = dimensions.TEXT_X;
+    let textSourceY = dimensions.TEXT_Y;
+    let textSourceWidth = dimensions.TEXT_WIDTH;
+    let textSourceHeight = dimensions.TEXT_HEIGHT;
+
+    const textTargetX = Math.round(centerX - (dimensions.TEXT_WIDTH / 2));
+    const textTargetY = Math.round((this.canvasDimensions.HEIGHT - 25) / 3);
+    const textTargetWidth = dimensions.TEXT_WIDTH;
+    const textTargetHeight = dimensions.TEXT_HEIGHT;
+
+    if (IS_HIDPI) {
+      textSourceY *= 2;
+      textSourceX *= 2;
+      textSourceWidth *= 2;
+      textSourceHeight *= 2;
+    }
+
+    if (!opt_useAltText) {
+      textSourceX += this.textImgPos.x;
+      textSourceY += this.textImgPos.y;
+    }
+
+    const spriteSource =
+        opt_useAltText ? Runner.altCommonImageSprite : Runner.origImageSprite;
+
+    this.canvasCtx.save();
+
+    if (IS_RTL) {
+      this.canvasCtx.translate(this.canvasDimensions.WIDTH, 0);
+      this.canvasCtx.scale(-1, 1);
+    }
+
+    // Game over text from sprite.
+    this.canvasCtx.drawImage(
+        spriteSource, textSourceX, textSourceY, textSourceWidth,
+        textSourceHeight, textTargetX, textTargetY, textTargetWidth,
+        textTargetHeight);
+
+    this.canvasCtx.restore();
+  },
+
+  /**
+   * Draw additional adornments for alternative game types.
+   */
+  drawAltGameElements(tRex) {
+    // Additional adornments.
+    if (this.altGameModeActive && Runner.spriteDefinition.ALT_GAME_END_CONFIG) {
+      const altGameEndConfig = Runner.spriteDefinition.ALT_GAME_END_CONFIG;
+
+      let altGameEndSourceWidth = altGameEndConfig.WIDTH;
+      let altGameEndSourceHeight = altGameEndConfig.HEIGHT;
+      const altGameEndTargetX = tRex.xPos + altGameEndConfig.X_OFFSET;
+      const altGameEndTargetY = tRex.yPos + altGameEndConfig.Y_OFFSET;
+
+      if (IS_HIDPI) {
+        altGameEndSourceWidth *= 2;
+        altGameEndSourceHeight *= 2;
+      }
+
+      this.canvasCtx.drawImage(
+          Runner.altCommonImageSprite, this.altGameEndImgPos.x,
+          this.altGameEndImgPos.y, altGameEndSourceWidth,
+          altGameEndSourceHeight, altGameEndTargetX, altGameEndTargetY,
+          altGameEndConfig.WIDTH, altGameEndConfig.HEIGHT);
+    }
+  },
+
+  /**
+   * Draw restart button.
+   */
+  drawRestartButton() {
+    const dimensions = GameOverPanel.dimensions;
+    let framePosX = GameOverPanel.animConfig.frames[this.currentFrame];
+    let restartSourceWidth = dimensions.RESTART_WIDTH;
+    let restartSourceHeight = dimensions.RESTART_HEIGHT;
+    const restartTargetX =
+        (this.canvasDimensions.WIDTH / 2) - (dimensions.RESTART_WIDTH / 2);
+    const restartTargetY = this.canvasDimensions.HEIGHT / 2;
+
+    if (IS_HIDPI) {
+      restartSourceWidth *= 2;
+      restartSourceHeight *= 2;
+      framePosX *= 2;
+    }
+
+    this.canvasCtx.save();
+
+    if (IS_RTL) {
+      this.canvasCtx.translate(this.canvasDimensions.WIDTH, 0);
+      this.canvasCtx.scale(-1, 1);
+    }
+
+    this.canvasCtx.drawImage(
+        Runner.origImageSprite, this.restartImgPos.x + framePosX,
+        this.restartImgPos.y, restartSourceWidth, restartSourceHeight,
+        restartTargetX, restartTargetY, dimensions.RESTART_WIDTH,
+        dimensions.RESTART_HEIGHT);
+    this.canvasCtx.restore();
+  },
+
+
+  /**
+   * Draw the panel.
+   * @param {boolean} opt_altGameModeActive
+   * @param {!Trex} opt_tRex
+   */
+  draw(opt_altGameModeActive, opt_tRex) {
+    if (opt_altGameModeActive) {
+      this.altGameModeActive = opt_altGameModeActive;
+    }
+
+    this.drawGameOverText(GameOverPanel.dimensions, false);
+    this.drawRestartButton();
+    this.drawAltGameElements(opt_tRex);
+    this.update();
+  },
+
+  /**
+   * Update animation frames.
+   */
+  update() {
+    const now = getTimeStamp();
+    const deltaTime = now - (this.frameTimeStamp || now);
+
+    this.frameTimeStamp = now;
+    this.animTimer += deltaTime;
+    this.flashTimer += deltaTime;
+
+    // Restart Button
+    if (this.currentFrame == 0 &&
+        this.animTimer > GameOverPanel.LOGO_PAUSE_DURATION) {
+      this.animTimer = 0;
+      this.currentFrame++;
+      this.drawRestartButton();
+    } else if (
+        this.currentFrame > 0 &&
+        this.currentFrame < GameOverPanel.animConfig.frames.length) {
+      if (this.animTimer >= GameOverPanel.animConfig.msPerFrame) {
+        this.currentFrame++;
+        this.drawRestartButton();
+      }
+    } else if (
+        !this.altGameModeActive &&
+        this.currentFrame == GameOverPanel.animConfig.frames.length) {
+      this.reset();
+      return;
+    }
+
+    // Game over text
+    if (this.altGameModeActive &&
+        spriteDefinitionByType.original.ALT_GAME_OVER_TEXT_CONFIG) {
+      const altTextConfig =
+          spriteDefinitionByType.original.ALT_GAME_OVER_TEXT_CONFIG;
+
+      if (altTextConfig.FLASHING) {
+        if (this.flashCounter < GameOverPanel.FLASH_ITERATIONS &&
+            this.flashTimer > altTextConfig.FLASH_DURATION) {
+          this.flashTimer = 0;
+          this.originalText = !this.originalText;
+
+          this.clearGameOverTextBounds();
+          if (this.originalText) {
+            this.drawGameOverText(GameOverPanel.dimensions, false);
+            this.flashCounter++;
+          } else {
+            this.drawGameOverText(altTextConfig, true);
+          }
+        } else if (this.flashCounter >= GameOverPanel.FLASH_ITERATIONS) {
+          this.reset();
+          return;
+        }
+      } else {
+        this.clearGameOverTextBounds(altTextConfig);
+        this.drawGameOverText(altTextConfig, true);
+      }
+    }
+
+    this.gameOverRafId = requestAnimationFrame(this.update.bind(this));
+  },
+
+  /**
+   * Clear game over text.
+   * @param {Object} dimensions Game over text config.
+   */
+  clearGameOverTextBounds(dimensions) {
+    this.canvasCtx.save();
+
+    this.canvasCtx.clearRect(
+        Math.round(
+            this.canvasDimensions.WIDTH / 2 - (dimensions.TEXT_WIDTH / 2)),
+        Math.round((this.canvasDimensions.HEIGHT - 25) / 3),
+        dimensions.TEXT_WIDTH, dimensions.TEXT_HEIGHT + 4);
+    this.canvasCtx.restore();
+  },
+
+  reset() {
+    if (this.gameOverRafId) {
+      cancelAnimationFrame(this.gameOverRafId);
+      this.gameOverRafId = null;
+    }
+    this.animTimer = 0;
+    this.frameTimeStamp = 0;
+    this.currentFrame = 0;
+    this.flashTimer = 0;
+    this.flashCounter = 0;
+    this.originalText = true;
+  },
+};
+
+
+//******************************************************************************
+
+/**
+ * Check for a collision.
+ * @param {!Obstacle} obstacle
+ * @param {!Trex} tRex T-rex object.
+ * @param {CanvasRenderingContext2D=} opt_canvasCtx Optional canvas context for
+ *    drawing collision boxes.
+ * @return {Array<CollisionBox>|undefined}
+ */
+function checkForCollision(obstacle, tRex, opt_canvasCtx) {
+  Runner.defaultDimensions.WIDTH + obstacle.xPos;
+
+  // Adjustments are made to the bounding box as there is a 1 pixel white
+  // border around the t-rex and obstacles.
+  const tRexBox = new CollisionBox(
+      tRex.xPos + 1,
+      tRex.yPos + 1,
+      tRex.config.WIDTH - 2,
+      tRex.config.HEIGHT - 2);
+
+  const obstacleBox = new CollisionBox(
+      obstacle.xPos + 1,
+      obstacle.yPos + 1,
+      obstacle.typeConfig.width * obstacle.size - 2,
+      obstacle.typeConfig.height - 2);
+
+  // Debug outer box
+  if (opt_canvasCtx) {
+    drawCollisionBoxes(opt_canvasCtx, tRexBox, obstacleBox);
+  }
+
+  // Simple outer bounds check.
+  if (boxCompare(tRexBox, obstacleBox)) {
+    const collisionBoxes = obstacle.collisionBoxes;
+    let tRexCollisionBoxes = [];
+
+    if (Runner.isAltGameModeEnabled()) {
+      tRexCollisionBoxes = Runner.spriteDefinition.TREX.COLLISION_BOXES;
+    } else {
+      tRexCollisionBoxes = tRex.ducking ? Trex.collisionBoxes.DUCKING :
+                                          Trex.collisionBoxes.RUNNING;
+    }
+
+    // Detailed axis aligned box check.
+    for (let t = 0; t < tRexCollisionBoxes.length; t++) {
+      for (let i = 0; i < collisionBoxes.length; i++) {
+        // Adjust the box to actual positions.
+        const adjTrexBox =
+            createAdjustedCollisionBox(tRexCollisionBoxes[t], tRexBox);
+        const adjObstacleBox =
+            createAdjustedCollisionBox(collisionBoxes[i], obstacleBox);
+        const crashed = boxCompare(adjTrexBox, adjObstacleBox);
+
+        // Draw boxes for debug.
+        if (opt_canvasCtx) {
+          drawCollisionBoxes(opt_canvasCtx, adjTrexBox, adjObstacleBox);
+        }
+
+        if (crashed) {
+          return [adjTrexBox, adjObstacleBox];
+        }
+      }
+    }
+  }
+}
+
+
+/**
+ * Adjust the collision box.
+ * @param {!CollisionBox} box The original box.
+ * @param {!CollisionBox} adjustment Adjustment box.
+ * @return {CollisionBox} The adjusted collision box object.
+ */
+function createAdjustedCollisionBox(box, adjustment) {
+  return new CollisionBox(
+      box.x + adjustment.x,
+      box.y + adjustment.y,
+      box.width,
+      box.height);
+}
+
+
+/**
+ * Draw the collision boxes for debug.
+ */
+function drawCollisionBoxes(canvasCtx, tRexBox, obstacleBox) {
+  canvasCtx.save();
+  canvasCtx.strokeStyle = '#f00';
+  canvasCtx.strokeRect(tRexBox.x, tRexBox.y, tRexBox.width, tRexBox.height);
+
+  canvasCtx.strokeStyle = '#0f0';
+  canvasCtx.strokeRect(obstacleBox.x, obstacleBox.y,
+      obstacleBox.width, obstacleBox.height);
+  canvasCtx.restore();
+}
+
+
+/**
+ * Compare two collision boxes for a collision.
+ * @param {CollisionBox} tRexBox
+ * @param {CollisionBox} obstacleBox
+ * @return {boolean} Whether the boxes intersected.
+ */
+function boxCompare(tRexBox, obstacleBox) {
+  let crashed = false;
+  tRexBox.x;
+  tRexBox.y;
+
+  const obstacleBoxX = obstacleBox.x;
+  obstacleBox.y;
+
+  // Axis-Aligned Bounding Box method.
+  if (tRexBox.x < obstacleBoxX + obstacleBox.width &&
+      tRexBox.x + tRexBox.width > obstacleBoxX &&
+      tRexBox.y < obstacleBox.y + obstacleBox.height &&
+      tRexBox.height + tRexBox.y > obstacleBox.y) {
+    crashed = true;
+  }
+
+  return crashed;
+}
+
+
+//******************************************************************************
+
+/**
+ * Obstacle.
+ * @param {CanvasRenderingContext2D} canvasCtx
+ * @param {ObstacleType} type
+ * @param {Object} spriteImgPos Obstacle position in sprite.
+ * @param {Object} dimensions
+ * @param {number} gapCoefficient Mutipler in determining the gap.
+ * @param {number} speed
+ * @param {number=} opt_xOffset
+ * @param {boolean=} opt_isAltGameMode
+ * @constructor
+ */
+function Obstacle(
+    canvasCtx, type, spriteImgPos, dimensions, gapCoefficient, speed,
+    opt_xOffset, opt_isAltGameMode) {
+  this.canvasCtx = canvasCtx;
+  this.spritePos = spriteImgPos;
+  this.typeConfig = type;
+  this.gapCoefficient = Runner.slowDown ? gapCoefficient * 2 : gapCoefficient;
+  this.size = getRandomNum(1, Obstacle.MAX_OBSTACLE_LENGTH);
+  this.dimensions = dimensions;
+  this.remove = false;
+  this.xPos = dimensions.WIDTH + (opt_xOffset || 0);
+  this.yPos = 0;
+  this.width = 0;
+  this.collisionBoxes = [];
+  this.gap = 0;
+  this.speedOffset = 0;
+  this.altGameModeActive = opt_isAltGameMode;
+  this.imageSprite = this.typeConfig.type == 'COLLECTABLE' ?
+      Runner.altCommonImageSprite :
+      this.altGameModeActive ? Runner.altGameImageSprite : Runner.imageSprite;
+
+  // For animated obstacles.
+  this.currentFrame = 0;
+  this.timer = 0;
+
+  this.init(speed);
+}
+
+/**
+ * Coefficient for calculating the maximum gap.
+ */
+Obstacle.MAX_GAP_COEFFICIENT = 1.5;
+
+/**
+ * Maximum obstacle grouping count.
+ */
+Obstacle.MAX_OBSTACLE_LENGTH = 3;
+
+
+Obstacle.prototype = {
+  /**
+   * Initialise the DOM for the obstacle.
+   * @param {number} speed
+   */
+  init(speed) {
+    this.cloneCollisionBoxes();
+
+    // Only allow sizing if we're at the right speed.
+    if (this.size > 1 && this.typeConfig.multipleSpeed > speed) {
+      this.size = 1;
+    }
+
+    this.width = this.typeConfig.width * this.size;
+
+    // Check if obstacle can be positioned at various heights.
+    if (Array.isArray(this.typeConfig.yPos)) {
+      const yPosConfig =
+          IS_MOBILE ? this.typeConfig.yPosMobile : this.typeConfig.yPos;
+      this.yPos = yPosConfig[getRandomNum(0, yPosConfig.length - 1)];
+    } else {
+      this.yPos = this.typeConfig.yPos;
+    }
+
+    this.draw();
+
+    // Make collision box adjustments,
+    // Central box is adjusted to the size as one box.
+    //      ____        ______        ________
+    //    _|   |-|    _|     |-|    _|       |-|
+    //   | |<->| |   | |<--->| |   | |<----->| |
+    //   | | 1 | |   | |  2  | |   | |   3   | |
+    //   |_|___|_|   |_|_____|_|   |_|_______|_|
+    //
+    if (this.size > 1) {
+      this.collisionBoxes[1].width = this.width - this.collisionBoxes[0].width -
+          this.collisionBoxes[2].width;
+      this.collisionBoxes[2].x = this.width - this.collisionBoxes[2].width;
+    }
+
+    // For obstacles that go at a different speed from the horizon.
+    if (this.typeConfig.speedOffset) {
+      this.speedOffset = Math.random() > 0.5 ? this.typeConfig.speedOffset :
+                                               -this.typeConfig.speedOffset;
+    }
+
+    this.gap = this.getGap(this.gapCoefficient, speed);
+
+    // Increase gap for audio cues enabled.
+    if (Runner.audioCues) {
+      this.gap *= 2;
+    }
+  },
+
+  /**
+   * Draw and crop based on size.
+   */
+  draw() {
+    let sourceWidth = this.typeConfig.width;
+    let sourceHeight = this.typeConfig.height;
+
+    if (IS_HIDPI) {
+      sourceWidth = sourceWidth * 2;
+      sourceHeight = sourceHeight * 2;
+    }
+
+    // X position in sprite.
+    let sourceX =
+        (sourceWidth * this.size) * (0.5 * (this.size - 1)) + this.spritePos.x;
+
+    // Animation frames.
+    if (this.currentFrame > 0) {
+      sourceX += sourceWidth * this.currentFrame;
+    }
+
+    this.canvasCtx.drawImage(
+        this.imageSprite, sourceX, this.spritePos.y, sourceWidth * this.size,
+        sourceHeight, this.xPos, this.yPos, this.typeConfig.width * this.size,
+        this.typeConfig.height);
+  },
+
+  /**
+   * Obstacle frame update.
+   * @param {number} deltaTime
+   * @param {number} speed
+   */
+  update(deltaTime, speed) {
+    if (!this.remove) {
+      if (this.typeConfig.speedOffset) {
+        speed += this.speedOffset;
+      }
+      this.xPos -= Math.floor((speed * FPS / 1000) * deltaTime);
+
+      // Update frame
+      if (this.typeConfig.numFrames) {
+        this.timer += deltaTime;
+        if (this.timer >= this.typeConfig.frameRate) {
+          this.currentFrame =
+              this.currentFrame === this.typeConfig.numFrames - 1 ?
+              0 :
+              this.currentFrame + 1;
+          this.timer = 0;
+        }
+      }
+      this.draw();
+
+      if (!this.isVisible()) {
+        this.remove = true;
+      }
+    }
+  },
+
+  /**
+   * Calculate a random gap size.
+   * - Minimum gap gets wider as speed increses
+   * @param {number} gapCoefficient
+   * @param {number} speed
+   * @return {number} The gap size.
+   */
+  getGap(gapCoefficient, speed) {
+    const minGap = Math.round(
+        this.width * speed + this.typeConfig.minGap * gapCoefficient);
+    const maxGap = Math.round(minGap * Obstacle.MAX_GAP_COEFFICIENT);
+    return getRandomNum(minGap, maxGap);
+  },
+
+  /**
+   * Check if obstacle is visible.
+   * @return {boolean} Whether the obstacle is in the game area.
+   */
+  isVisible() {
+    return this.xPos + this.width > 0;
+  },
+
+  /**
+   * Make a copy of the collision boxes, since these will change based on
+   * obstacle type and size.
+   */
+  cloneCollisionBoxes() {
+    const collisionBoxes = this.typeConfig.collisionBoxes;
+
+    for (let i = collisionBoxes.length - 1; i >= 0; i--) {
+      this.collisionBoxes[i] = new CollisionBox(
+          collisionBoxes[i].x, collisionBoxes[i].y, collisionBoxes[i].width,
+          collisionBoxes[i].height);
+    }
+  },
+};
+
+
+//******************************************************************************
+/**
+ * T-rex game character.
+ * @param {HTMLCanvasElement} canvas
+ * @param {Object} spritePos Positioning within image sprite.
+ * @constructor
+ */
+function Trex(canvas, spritePos) {
+  this.canvas = canvas;
+  this.canvasCtx =
+      /** @type {CanvasRenderingContext2D} */ (canvas.getContext('2d'));
+  this.spritePos = spritePos;
+  this.xPos = 0;
+  this.yPos = 0;
+  this.xInitialPos = 0;
+  // Position when on the ground.
+  this.groundYPos = 0;
+  this.currentFrame = 0;
+  this.currentAnimFrames = [];
+  this.blinkDelay = 0;
+  this.blinkCount = 0;
+  this.animStartTime = 0;
+  this.timer = 0;
+  this.msPerFrame = 1000 / FPS;
+  this.config = Object.assign(Trex.config, Trex.normalJumpConfig);
+  // Current status.
+  this.status = Trex.status.WAITING;
+  this.jumping = false;
+  this.ducking = false;
+  this.jumpVelocity = 0;
+  this.reachedMinHeight = false;
+  this.speedDrop = false;
+  this.jumpCount = 0;
+  this.jumpspotX = 0;
+  this.altGameModeEnabled = false;
+  this.flashing = false;
+
+  this.init();
+}
+
+
+/**
+ * T-rex player config.
+ */
+Trex.config = {
+  DROP_VELOCITY: -5,
+  FLASH_OFF: 175,
+  FLASH_ON: 100,
+  HEIGHT: 47,
+  HEIGHT_DUCK: 25,
+  INTRO_DURATION: 1500,
+  SPEED_DROP_COEFFICIENT: 3,
+  SPRITE_WIDTH: 262,
+  START_X_POS: 50,
+  WIDTH: 44,
+  WIDTH_DUCK: 59,
+};
+
+Trex.slowJumpConfig = {
+  GRAVITY: 0.25,
+  MAX_JUMP_HEIGHT: 50,
+  MIN_JUMP_HEIGHT: 45,
+  INITIAL_JUMP_VELOCITY: -20,
+};
+
+Trex.normalJumpConfig = {
+  GRAVITY: 0.6,
+  MAX_JUMP_HEIGHT: 30,
+  MIN_JUMP_HEIGHT: 30,
+  INITIAL_JUMP_VELOCITY: -10,
+};
+
+/**
+ * Used in collision detection.
+ * @enum {Array<CollisionBox>}
+ */
+Trex.collisionBoxes = {
+  DUCKING: [new CollisionBox(1, 18, 55, 25)],
+  RUNNING: [
+    new CollisionBox(22, 0, 17, 16),
+    new CollisionBox(1, 18, 30, 9),
+    new CollisionBox(10, 35, 14, 8),
+    new CollisionBox(1, 24, 29, 5),
+    new CollisionBox(5, 30, 21, 4),
+    new CollisionBox(9, 34, 15, 4),
+  ],
+};
+
+
+/**
+ * Animation states.
+ * @enum {string}
+ */
+Trex.status = {
+  CRASHED: 'CRASHED',
+  DUCKING: 'DUCKING',
+  JUMPING: 'JUMPING',
+  RUNNING: 'RUNNING',
+  WAITING: 'WAITING',
+};
+
+/**
+ * Blinking coefficient.
+ * @const
+ */
+Trex.BLINK_TIMING = 7000;
+
+
+/**
+ * Animation config for different states.
+ * @enum {Object}
+ */
+Trex.animFrames = {
+  WAITING: {
+    frames: [44, 0],
+    msPerFrame: 1000 / 3,
+  },
+  RUNNING: {
+    frames: [88, 132],
+    msPerFrame: 1000 / 12,
+  },
+  CRASHED: {
+    frames: [220],
+    msPerFrame: 1000 / 60,
+  },
+  JUMPING: {
+    frames: [0],
+    msPerFrame: 1000 / 60,
+  },
+  DUCKING: {
+    frames: [264, 323],
+    msPerFrame: 1000 / 8,
+  },
+};
+
+
+Trex.prototype = {
+  /**
+   * T-rex player initaliser.
+   * Sets the t-rex to blink at random intervals.
+   */
+  init() {
+    this.groundYPos = Runner.defaultDimensions.HEIGHT - this.config.HEIGHT -
+        Runner.config.BOTTOM_PAD;
+    this.yPos = this.groundYPos;
+    this.minJumpHeight = this.groundYPos - this.config.MIN_JUMP_HEIGHT;
+
+    this.draw(0, 0);
+    this.update(0, Trex.status.WAITING);
+  },
+
+  /**
+   * Assign the appropriate jump parameters based on the game speed.
+   */
+  enableSlowConfig: function() {
+    const jumpConfig =
+        Runner.slowDown ? Trex.slowJumpConfig : Trex.normalJumpConfig;
+    Trex.config = Object.assign(Trex.config, jumpConfig);
+
+    this.adjustAltGameConfigForSlowSpeed();
+  },
+
+  /**
+   * Enables the alternative game. Redefines the dino config.
+   * @param {Object} spritePos New positioning within image sprite.
+   */
+  enableAltGameMode: function(spritePos) {
+    this.altGameModeEnabled = true;
+    this.spritePos = spritePos;
+    const spriteDefinition = Runner.spriteDefinition['TREX'];
+
+    // Update animation frames.
+    Trex.animFrames.RUNNING.frames =
+        [spriteDefinition.RUNNING_1.x, spriteDefinition.RUNNING_2.x];
+    Trex.animFrames.CRASHED.frames = [spriteDefinition.CRASHED.x];
+
+    if (typeof spriteDefinition.JUMPING.x == 'object') {
+      Trex.animFrames.JUMPING.frames = spriteDefinition.JUMPING.x;
+    } else {
+      Trex.animFrames.JUMPING.frames = [spriteDefinition.JUMPING.x];
+    }
+
+    Trex.animFrames.DUCKING.frames =
+        [spriteDefinition.DUCKING_1.x, spriteDefinition.DUCKING_2.x];
+
+    // Update Trex config
+    Trex.config.GRAVITY = spriteDefinition.GRAVITY || Trex.config.GRAVITY;
+    Trex.config.HEIGHT = spriteDefinition.RUNNING_1.h,
+    Trex.config.INITIAL_JUMP_VELOCITY = spriteDefinition.INITIAL_JUMP_VELOCITY;
+    Trex.config.MAX_JUMP_HEIGHT = spriteDefinition.MAX_JUMP_HEIGHT;
+    Trex.config.MIN_JUMP_HEIGHT = spriteDefinition.MIN_JUMP_HEIGHT;
+    Trex.config.WIDTH = spriteDefinition.RUNNING_1.w;
+    Trex.config.WIDTH_CRASHED = spriteDefinition.CRASHED.w;
+    Trex.config.WIDTH_JUMP = spriteDefinition.JUMPING.w;
+    Trex.config.INVERT_JUMP = spriteDefinition.INVERT_JUMP;
+
+    this.adjustAltGameConfigForSlowSpeed(spriteDefinition.GRAVITY);
+    this.config = Trex.config;
+
+    // Adjust bottom horizon placement.
+    this.groundYPos = Runner.defaultDimensions.HEIGHT - this.config.HEIGHT -
+        Runner.spriteDefinition['BOTTOM_PAD'];
+    this.yPos = this.groundYPos;
+    this.reset();
+  },
+
+  /**
+   * Slow speeds adjustments for the alt game modes.
+   * @param {number=} opt_gravityValue
+   */
+  adjustAltGameConfigForSlowSpeed: function(opt_gravityValue) {
+    if (Runner.slowDown) {
+      if (opt_gravityValue) {
+        Trex.config.GRAVITY = opt_gravityValue / 1.5;
+      }
+      Trex.config.MIN_JUMP_HEIGHT *= 1.5;
+      Trex.config.MAX_JUMP_HEIGHT *= 1.5;
+      Trex.config.INITIAL_JUMP_VELOCITY =
+          Trex.config.INITIAL_JUMP_VELOCITY * 1.5;
+    }
+  },
+
+  /**
+   * Setter whether dino is flashing.
+   * @param {boolean} status
+   */
+  setFlashing: function(status) {
+    this.flashing = status;
+  },
+
+  /**
+   * Setter for the jump velocity.
+   * The approriate drop velocity is also set.
+   * @param {number} setting
+   */
+  setJumpVelocity(setting) {
+    this.config.INITIAL_JUMP_VELOCITY = -setting;
+    this.config.DROP_VELOCITY = -setting / 2;
+  },
+
+  /**
+   * Set the animation status.
+   * @param {!number} deltaTime
+   * @param {Trex.status=} opt_status Optional status to switch to.
+   */
+  update(deltaTime, opt_status) {
+    this.timer += deltaTime;
+
+    // Update the status.
+    if (opt_status) {
+      this.status = opt_status;
+      this.currentFrame = 0;
+      this.msPerFrame = Trex.animFrames[opt_status].msPerFrame;
+      this.currentAnimFrames = Trex.animFrames[opt_status].frames;
+
+      if (opt_status === Trex.status.WAITING) {
+        this.animStartTime = getTimeStamp();
+        this.setBlinkDelay();
+      }
+    }
+    // Game intro animation, T-rex moves in from the left.
+    if (this.playingIntro && this.xPos < this.config.START_X_POS) {
+      this.xPos += Math.round((this.config.START_X_POS /
+          this.config.INTRO_DURATION) * deltaTime);
+      this.xInitialPos = this.xPos;
+    }
+
+    if (this.status === Trex.status.WAITING) {
+      this.blink(getTimeStamp());
+    } else {
+      this.draw(this.currentAnimFrames[this.currentFrame], 0);
+    }
+
+    // Update the frame position.
+    if (!this.flashing && this.timer >= this.msPerFrame) {
+      this.currentFrame = this.currentFrame ==
+          this.currentAnimFrames.length - 1 ? 0 : this.currentFrame + 1;
+      this.timer = 0;
+    }
+
+    // Speed drop becomes duck if the down key is still being pressed.
+    if (this.speedDrop && this.yPos === this.groundYPos) {
+      this.speedDrop = false;
+      this.setDuck(true);
+    }
+  },
+
+  /**
+   * Draw the t-rex to a particular position.
+   * @param {number} x
+   * @param {number} y
+   */
+  draw(x, y) {
+    let sourceX = x;
+    let sourceY = y;
+    let sourceWidth = this.ducking && this.status !== Trex.status.CRASHED ?
+        this.config.WIDTH_DUCK :
+        this.config.WIDTH;
+    let sourceHeight = this.config.HEIGHT;
+    const outputHeight = sourceHeight;
+    const outputWidth =
+        this.altGameModeEnabled && this.status == Trex.status.CRASHED ?
+        this.config.WIDTH_CRASHED :
+        this.config.WIDTH;
+
+    let jumpOffset = Runner.spriteDefinition.TREX.JUMPING.xOffset;
+
+    // Width of sprite can change on jump or crashed.
+    if (this.altGameModeEnabled) {
+      if (this.jumping && this.status !== Trex.status.CRASHED) {
+        sourceWidth = this.config.WIDTH_JUMP;
+      } else if (this.status == Trex.status.CRASHED) {
+        sourceWidth = this.config.WIDTH_CRASHED;
+      }
+    }
+
+    if (IS_HIDPI) {
+      sourceX *= 2;
+      sourceY *= 2;
+      sourceWidth *= 2;
+      sourceHeight *= 2;
+      jumpOffset *= 2;
+    }
+
+    // Adjustments for sprite sheet position.
+    sourceX += this.spritePos.x;
+    sourceY += this.spritePos.y;
+
+    // Flashing.
+    if (this.flashing) {
+      if (this.timer < this.config.FLASH_ON) {
+        this.canvasCtx.globalAlpha = 0.5;
+      } else if (this.timer > this.config.FLASH_OFF) {
+        this.timer = 0;
+      }
+    }
+
+    // Ducking.
+    if (this.ducking && this.status !== Trex.status.CRASHED) {
+      this.canvasCtx.drawImage(Runner.imageSprite, sourceX, sourceY,
+          sourceWidth, sourceHeight,
+          this.xPos, this.yPos,
+          this.config.WIDTH_DUCK, outputHeight);
+    } else if (
+        this.altGameModeEnabled && this.jumping &&
+        this.status !== Trex.status.CRASHED) {
+      // Jumping with adjustments.
+      this.canvasCtx.drawImage(
+          Runner.imageSprite, sourceX, sourceY, sourceWidth, sourceHeight,
+          this.xPos - jumpOffset, this.yPos, this.config.WIDTH_JUMP,
+          outputHeight);
+    } else {
+      // Crashed whilst ducking. Trex is standing up so needs adjustment.
+      if (this.ducking && this.status === Trex.status.CRASHED) {
+        this.xPos++;
+      }
+      // Standing / running
+      this.canvasCtx.drawImage(
+          Runner.imageSprite, sourceX, sourceY, sourceWidth, sourceHeight,
+          this.xPos, this.yPos, outputWidth, outputHeight);
+    }
+    this.canvasCtx.globalAlpha = 1;
+  },
+
+  /**
+   * Sets a random time for the blink to happen.
+   */
+  setBlinkDelay() {
+    this.blinkDelay = Math.ceil(Math.random() * Trex.BLINK_TIMING);
+  },
+
+  /**
+   * Make t-rex blink at random intervals.
+   * @param {number} time Current time in milliseconds.
+   */
+  blink(time) {
+    const deltaTime = time - this.animStartTime;
+
+    if (deltaTime >= this.blinkDelay) {
+      this.draw(this.currentAnimFrames[this.currentFrame], 0);
+
+      if (this.currentFrame === 1) {
+        // Set new random delay to blink.
+        this.setBlinkDelay();
+        this.animStartTime = time;
+        this.blinkCount++;
+      }
+    }
+  },
+
+  /**
+   * Initialise a jump.
+   * @param {number} speed
+   */
+  startJump(speed) {
+    if (!this.jumping) {
+      this.update(0, Trex.status.JUMPING);
+      // Tweak the jump velocity based on the speed.
+      this.jumpVelocity = this.config.INITIAL_JUMP_VELOCITY - (speed / 10);
+      this.jumping = true;
+      this.reachedMinHeight = false;
+      this.speedDrop = false;
+
+      if (this.config.INVERT_JUMP) {
+        this.minJumpHeight = this.groundYPos + this.config.MIN_JUMP_HEIGHT;
+      }
+    }
+  },
+
+  /**
+   * Jump is complete, falling down.
+   */
+  endJump() {
+    if (this.reachedMinHeight &&
+        this.jumpVelocity < this.config.DROP_VELOCITY) {
+      this.jumpVelocity = this.config.DROP_VELOCITY;
+    }
+  },
+
+  /**
+   * Update frame for a jump.
+   * @param {number} deltaTime
+   */
+  updateJump(deltaTime) {
+    const msPerFrame = Trex.animFrames[this.status].msPerFrame;
+    const framesElapsed = deltaTime / msPerFrame;
+
+    // Speed drop makes Trex fall faster.
+    if (this.speedDrop) {
+      this.yPos += Math.round(this.jumpVelocity *
+          this.config.SPEED_DROP_COEFFICIENT * framesElapsed);
+    } else if (this.config.INVERT_JUMP) {
+      this.yPos -= Math.round(this.jumpVelocity * framesElapsed);
+    } else {
+      this.yPos += Math.round(this.jumpVelocity * framesElapsed);
+    }
+
+    this.jumpVelocity += this.config.GRAVITY * framesElapsed;
+
+    // Minimum height has been reached.
+    if (this.config.INVERT_JUMP && (this.yPos > this.minJumpHeight) ||
+        !this.config.INVERT_JUMP && (this.yPos < this.minJumpHeight) ||
+        this.speedDrop) {
+      this.reachedMinHeight = true;
+    }
+
+    // Reached max height.
+    if (this.config.INVERT_JUMP && (this.yPos > -this.config.MAX_JUMP_HEIGHT) ||
+        !this.config.INVERT_JUMP && (this.yPos < this.config.MAX_JUMP_HEIGHT) ||
+        this.speedDrop) {
+      this.endJump();
+    }
+
+    // Back down at ground level. Jump completed.
+    if ((this.config.INVERT_JUMP && this.yPos) < this.groundYPos ||
+        (!this.config.INVERT_JUMP && this.yPos) > this.groundYPos) {
+      this.reset();
+      this.jumpCount++;
+
+      if (Runner.audioCues) {
+        Runner.generatedSoundFx.loopFootSteps();
+      }
+    }
+  },
+
+  /**
+   * Set the speed drop. Immediately cancels the current jump.
+   */
+  setSpeedDrop() {
+    this.speedDrop = true;
+    this.jumpVelocity = 1;
+  },
+
+  /**
+   * @param {boolean} isDucking
+   */
+  setDuck(isDucking) {
+    if (isDucking && this.status !== Trex.status.DUCKING) {
+      this.update(0, Trex.status.DUCKING);
+      this.ducking = true;
+    } else if (this.status === Trex.status.DUCKING) {
+      this.update(0, Trex.status.RUNNING);
+      this.ducking = false;
+    }
+  },
+
+  /**
+   * Reset the t-rex to running at start of game.
+   */
+  reset() {
+    this.xPos = this.xInitialPos;
+    this.yPos = this.groundYPos;
+    this.jumpVelocity = 0;
+    this.jumping = false;
+    this.ducking = false;
+    this.update(0, Trex.status.RUNNING);
+    this.midair = false;
+    this.speedDrop = false;
+    this.jumpCount = 0;
+  },
+};
+
+
+//******************************************************************************
+
+/**
+ * Handles displaying the distance meter.
+ * @param {!HTMLCanvasElement} canvas
+ * @param {Object} spritePos Image position in sprite.
+ * @param {number} canvasWidth
+ * @constructor
+ */
+function DistanceMeter(canvas, spritePos, canvasWidth) {
+  this.canvas = canvas;
+  this.canvasCtx =
+      /** @type {CanvasRenderingContext2D} */ (canvas.getContext('2d'));
+  this.image = Runner.imageSprite;
+  this.spritePos = spritePos;
+  this.x = 0;
+  this.y = 5;
+
+  this.currentDistance = 0;
+  this.maxScore = 0;
+  this.highScore = '0';
+  this.container = null;
+
+  this.digits = [];
+  this.achievement = false;
+  this.defaultString = '';
+  this.flashTimer = 0;
+  this.flashIterations = 0;
+  this.invertTrigger = false;
+  this.flashingRafId = null;
+  this.highScoreBounds = {};
+  this.highScoreFlashing = false;
+
+  this.config = DistanceMeter.config;
+  this.maxScoreUnits = this.config.MAX_DISTANCE_UNITS;
+  this.canvasWidth = canvasWidth;
+  this.init(canvasWidth);
+}
+
+
+/**
+ * @enum {number}
+ */
+DistanceMeter.dimensions = {
+  WIDTH: 10,
+  HEIGHT: 13,
+  DEST_WIDTH: 11,
+};
+
+
+/**
+ * Y positioning of the digits in the sprite sheet.
+ * X position is always 0.
+ * @type {Array<number>}
+ */
+DistanceMeter.yPos = [0, 13, 27, 40, 53, 67, 80, 93, 107, 120];
+
+
+/**
+ * Distance meter config.
+ * @enum {number}
+ */
+DistanceMeter.config = {
+  // Number of digits.
+  MAX_DISTANCE_UNITS: 5,
+
+  // Distance that causes achievement animation.
+  ACHIEVEMENT_DISTANCE: 100,
+
+  // Used for conversion from pixel distance to a scaled unit.
+  COEFFICIENT: 0.025,
+
+  // Flash duration in milliseconds.
+  FLASH_DURATION: 1000 / 4,
+
+  // Flash iterations for achievement animation.
+  FLASH_ITERATIONS: 3,
+
+  // Padding around the high score hit area.
+  HIGH_SCORE_HIT_AREA_PADDING: 4,
+};
+
+
+DistanceMeter.prototype = {
+  /**
+   * Initialise the distance meter to '00000'.
+   * @param {number} width Canvas width in px.
+   */
+  init(width) {
+    let maxDistanceStr = '';
+
+    this.calcXPos(width);
+    this.maxScore = this.maxScoreUnits;
+    for (let i = 0; i < this.maxScoreUnits; i++) {
+      this.draw(i, 0);
+      this.defaultString += '0';
+      maxDistanceStr += '9';
+    }
+
+    this.maxScore = parseInt(maxDistanceStr, 10);
+  },
+
+  /**
+   * Calculate the xPos in the canvas.
+   * @param {number} canvasWidth
+   */
+  calcXPos(canvasWidth) {
+    this.x = canvasWidth - (DistanceMeter.dimensions.DEST_WIDTH *
+        (this.maxScoreUnits + 1));
+  },
+
+  /**
+   * Draw a digit to canvas.
+   * @param {number} digitPos Position of the digit.
+   * @param {number} value Digit value 0-9.
+   * @param {boolean=} opt_highScore Whether drawing the high score.
+   */
+  draw(digitPos, value, opt_highScore) {
+    let sourceWidth = DistanceMeter.dimensions.WIDTH;
+    let sourceHeight = DistanceMeter.dimensions.HEIGHT;
+    let sourceX = DistanceMeter.dimensions.WIDTH * value;
+    let sourceY = 0;
+
+    const targetX = digitPos * DistanceMeter.dimensions.DEST_WIDTH;
+    const targetY = this.y;
+    const targetWidth = DistanceMeter.dimensions.WIDTH;
+    const targetHeight = DistanceMeter.dimensions.HEIGHT;
+
+    // For high DPI we 2x source values.
+    if (IS_HIDPI) {
+      sourceWidth *= 2;
+      sourceHeight *= 2;
+      sourceX *= 2;
+    }
+
+    sourceX += this.spritePos.x;
+    sourceY += this.spritePos.y;
+
+    this.canvasCtx.save();
+
+    if (IS_RTL) {
+      if (opt_highScore) {
+        this.canvasCtx.translate(
+            this.canvasWidth -
+                (DistanceMeter.dimensions.WIDTH * (this.maxScoreUnits + 3)),
+            this.y);
+      } else {
+        this.canvasCtx.translate(
+            this.canvasWidth - DistanceMeter.dimensions.WIDTH, this.y);
+      }
+      this.canvasCtx.scale(-1, 1);
+    } else {
+      const highScoreX =
+          this.x - (this.maxScoreUnits * 2) * DistanceMeter.dimensions.WIDTH;
+      if (opt_highScore) {
+        this.canvasCtx.translate(highScoreX, this.y);
+      } else {
+        this.canvasCtx.translate(this.x, this.y);
+      }
+    }
+
+    this.canvasCtx.drawImage(
+        this.image,
+        sourceX,
+        sourceY,
+        sourceWidth,
+        sourceHeight,
+        targetX,
+        targetY,
+        targetWidth,
+        targetHeight,
+    );
+
+    this.canvasCtx.restore();
+  },
+
+  /**
+   * Covert pixel distance to a 'real' distance.
+   * @param {number} distance Pixel distance ran.
+   * @return {number} The 'real' distance ran.
+   */
+  getActualDistance(distance) {
+    return distance ? Math.round(distance * this.config.COEFFICIENT) : 0;
+  },
+
+  /**
+   * Update the distance meter.
+   * @param {number} distance
+   * @param {number} deltaTime
+   * @return {boolean} Whether the acheivement sound fx should be played.
+   */
+  update(deltaTime, distance) {
+    let paint = true;
+    let playSound = false;
+
+    if (!this.achievement) {
+      distance = this.getActualDistance(distance);
+      // Score has gone beyond the initial digit count.
+      if (distance > this.maxScore && this.maxScoreUnits ==
+        this.config.MAX_DISTANCE_UNITS) {
+        this.maxScoreUnits++;
+        this.maxScore = parseInt(this.maxScore + '9', 10);
+      } else {
+        this.distance = 0;
+      }
+
+      if (distance > 0) {
+        // Achievement unlocked.
+        if (distance % this.config.ACHIEVEMENT_DISTANCE === 0) {
+          // Flash score and play sound.
+          this.achievement = true;
+          this.flashTimer = 0;
+          playSound = true;
+        }
+
+        // Create a string representation of the distance with leading 0.
+        const distanceStr = (this.defaultString +
+            distance).substr(-this.maxScoreUnits);
+        this.digits = distanceStr.split('');
+      } else {
+        this.digits = this.defaultString.split('');
+      }
+    } else {
+      // Control flashing of the score on reaching acheivement.
+      if (this.flashIterations <= this.config.FLASH_ITERATIONS) {
+        this.flashTimer += deltaTime;
+
+        if (this.flashTimer < this.config.FLASH_DURATION) {
+          paint = false;
+        } else if (this.flashTimer > this.config.FLASH_DURATION * 2) {
+          this.flashTimer = 0;
+          this.flashIterations++;
+        }
+      } else {
+        this.achievement = false;
+        this.flashIterations = 0;
+        this.flashTimer = 0;
+      }
+    }
+
+    // Draw the digits if not flashing.
+    if (paint) {
+      for (let i = this.digits.length - 1; i >= 0; i--) {
+        this.draw(i, parseInt(this.digits[i], 10));
+      }
+    }
+
+    this.drawHighScore();
+    return playSound;
+  },
+
+  /**
+   * Draw the high score.
+   */
+  drawHighScore() {
+    if (parseInt(this.highScore, 10) > 0) {
+      this.canvasCtx.save();
+      this.canvasCtx.globalAlpha = .8;
+      for (let i = this.highScore.length - 1; i >= 0; i--) {
+        this.draw(i, parseInt(this.highScore[i], 10), true);
+      }
+      this.canvasCtx.restore();
+    }
+  },
+
+  /**
+   * Set the highscore as a array string.
+   * Position of char in the sprite: H - 10, I - 11.
+   * @param {number} distance Distance ran in pixels.
+   */
+  setHighScore(distance) {
+    distance = this.getActualDistance(distance);
+    const highScoreStr = (this.defaultString +
+        distance).substr(-this.maxScoreUnits);
+
+    this.highScore = ['10', '11', ''].concat(highScoreStr.split(''));
+  },
+
+
+  /**
+   * Whether a clicked is in the high score area.
+   * @param {Event} e Event object.
+   * @return {boolean} Whether the click was in the high score bounds.
+   */
+  hasClickedOnHighScore(e) {
+    let x = 0;
+    let y = 0;
+
+    if (e.touches) {
+      // Bounds for touch differ from pointer.
+      const canvasBounds = this.canvas.getBoundingClientRect();
+      x = e.touches[0].clientX - canvasBounds.left;
+      y = e.touches[0].clientY - canvasBounds.top;
+    } else {
+      x = e.offsetX;
+      y = e.offsetY;
+    }
+
+    this.highScoreBounds = this.getHighScoreBounds();
+    return x >= this.highScoreBounds.x && x <=
+        this.highScoreBounds.x + this.highScoreBounds.width &&
+        y >= this.highScoreBounds.y && y <=
+        this.highScoreBounds.y + this.highScoreBounds.height;
+  },
+
+  /**
+   * Get the bounding box for the high score.
+   * @return {Object} Object with x, y, width and height properties.
+   */
+  getHighScoreBounds() {
+    return {
+      x: (this.x - (this.maxScoreUnits * 2) * DistanceMeter.dimensions.WIDTH) -
+          DistanceMeter.config.HIGH_SCORE_HIT_AREA_PADDING,
+      y: this.y,
+      width: DistanceMeter.dimensions.WIDTH * (this.highScore.length + 1) +
+          DistanceMeter.config.HIGH_SCORE_HIT_AREA_PADDING,
+      height: DistanceMeter.dimensions.HEIGHT +
+          (DistanceMeter.config.HIGH_SCORE_HIT_AREA_PADDING * 2),
+    };
+  },
+
+  /**
+   * Animate flashing the high score to indicate ready for resetting.
+   * The flashing stops following this.config.FLASH_ITERATIONS x 2 flashes.
+   */
+  flashHighScore() {
+    const now = getTimeStamp();
+    const deltaTime = now - (this.frameTimeStamp || now);
+    let paint = true;
+    this.frameTimeStamp = now;
+
+    // Reached the max number of flashes.
+    if (this.flashIterations > this.config.FLASH_ITERATIONS * 2) {
+      this.cancelHighScoreFlashing();
+      return;
+    }
+
+    this.flashTimer += deltaTime;
+
+    if (this.flashTimer < this.config.FLASH_DURATION) {
+      paint = false;
+    } else if (this.flashTimer > this.config.FLASH_DURATION * 2) {
+      this.flashTimer = 0;
+      this.flashIterations++;
+    }
+
+    if (paint) {
+      this.drawHighScore();
+    } else {
+      this.clearHighScoreBounds();
+    }
+    // Frame update.
+    this.flashingRafId =
+        requestAnimationFrame(this.flashHighScore.bind(this));
+  },
+
+  /**
+   * Draw empty rectangle over high score.
+   */
+  clearHighScoreBounds() {
+    this.canvasCtx.save();
+    this.canvasCtx.fillStyle = '#fff';
+    this.canvasCtx.rect(this.highScoreBounds.x, this.highScoreBounds.y,
+        this.highScoreBounds.width, this.highScoreBounds.height);
+    this.canvasCtx.fill();
+    this.canvasCtx.restore();
+  },
+
+  /**
+   * Starts the flashing of the high score.
+   */
+  startHighScoreFlashing() {
+    this.highScoreFlashing = true;
+    this.flashHighScore();
+  },
+
+  /**
+   * Whether high score is flashing.
+   * @return {boolean}
+   */
+  isHighScoreFlashing() {
+    return this.highScoreFlashing;
+  },
+
+  /**
+   * Stop flashing the high score.
+   */
+  cancelHighScoreFlashing() {
+    if (this.flashingRafId) {
+      cancelAnimationFrame(this.flashingRafId);
+    }
+    this.flashIterations = 0;
+    this.flashTimer = 0;
+    this.highScoreFlashing = false;
+    this.clearHighScoreBounds();
+    this.drawHighScore();
+  },
+
+  /**
+   * Clear the high score.
+   */
+  resetHighScore() {
+    this.setHighScore(0);
+    this.cancelHighScoreFlashing();
+  },
+
+  /**
+   * Reset the distance meter back to '00000'.
+   */
+  reset() {
+    this.update(0, 0);
+    this.achievement = false;
+  },
+};
+
+
+//******************************************************************************
+
+/**
+ * Cloud background item.
+ * Similar to an obstacle object but without collision boxes.
+ * @param {HTMLCanvasElement} canvas Canvas element.
+ * @param {Object} spritePos Position of image in sprite.
+ * @param {number} containerWidth
+ * @constructor
+ */
+function Cloud(canvas, spritePos, containerWidth) {
+  this.canvas = canvas;
+  this.canvasCtx =
+      /** @type {CanvasRenderingContext2D} */ (this.canvas.getContext('2d'));
+  this.spritePos = spritePos;
+  this.containerWidth = containerWidth;
+  this.xPos = containerWidth;
+  this.yPos = 0;
+  this.remove = false;
+  this.gap =
+      getRandomNum(Cloud.config.MIN_CLOUD_GAP, Cloud.config.MAX_CLOUD_GAP);
+
+  this.init();
+}
+
+
+/**
+ * Cloud object config.
+ * @enum {number}
+ */
+Cloud.config = {
+  HEIGHT: 14,
+  MAX_CLOUD_GAP: 400,
+  MAX_SKY_LEVEL: 30,
+  MIN_CLOUD_GAP: 100,
+  MIN_SKY_LEVEL: 71,
+  WIDTH: 46,
+};
+
+
+Cloud.prototype = {
+  /**
+   * Initialise the cloud. Sets the Cloud height.
+   */
+  init() {
+    this.yPos = getRandomNum(Cloud.config.MAX_SKY_LEVEL,
+        Cloud.config.MIN_SKY_LEVEL);
+    this.draw();
+  },
+
+  /**
+   * Draw the cloud.
+   */
+  draw() {
+    this.canvasCtx.save();
+    let sourceWidth = Cloud.config.WIDTH;
+    let sourceHeight = Cloud.config.HEIGHT;
+    const outputWidth = sourceWidth;
+    const outputHeight = sourceHeight;
+    if (IS_HIDPI) {
+      sourceWidth = sourceWidth * 2;
+      sourceHeight = sourceHeight * 2;
+    }
+
+    this.canvasCtx.drawImage(Runner.imageSprite, this.spritePos.x,
+        this.spritePos.y,
+        sourceWidth, sourceHeight,
+        this.xPos, this.yPos,
+        outputWidth, outputHeight);
+
+    this.canvasCtx.restore();
+  },
+
+  /**
+   * Update the cloud position.
+   * @param {number} speed
+   */
+  update(speed) {
+    if (!this.remove) {
+      this.xPos -= Math.ceil(speed);
+      this.draw();
+
+      // Mark as removeable if no longer in the canvas.
+      if (!this.isVisible()) {
+        this.remove = true;
+      }
+    }
+  },
+
+  /**
+   * Check if the cloud is visible on the stage.
+   * @return {boolean}
+   */
+  isVisible() {
+    return this.xPos + Cloud.config.WIDTH > 0;
+  },
+};
+
+
+/**
+ * Background item.
+ * Similar to cloud, without random y position.
+ * @param {HTMLCanvasElement} canvas Canvas element.
+ * @param {Object} spritePos Position of image in sprite.
+ * @param {number} containerWidth
+ * @param {string} type Element type.
+ * @constructor
+ */
+function BackgroundEl(canvas, spritePos, containerWidth, type) {
+  this.canvas = canvas;
+  this.canvasCtx =
+      /** @type {CanvasRenderingContext2D} */ (this.canvas.getContext('2d'));
+  this.spritePos = spritePos;
+  this.containerWidth = containerWidth;
+  this.xPos = containerWidth;
+  this.yPos = 0;
+  this.remove = false;
+  this.type = type;
+  this.gap =
+      getRandomNum(BackgroundEl.config.MIN_GAP, BackgroundEl.config.MAX_GAP);
+  this.animTimer = 0;
+  this.switchFrames = false;
+
+  this.spriteConfig = {};
+  this.init();
+}
+
+/**
+ * Background element object config.
+ * Real values assigned when game type changes.
+ * @enum {number}
+ */
+BackgroundEl.config = {
+  MAX_BG_ELS: 0,
+  MAX_GAP: 0,
+  MIN_GAP: 0,
+  POS: 0,
+  SPEED: 0,
+  Y_POS: 0,
+  MS_PER_FRAME: 0,  // only needed when BACKGROUND_EL.FIXED is true
+};
+
+
+BackgroundEl.prototype = {
+  /**
+   * Initialise the element setting the y position.
+   */
+  init() {
+    this.spriteConfig = Runner.spriteDefinition.BACKGROUND_EL[this.type];
+    if (this.spriteConfig.FIXED) {
+      this.xPos = this.spriteConfig.FIXED_X_POS;
+    }
+    this.yPos = BackgroundEl.config.Y_POS - this.spriteConfig.HEIGHT +
+        this.spriteConfig.OFFSET;
+    this.draw();
+  },
+
+  /**
+   * Draw the element.
+   */
+  draw() {
+    this.canvasCtx.save();
+    let sourceWidth = this.spriteConfig.WIDTH;
+    let sourceHeight = this.spriteConfig.HEIGHT;
+    let sourceX = this.spriteConfig.X_POS;
+    const outputWidth = sourceWidth;
+    const outputHeight = sourceHeight;
+
+    if (IS_HIDPI) {
+      sourceWidth *= 2;
+      sourceHeight *= 2;
+      sourceX *= 2;
+    }
+
+    this.canvasCtx.drawImage(
+        Runner.imageSprite, sourceX, this.spritePos.y, sourceWidth,
+        sourceHeight, this.xPos, this.yPos, outputWidth, outputHeight);
+
+    this.canvasCtx.restore();
+  },
+
+  /**
+   * Update the background element position.
+   * @param {number} speed
+   */
+  update(speed) {
+    if (!this.remove) {
+      if (this.spriteConfig.FIXED) {
+        this.animTimer += speed;
+        if (this.animTimer > BackgroundEl.config.MS_PER_FRAME) {
+          this.animTimer = 0;
+          this.switchFrames = !this.switchFrames;
+        }
+
+        if (this.spriteConfig.FIXED_Y_POS_1 &&
+            this.spriteConfig.FIXED_Y_POS_2) {
+          this.yPos = this.switchFrames ? this.spriteConfig.FIXED_Y_POS_1 :
+                                          this.spriteConfig.FIXED_Y_POS_2;
+        }
+      } else {
+        // Fixed speed, regardless of actual game speed.
+        this.xPos -= BackgroundEl.config.SPEED;
+      }
+      this.draw();
+
+      // Mark as removable if no longer in the canvas.
+      if (!this.isVisible()) {
+        this.remove = true;
+      }
+    }
+  },
+
+  /**
+   * Check if the element is visible on the stage.
+   * @return {boolean}
+   */
+  isVisible() {
+    return this.xPos + this.spriteConfig.WIDTH > 0;
+  },
+};
+
+
+
+//******************************************************************************
+
+/**
+ * Nightmode shows a moon and stars on the horizon.
+ * @param {HTMLCanvasElement} canvas
+ * @param {number} spritePos
+ * @param {number} containerWidth
+ * @constructor
+ */
+function NightMode(canvas, spritePos, containerWidth) {
+  this.spritePos = spritePos;
+  this.canvas = canvas;
+  this.canvasCtx =
+      /** @type {CanvasRenderingContext2D} */ (canvas.getContext('2d'));
+  this.xPos = containerWidth - 50;
+  this.yPos = 30;
+  this.currentPhase = 0;
+  this.opacity = 0;
+  this.containerWidth = containerWidth;
+  this.stars = [];
+  this.drawStars = false;
+  this.placeStars();
+}
+
+/**
+ * @enum {number}
+ */
+NightMode.config = {
+  FADE_SPEED: 0.035,
+  HEIGHT: 40,
+  MOON_SPEED: 0.25,
+  NUM_STARS: 2,
+  STAR_SIZE: 9,
+  STAR_SPEED: 0.3,
+  STAR_MAX_Y: 70,
+  WIDTH: 20,
+};
+
+NightMode.phases = [140, 120, 100, 60, 40, 20, 0];
+
+NightMode.prototype = {
+  /**
+   * Update moving moon, changing phases.
+   * @param {boolean} activated Whether night mode is activated.
+   */
+  update(activated) {
+    // Moon phase.
+    if (activated && this.opacity === 0) {
+      this.currentPhase++;
+
+      if (this.currentPhase >= NightMode.phases.length) {
+        this.currentPhase = 0;
+      }
+    }
+
+    // Fade in / out.
+    if (activated && (this.opacity < 1 || this.opacity === 0)) {
+      this.opacity += NightMode.config.FADE_SPEED;
+    } else if (this.opacity > 0) {
+      this.opacity -= NightMode.config.FADE_SPEED;
+    }
+
+    // Set moon positioning.
+    if (this.opacity > 0) {
+      this.xPos = this.updateXPos(this.xPos, NightMode.config.MOON_SPEED);
+
+      // Update stars.
+      if (this.drawStars) {
+        for (let i = 0; i < NightMode.config.NUM_STARS; i++) {
+          this.stars[i].x =
+              this.updateXPos(this.stars[i].x, NightMode.config.STAR_SPEED);
+        }
+      }
+      this.draw();
+    } else {
+      this.opacity = 0;
+      this.placeStars();
+    }
+    this.drawStars = true;
+  },
+
+  updateXPos(currentPos, speed) {
+    if (currentPos < -NightMode.config.WIDTH) {
+      currentPos = this.containerWidth;
+    } else {
+      currentPos -= speed;
+    }
+    return currentPos;
+  },
+
+  draw() {
+    let moonSourceWidth = this.currentPhase === 3 ? NightMode.config.WIDTH * 2 :
+                                                    NightMode.config.WIDTH;
+    let moonSourceHeight = NightMode.config.HEIGHT;
+    let moonSourceX = this.spritePos.x + NightMode.phases[this.currentPhase];
+    const moonOutputWidth = moonSourceWidth;
+    let starSize = NightMode.config.STAR_SIZE;
+    let starSourceX = spriteDefinitionByType.original.LDPI.STAR.x;
+
+    if (IS_HIDPI) {
+      moonSourceWidth *= 2;
+      moonSourceHeight *= 2;
+      moonSourceX = this.spritePos.x +
+          (NightMode.phases[this.currentPhase] * 2);
+      starSize *= 2;
+      starSourceX = spriteDefinitionByType.original.HDPI.STAR.x;
+    }
+
+    this.canvasCtx.save();
+    this.canvasCtx.globalAlpha = this.opacity;
+
+    // Stars.
+    if (this.drawStars) {
+      for (let i = 0; i < NightMode.config.NUM_STARS; i++) {
+        this.canvasCtx.drawImage(
+            Runner.origImageSprite, starSourceX, this.stars[i].sourceY,
+            starSize, starSize, Math.round(this.stars[i].x), this.stars[i].y,
+            NightMode.config.STAR_SIZE, NightMode.config.STAR_SIZE);
+      }
+    }
+
+    // Moon.
+    this.canvasCtx.drawImage(
+        Runner.origImageSprite, moonSourceX, this.spritePos.y, moonSourceWidth,
+        moonSourceHeight, Math.round(this.xPos), this.yPos, moonOutputWidth,
+        NightMode.config.HEIGHT);
+
+    this.canvasCtx.globalAlpha = 1;
+    this.canvasCtx.restore();
+  },
+
+  // Do star placement.
+  placeStars() {
+    const segmentSize = Math.round(this.containerWidth /
+        NightMode.config.NUM_STARS);
+
+    for (let i = 0; i < NightMode.config.NUM_STARS; i++) {
+      this.stars[i] = {};
+      this.stars[i].x = getRandomNum(segmentSize * i, segmentSize * (i + 1));
+      this.stars[i].y = getRandomNum(0, NightMode.config.STAR_MAX_Y);
+
+      if (IS_HIDPI) {
+        this.stars[i].sourceY = spriteDefinitionByType.original.HDPI.STAR.y +
+            NightMode.config.STAR_SIZE * 2 * i;
+      } else {
+        this.stars[i].sourceY = spriteDefinitionByType.original.LDPI.STAR.y +
+            NightMode.config.STAR_SIZE * i;
+      }
+    }
+  },
+
+  reset() {
+    this.currentPhase = 0;
+    this.opacity = 0;
+    this.update(false);
+  },
+
+};
+
+
+//******************************************************************************
+
+/**
+ * Horizon Line.
+ * Consists of two connecting lines. Randomly assigns a flat / bumpy horizon.
+ * @param {HTMLCanvasElement} canvas
+ * @param {Object} lineConfig Configuration object.
+ * @constructor
+ */
+function HorizonLine(canvas, lineConfig) {
+  let sourceX = lineConfig.SOURCE_X;
+  let sourceY = lineConfig.SOURCE_Y;
+
+  if (IS_HIDPI) {
+    sourceX *= 2;
+    sourceY *= 2;
+  }
+
+  this.spritePos = {x: sourceX, y: sourceY};
+  this.canvas = canvas;
+  this.canvasCtx =
+      /** @type {CanvasRenderingContext2D} */ (canvas.getContext('2d'));
+  this.sourceDimensions = {};
+  this.dimensions = lineConfig;
+
+  this.sourceXPos = [this.spritePos.x, this.spritePos.x +
+      this.dimensions.WIDTH];
+  this.xPos = [];
+  this.yPos = 0;
+  this.bumpThreshold = 0.5;
+
+  this.setSourceDimensions(lineConfig);
+  this.draw();
+}
+
+
+/**
+ * Horizon line dimensions.
+ * @enum {number}
+ */
+HorizonLine.dimensions = {
+  WIDTH: 600,
+  HEIGHT: 12,
+  YPOS: 127,
+};
+
+
+HorizonLine.prototype = {
+  /**
+   * Set the source dimensions of the horizon line.
+   */
+  setSourceDimensions(newDimensions) {
+    for (const dimension in newDimensions) {
+      if (dimension !== 'SOURCE_X' && dimension !== 'SOURCE_Y') {
+        if (IS_HIDPI) {
+          if (dimension !== 'YPOS') {
+            this.sourceDimensions[dimension] = newDimensions[dimension] * 2;
+          }
+        } else {
+          this.sourceDimensions[dimension] = newDimensions[dimension];
+        }
+        this.dimensions[dimension] = newDimensions[dimension];
+      }
+    }
+
+    this.xPos = [0, newDimensions.WIDTH];
+    this.yPos = newDimensions.YPOS;
+  },
+
+  /**
+   * Return the crop x position of a type.
+   */
+  getRandomType() {
+    return Math.random() > this.bumpThreshold ? this.dimensions.WIDTH : 0;
+  },
+
+  /**
+   * Draw the horizon line.
+   */
+  draw() {
+    this.canvasCtx.drawImage(Runner.imageSprite, this.sourceXPos[0],
+        this.spritePos.y,
+        this.sourceDimensions.WIDTH, this.sourceDimensions.HEIGHT,
+        this.xPos[0], this.yPos,
+        this.dimensions.WIDTH, this.dimensions.HEIGHT);
+
+    this.canvasCtx.drawImage(Runner.imageSprite, this.sourceXPos[1],
+        this.spritePos.y,
+        this.sourceDimensions.WIDTH, this.sourceDimensions.HEIGHT,
+        this.xPos[1], this.yPos,
+        this.dimensions.WIDTH, this.dimensions.HEIGHT);
+  },
+
+  /**
+   * Update the x position of an indivdual piece of the line.
+   * @param {number} pos Line position.
+   * @param {number} increment
+   */
+  updateXPos(pos, increment) {
+    const line1 = pos;
+    const line2 = pos === 0 ? 1 : 0;
+
+    this.xPos[line1] -= increment;
+    this.xPos[line2] = this.xPos[line1] + this.dimensions.WIDTH;
+
+    if (this.xPos[line1] <= -this.dimensions.WIDTH) {
+      this.xPos[line1] += this.dimensions.WIDTH * 2;
+      this.xPos[line2] = this.xPos[line1] - this.dimensions.WIDTH;
+      this.sourceXPos[line1] = this.getRandomType() + this.spritePos.x;
+    }
+  },
+
+  /**
+   * Update the horizon line.
+   * @param {number} deltaTime
+   * @param {number} speed
+   */
+  update(deltaTime, speed) {
+    const increment = Math.floor(speed * (FPS / 1000) * deltaTime);
+
+    if (this.xPos[0] <= 0) {
+      this.updateXPos(0, increment);
+    } else {
+      this.updateXPos(1, increment);
+    }
+    this.draw();
+  },
+
+  /**
+   * Reset horizon to the starting position.
+   */
+  reset() {
+    this.xPos[0] = 0;
+    this.xPos[1] = this.dimensions.WIDTH;
+  },
+};
+
+
+//******************************************************************************
+
+/**
+ * Horizon background class.
+ * @param {HTMLCanvasElement} canvas
+ * @param {Object} spritePos Sprite positioning.
+ * @param {Object} dimensions Canvas dimensions.
+ * @param {number} gapCoefficient
+ * @constructor
+ */
+function Horizon(canvas, spritePos, dimensions, gapCoefficient) {
+  this.canvas = canvas;
+  this.canvasCtx =
+      /** @type {CanvasRenderingContext2D} */ (this.canvas.getContext('2d'));
+  this.config = Horizon.config;
+  this.dimensions = dimensions;
+  this.gapCoefficient = gapCoefficient;
+  this.obstacles = [];
+  this.obstacleHistory = [];
+  this.horizonOffsets = [0, 0];
+  this.cloudFrequency = this.config.CLOUD_FREQUENCY;
+  this.spritePos = spritePos;
+  this.nightMode = null;
+  this.altGameModeActive = false;
+
+  // Cloud
+  this.clouds = [];
+  this.cloudSpeed = this.config.BG_CLOUD_SPEED;
+
+  // Background elements
+  this.backgroundEls = [];
+  this.lastEl = null;
+  this.backgroundSpeed = this.config.BG_CLOUD_SPEED;
+
+  // Horizon
+  this.horizonLine = null;
+  this.horizonLines = [];
+  this.init();
+}
+
+
+/**
+ * Horizon config.
+ * @enum {number}
+ */
+Horizon.config = {
+  BG_CLOUD_SPEED: 0.2,
+  BUMPY_THRESHOLD: .3,
+  CLOUD_FREQUENCY: .5,
+  HORIZON_HEIGHT: 16,
+  MAX_CLOUDS: 6,
+};
+
+
+Horizon.prototype = {
+  /**
+   * Initialise the horizon. Just add the line and a cloud. No obstacles.
+   */
+  init() {
+    Obstacle.types = spriteDefinitionByType.original.OBSTACLES;
+    this.addCloud();
+    // Multiple Horizon lines
+    for (let i = 0; i < Runner.spriteDefinition.LINES.length; i++) {
+      this.horizonLines.push(
+          new HorizonLine(this.canvas, Runner.spriteDefinition.LINES[i]));
+    }
+
+    this.nightMode = new NightMode(this.canvas, this.spritePos.MOON,
+        this.dimensions.WIDTH);
+  },
+
+  /**
+   * Update obstacle definitions based on the speed of the game.
+   */
+  adjustObstacleSpeed: function() {
+    for (let i = 0; i < Obstacle.types.length; i++) {
+      if (Runner.slowDown) {
+        Obstacle.types[i].multipleSpeed = Obstacle.types[i].multipleSpeed / 2;
+        Obstacle.types[i].minGap *= 1.5;
+        Obstacle.types[i].minSpeed = Obstacle.types[i].minSpeed / 2;
+
+        // Convert variable y position obstacles to fixed.
+        if (typeof (Obstacle.types[i].yPos) == 'object') {
+          Obstacle.types[i].yPos = Obstacle.types[i].yPos[0];
+          Obstacle.types[i].yPosMobile = Obstacle.types[i].yPos[0];
+        }
+      }
+    }
+  },
+
+  /**
+   * Update sprites to correspond to change in sprite sheet.
+   * @param {number} spritePos
+   */
+  enableAltGameMode: function(spritePos) {
+    // Clear existing horizon objects.
+    this.clouds = [];
+    this.backgroundEls = [];
+
+    this.altGameModeActive = true;
+    this.spritePos = spritePos;
+
+    Obstacle.types = Runner.spriteDefinition.OBSTACLES;
+    this.adjustObstacleSpeed();
+
+    Obstacle.MAX_GAP_COEFFICIENT = Runner.spriteDefinition.MAX_GAP_COEFFICIENT;
+    Obstacle.MAX_OBSTACLE_LENGTH = Runner.spriteDefinition.MAX_OBSTACLE_LENGTH;
+
+    BackgroundEl.config = Runner.spriteDefinition.BACKGROUND_EL_CONFIG;
+
+    this.horizonLines = [];
+    for (let i = 0; i < Runner.spriteDefinition.LINES.length; i++) {
+      this.horizonLines.push(
+          new HorizonLine(this.canvas, Runner.spriteDefinition.LINES[i]));
+    }
+    this.reset();
+  },
+
+  /**
+   * @param {number} deltaTime
+   * @param {number} currentSpeed
+   * @param {boolean} updateObstacles Used as an override to prevent
+   *     the obstacles from being updated / added. This happens in the
+   *     ease in section.
+   * @param {boolean} showNightMode Night mode activated.
+   */
+  update(deltaTime, currentSpeed, updateObstacles, showNightMode) {
+    this.runningTime += deltaTime;
+
+    if (this.altGameModeActive) {
+      this.updateBackgroundEls(deltaTime, currentSpeed);
+    }
+
+    for (let i = 0; i < this.horizonLines.length; i++) {
+      this.horizonLines[i].update(deltaTime, currentSpeed);
+    }
+
+    if (!this.altGameModeActive || Runner.spriteDefinition.HAS_CLOUDS) {
+      this.nightMode.update(showNightMode);
+      this.updateClouds(deltaTime, currentSpeed);
+    }
+
+    if (updateObstacles) {
+      this.updateObstacles(deltaTime, currentSpeed);
+    }
+  },
+
+  /**
+   * Update background element positions. Also handles creating new elements.
+   * @param {number} elSpeed
+   * @param {Array<Object>} bgElArray
+   * @param {number} maxBgEl
+   * @param {Function} bgElAddFunction
+   * @param {number} frequency
+   */
+  updateBackgroundEl(elSpeed, bgElArray, maxBgEl, bgElAddFunction, frequency) {
+    const numElements = bgElArray.length;
+
+    if (numElements) {
+      for (let i = numElements - 1; i >= 0; i--) {
+        bgElArray[i].update(elSpeed);
+      }
+
+      const lastEl = bgElArray[numElements - 1];
+
+      // Check for adding a new element.
+      if (numElements < maxBgEl &&
+          (this.dimensions.WIDTH - lastEl.xPos) > lastEl.gap &&
+          frequency > Math.random()) {
+        bgElAddFunction();
+      }
+    } else {
+      bgElAddFunction();
+    }
+  },
+
+  /**
+   * Update the cloud positions.
+   * @param {number} deltaTime
+   * @param {number} speed
+   */
+  updateClouds(deltaTime, speed) {
+    const elSpeed = this.cloudSpeed / 1000 * deltaTime * speed;
+    this.updateBackgroundEl(
+        elSpeed, this.clouds, this.config.MAX_CLOUDS, this.addCloud.bind(this),
+        this.cloudFrequency);
+
+    // Remove expired elements.
+    this.clouds = this.clouds.filter((obj) => !obj.remove);
+  },
+
+  /**
+   * Update the background element positions.
+   * @param {number} deltaTime
+   * @param {number} speed
+   */
+  updateBackgroundEls(deltaTime, speed) {
+    this.updateBackgroundEl(
+        deltaTime, this.backgroundEls, BackgroundEl.config.MAX_BG_ELS,
+        this.addBackgroundEl.bind(this), this.cloudFrequency);
+
+    // Remove expired elements.
+    this.backgroundEls = this.backgroundEls.filter((obj) => !obj.remove);
+  },
+
+  /**
+   * Update the obstacle positions.
+   * @param {number} deltaTime
+   * @param {number} currentSpeed
+   */
+  updateObstacles(deltaTime, currentSpeed) {
+    const updatedObstacles = this.obstacles.slice(0);
+
+    for (let i = 0; i < this.obstacles.length; i++) {
+      const obstacle = this.obstacles[i];
+      obstacle.update(deltaTime, currentSpeed);
+
+      // Clean up existing obstacles.
+      if (obstacle.remove) {
+        updatedObstacles.shift();
+      }
+    }
+    this.obstacles = updatedObstacles;
+
+    if (this.obstacles.length > 0) {
+      const lastObstacle = this.obstacles[this.obstacles.length - 1];
+
+      if (lastObstacle && !lastObstacle.followingObstacleCreated &&
+          lastObstacle.isVisible() &&
+          (lastObstacle.xPos + lastObstacle.width + lastObstacle.gap) <
+          this.dimensions.WIDTH) {
+        this.addNewObstacle(currentSpeed);
+        lastObstacle.followingObstacleCreated = true;
+      }
+    } else {
+      // Create new obstacles.
+      this.addNewObstacle(currentSpeed);
+    }
+  },
+
+  removeFirstObstacle() {
+    this.obstacles.shift();
+  },
+
+  /**
+   * Add a new obstacle.
+   * @param {number} currentSpeed
+   */
+  addNewObstacle(currentSpeed) {
+    const obstacleCount =
+        Obstacle.types[Obstacle.types.length - 1].type != 'COLLECTABLE' ||
+            (Runner.isAltGameModeEnabled() && !this.altGameModeActive ||
+             this.altGameModeActive) ?
+        Obstacle.types.length - 1 :
+        Obstacle.types.length - 2;
+    const obstacleTypeIndex =
+        obstacleCount > 0 ? getRandomNum(0, obstacleCount) : 0;
+    const obstacleType = Obstacle.types[obstacleTypeIndex];
+
+    // Check for multiples of the same type of obstacle.
+    // Also check obstacle is available at current speed.
+    if ((obstacleCount > 0 && this.duplicateObstacleCheck(obstacleType.type)) ||
+        currentSpeed < obstacleType.minSpeed) {
+      this.addNewObstacle(currentSpeed);
+    } else {
+      const obstacleSpritePos = this.spritePos[obstacleType.type];
+
+      this.obstacles.push(new Obstacle(
+          this.canvasCtx, obstacleType, obstacleSpritePos, this.dimensions,
+          this.gapCoefficient, currentSpeed, obstacleType.width,
+          this.altGameModeActive));
+
+      this.obstacleHistory.unshift(obstacleType.type);
+
+      if (this.obstacleHistory.length > 1) {
+        this.obstacleHistory.splice(Runner.config.MAX_OBSTACLE_DUPLICATION);
+      }
+    }
+  },
+
+  /**
+   * Returns whether the previous two obstacles are the same as the next one.
+   * Maximum duplication is set in config value MAX_OBSTACLE_DUPLICATION.
+   * @return {boolean}
+   */
+  duplicateObstacleCheck(nextObstacleType) {
+    let duplicateCount = 0;
+
+    for (let i = 0; i < this.obstacleHistory.length; i++) {
+      duplicateCount =
+          this.obstacleHistory[i] === nextObstacleType ? duplicateCount + 1 : 0;
+    }
+    return duplicateCount >= Runner.config.MAX_OBSTACLE_DUPLICATION;
+  },
+
+  /**
+   * Reset the horizon layer.
+   * Remove existing obstacles and reposition the horizon line.
+   */
+  reset() {
+    this.obstacles = [];
+    for (let l = 0; l < this.horizonLines.length; l++) {
+      this.horizonLines[l].reset();
+    }
+
+    this.nightMode.reset();
+  },
+
+  /**
+   * Update the canvas width and scaling.
+   * @param {number} width Canvas width.
+   * @param {number} height Canvas height.
+   */
+  resize(width, height) {
+    this.canvas.width = width;
+    this.canvas.height = height;
+  },
+
+  /**
+   * Add a new cloud to the horizon.
+   */
+  addCloud() {
+    this.clouds.push(new Cloud(this.canvas, this.spritePos.CLOUD,
+        this.dimensions.WIDTH));
+  },
+
+  /**
+   * Add a random background element to the horizon.
+   */
+  addBackgroundEl() {
+    const backgroundElTypes =
+        Object.keys(Runner.spriteDefinition.BACKGROUND_EL);
+
+    if (backgroundElTypes.length > 0) {
+      let index = getRandomNum(0, backgroundElTypes.length - 1);
+      let type = backgroundElTypes[index];
+
+      // Add variation if available.
+      while (type == this.lastEl && backgroundElTypes.length > 1) {
+        index = getRandomNum(0, backgroundElTypes.length - 1);
+        type = backgroundElTypes[index];
+      }
+
+      this.lastEl = type;
+      this.backgroundEls.push(new BackgroundEl(
+          this.canvas, this.spritePos.BACKGROUND_EL, this.dimensions.WIDTH,
+          type));
+    }
+  },
+};
+
+// Copyright 2013 The Chromium Authors
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+
+function toggleHelpBox() {
+  const helpBoxOuter = document.getElementById('details');
+  helpBoxOuter.classList.toggle(HIDDEN_CLASS);
+  const detailsButton = document.getElementById('details-button');
+  if (helpBoxOuter.classList.contains(HIDDEN_CLASS)) {
+    /** @suppress {missingProperties} */
+    detailsButton.innerText = detailsButton.detailsText;
+  } else {
+    /** @suppress {missingProperties} */
+    detailsButton.innerText = detailsButton.hideDetailsText;
+  }
+
+  // Details appears over the main content on small screens.
+  if (mobileNav) {
+    document.getElementById('main-content').classList.toggle(HIDDEN_CLASS);
+    const runnerContainer = document.querySelector('.runner-container');
+    if (runnerContainer) {
+      runnerContainer.classList.toggle(HIDDEN_CLASS);
+    }
+  }
+}
+
+function diagnoseErrors() {
+  if (window.errorPageController) {
+    window.errorPageController.diagnoseErrorsButtonClick();
+  }
+}
+
+// Subframes use a different layout but the same html file.  This is to make it
+// easier to support platforms that load the error page via different
+// mechanisms (Currently just iOS).
+let isSubFrame = false;
+if (window.top.location !== window.location) {
+  document.documentElement.setAttribute('subframe', '');
+  isSubFrame = true;
+}
+
+// Re-renders the error page using |strings| as the dictionary of values.
+// Used by NetErrorTabHelper to update DNS error pages with probe results.
+function updateForDnsProbe(strings) {
+  const context = new JsEvalContext(strings);
+  jstProcess(context, document.body);
+  onDocumentLoadOrUpdate();
+}
+
+// Adds an icon class to the list and removes classes previously set.
+function updateIconClass(newClass) {
+  const frameSelector = isSubFrame ? '#sub-frame-error' : '#main-frame-error';
+  const iconEl = document.querySelector(frameSelector + ' .icon');
+
+  if (iconEl.classList.contains(newClass)) {
+    return;
+  }
+
+  iconEl.className = 'icon ' + newClass;
+}
+
+// Implements button clicks.  This function is needed during the transition
+// between implementing these in trunk chromium and implementing them in iOS.
+function reloadButtonClick(url) {
+  if (window.errorPageController) {
+    // 
+
+    // 
+    window.errorPageController.reloadButtonClick();
+    // 
+  } else {
+    window.location = url;
+  }
+}
+
+function downloadButtonClick() {
+  if (window.errorPageController) {
+    window.errorPageController.downloadButtonClick();
+    const downloadButton = document.getElementById('download-button');
+    downloadButton.disabled = true;
+    /** @suppress {missingProperties} */
+    downloadButton.textContent = downloadButton.disabledText;
+
+    document.getElementById('download-link-wrapper')
+        .classList.add(HIDDEN_CLASS);
+    document.getElementById('download-link-clicked-wrapper')
+        .classList.remove(HIDDEN_CLASS);
+  }
+}
+
+function detailsButtonClick() {
+  if (window.errorPageController) {
+    window.errorPageController.detailsButtonClick();
+  }
+}
+// clang-format off
+// 
+
+function setAutoFetchState(scheduled, can_schedule) {
+  document.getElementById('cancel-save-page-button')
+      .classList.toggle(HIDDEN_CLASS, !scheduled);
+  document.getElementById('save-page-for-later-button')
+      .classList.toggle(HIDDEN_CLASS, scheduled || !can_schedule);
+}
+
+function savePageLaterClick() {
+  window.errorPageController.savePageForLater();
+  // savePageForLater will eventually trigger a call to setAutoFetchState() when
+  // it completes.
+}
+
+function cancelSavePageClick() {
+  window.errorPageController.cancelSavePage();
+  // setAutoFetchState is not called in response to cancelSavePage(), so do it
+  // now.
+  setAutoFetchState(false, true);
+}
+
+function toggleErrorInformationPopup() {
+  document.getElementById('error-information-popup-container')
+      .classList.toggle(HIDDEN_CLASS);
+}
+
+function launchDownloadsPage() {
+  window.errorPageController.launchDownloadsPage();
+}
+
+function toggleOfflineContentListVisibility(updatePref) {
+  if (!loadTimeData.valueExists('offlineContentList')) {
+    return;
+  }
+
+  const contentListElement = document.getElementById('offline-content-list');
+  const isVisible = !contentListElement.classList.toggle('list-hidden');
+
+  if (updatePref && window.errorPageController) {
+    window.errorPageController.listVisibilityChanged(isVisible);
+  }
+}
+
+// Called on document load, and from updateForDnsProbe().
+function onDocumentLoadOrUpdate() {
+  const downloadButtonVisible = loadTimeData.valueExists('downloadButton') &&
+      loadTimeData.getValue('downloadButton').msg;
+  const detailsButton = document.getElementById('details-button');
+
+  // If offline content suggestions will be visible, the usual buttons will not
+  // be presented.
+  const offlineContentVisible =
+      loadTimeData.valueExists('suggestedOfflineContentPresentation');
+  if (offlineContentVisible) {
+    document.querySelector('.nav-wrapper').classList.add(HIDDEN_CLASS);
+    detailsButton.classList.add(HIDDEN_CLASS);
+
+    document.getElementById('download-link').hidden = !downloadButtonVisible;
+    document.getElementById('download-links-wrapper')
+        .classList.remove(HIDDEN_CLASS);
+    document.getElementById('error-information-popup-container')
+        .classList.add('use-popup-container', HIDDEN_CLASS);
+    document.getElementById('error-information-button')
+        .classList.remove(HIDDEN_CLASS);
+  }
+
+  loadTimeData.valueExists('attemptAutoFetch') &&
+      loadTimeData.getValue('attemptAutoFetch');
+
+  const reloadButtonVisible = loadTimeData.valueExists('reloadButton') &&
+      loadTimeData.getValue('reloadButton').msg;
+
+  const reloadButton = document.getElementById('reload-button');
+  const downloadButton = document.getElementById('download-button');
+  if (reloadButton.style.display === 'none' &&
+      downloadButton.style.display === 'none') {
+    detailsButton.classList.add('singular');
+  }
+
+  // Show or hide control buttons.
+  const controlButtonDiv = document.getElementById('control-buttons');
+  controlButtonDiv.hidden =
+      offlineContentVisible || !(reloadButtonVisible || downloadButtonVisible);
+
+  const iconClass = loadTimeData.valueExists('iconClass') &&
+      loadTimeData.getValue('iconClass');
+
+  updateIconClass(iconClass);
+
+  if (!isSubFrame && iconClass === 'icon-offline') {
+    document.documentElement.classList.add('offline');
+    new Runner('.interstitial-wrapper');
+  }
+}
+
+function onDocumentLoad() {
+  // `loadTimeDataRaw` is injected to the `window` scope from C++.
+  loadTimeData.data = window.loadTimeDataRaw;
+  jstProcess(new JsEvalContext(window.loadTimeDataRaw), document.body);
+
+  // Sets up the proper button layout for the current platform.
+  const buttonsDiv = document.getElementById('buttons');
+  {
+    buttonsDiv.classList.add('suggested-left');
+  }
+
+  onDocumentLoadOrUpdate();
+}
+
+// Expose methods that are triggered either
+//  - By `onclick=...` handlers in the HTML code, OR
+//  - By `href="javascript:..."` in localized links.
+//  - By inected JS code coming from C++
+//
+//  since those need to be available on the 'window' object.
+Object.assign(window, {
+  cancelSavePageClick,
+  detailsButtonClick,
+  diagnoseErrors,
+  downloadButtonClick,
+  launchDownloadsPage,
+  reloadButtonClick,
+  savePageLaterClick,
+  toggleErrorInformationPopup,
+  toggleHelpBox,
+  toggleOfflineContentListVisibility,
+  updateForDnsProbe,
+});
+
+document.addEventListener('DOMContentLoaded', onDocumentLoad);
+//# sourceMappingURL=neterror.rollup.js.map
+</script>
+</head>
+<body class="neterror" style="font-family: &#39;Segoe UI&#39;, Tahoma, sans-serif; font-size: 75%" jstcache="0">
+  <div id="main-frame-error" class="interstitial-wrapper" jstcache="0">
+    <div id="main-content" jstcache="0">
+      <div class="icon" jstcache="0"></div>
+      <div id="main-message" jstcache="0">
+        <h1 jstcache="0">
+          <span jsselect="heading" jsvalues=".innerHTML:msg" jstcache="9"><span jscontent="hostName" jstcache="22">td.doubleclick.net</span> is blocked</span>
+          <a id="error-information-button" class="hidden" onclick="toggleErrorInformationPopup();" jstcache="0"></a>
+        </h1>
+        <p jsselect="summary" jsvalues=".innerHTML:msg" jstcache="1">This content is blocked. Contact the site owner to fix the issue.</p>
+        <!--The suggestion list and error code are normally presented inline,
+          in which case error-information-popup-* divs have no effect. When
+          error-information-popup-container has the use-popup-container class, this
+          information is provided in a popup instead.-->
+        <div id="error-information-popup-container" jstcache="0">
+          <div id="error-information-popup" jstcache="0">
+            <div id="error-information-popup-box" jstcache="0">
+              <div id="error-information-popup-content" jstcache="0">
+                <div id="suggestions-list" style="display:none" jsdisplay="(suggestionsSummaryList &amp;&amp; suggestionsSummaryList.length)" jstcache="16">
+                  <p jsvalues=".innerHTML:suggestionsSummaryListHeader" jstcache="18"></p>
+                  <ul jsvalues=".className:suggestionsSummaryList.length == 1 ? &#39;single-suggestion&#39; : &#39;&#39;" jstcache="19">
+                    <li jsselect="suggestionsSummaryList" jsvalues=".innerHTML:summary" jstcache="21"></li>
+                  </ul>
+                </div>
+                <div class="error-code" jscontent="errorCode" jstcache="17">ERR_BLOCKED_BY_CSP</div>
+                <p id="error-information-popup-close" jstcache="0">
+                  <a class="link-button" jscontent="closeDescriptionPopup" onclick="toggleErrorInformationPopup();" jstcache="20">null</a>
+                </p>
+              </div>
+            </div>
+          </div>
+        </div>
+        <div id="download-links-wrapper" class="hidden" jstcache="0">
+          <div id="download-link-wrapper" jstcache="0">
+            <a id="download-link" class="link-button" onclick="downloadButtonClick()" jsselect="downloadButton" jscontent="msg" jsvalues=".disabledText:disabledMsg" jstcache="6" style="display: none;">
+            </a>
+          </div>
+          <div id="download-link-clicked-wrapper" class="hidden" jstcache="0">
+            <div id="download-link-clicked" class="link-button" jsselect="downloadButton" jscontent="disabledMsg" jstcache="11" style="display: none;">
+            </div>
+          </div>
+        </div>
+        <div id="save-page-for-later-button" class="hidden" jstcache="0">
+          <a class="link-button" onclick="savePageLaterClick()" jsselect="savePageLater" jscontent="savePageMsg" jstcache="10" style="display: none;">
+          </a>
+        </div>
+        <div id="cancel-save-page-button" class="hidden" onclick="cancelSavePageClick()" jsselect="savePageLater" jsvalues=".innerHTML:cancelMsg" jstcache="4" style="display: none;">
+        </div>
+        <div id="offline-content-list" class="list-hidden" hidden="" jstcache="0">
+          <div id="offline-content-list-visibility-card" onclick="toggleOfflineContentListVisibility(true)" jstcache="0">
+            <div id="offline-content-list-title" jsselect="offlineContentList" jscontent="title" jstcache="12" style="display: none;">
+            </div>
+            <div jstcache="0">
+              <div id="offline-content-list-show-text" jsselect="offlineContentList" jscontent="showText" jstcache="14" style="display: none;">
+              </div>
+              <div id="offline-content-list-hide-text" jsselect="offlineContentList" jscontent="hideText" jstcache="15" style="display: none;">
+              </div>
+            </div>
+          </div>
+          <div id="offline-content-suggestions" jstcache="0"></div>
+          <div id="offline-content-list-action" jstcache="0">
+            <a class="link-button" onclick="launchDownloadsPage()" jsselect="offlineContentList" jscontent="actionText" jstcache="13" style="display: none;">
+            </a>
+          </div>
+        </div>
+      </div>
+    </div>
+    <div id="buttons" class="nav-wrapper suggested-left" jstcache="0">
+      <div id="control-buttons" hidden="" jstcache="0">
+        <button id="reload-button" class="blue-button text-button" onclick="reloadButtonClick(this.url);" jsselect="reloadButton" jsvalues=".url:reloadUrl" jscontent="msg" jstcache="5" style="display: none;"></button>
+        <button id="download-button" class="blue-button text-button" onclick="downloadButtonClick()" jsselect="downloadButton" jscontent="msg" jsvalues=".disabledText:disabledMsg" jstcache="6" style="display: none;">
+        </button>
+      </div>
+      <button id="details-button" class="secondary-button text-button small-link singular" onclick="detailsButtonClick(); toggleHelpBox()" jscontent="details" jsdisplay="(suggestionsDetails &amp;&amp; suggestionsDetails.length &gt; 0) || diagnose" jsvalues=".detailsText:details; .hideDetailsText:hideDetails;" jstcache="2" style="display: none;"></button>
+    </div>
+    <div id="details" class="hidden" jstcache="0">
+      <div class="suggestions" jsselect="suggestionsDetails" jstcache="3" jsinstance="*0" style="display: none;">
+        <div class="suggestion-header" jsvalues=".innerHTML:header" jstcache="7"></div>
+        <div class="suggestion-body" jsvalues=".innerHTML:body" jstcache="8"></div>
+      </div>
+    </div>
+  </div>
+  <div id="sub-frame-error" jstcache="0">
+    <!-- Show details when hovering over the icon, in case the details are
+         hidden because they're too large. -->
+    <div class="icon icon-generic" jstcache="0"></div>
+    <div id="sub-frame-error-details" jsselect="summary" jsvalues=".innerHTML:msg" jstcache="1">This content is blocked. Contact the site owner to fix the issue.</div>
+  </div>
+
+  <div id="offline-resources" jstcache="0">
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+
+
+<script jstcache="0">var loadTimeDataRaw = {"details":"Details","errorCode":"ERR_BLOCKED_BY_CSP","fontfamily":"'Segoe UI', Tahoma, sans-serif","fontfamilyMd":"'Segoe UI', Tahoma, sans-serif","fontsize":"75%","heading":{"hostName":"td.doubleclick.net","msg":"\u003Cspan jscontent=\"hostName\">\u003C/span> is blocked"},"hideDetails":"Hide details","iconClass":"icon-generic","language":"en","suggestionsDetails":[],"suggestionsSummaryList":[],"summary":{"failedUrl":"https://td.doubleclick.net/td/rul/654613002?random=1713704485778&cv=11&fst=1713704485778&fmt=3&bg=ffffff&guid=ON&async=1&gtm=45be44h0v9179586716za200&gcd=13l3l3l3l1&dma=0&u_w=1536&u_h=864&url=https%3A%2F%2Fdashboard.workos.com%2Fenvironment_01HW0B51Y5DVM09Q10FCPJK811%2Fonboarding%2Faudit-logs&hn=www.googleadservices.com&frm=0&tiba=Audit%20logs%20onboarding%20%7C%20WorkOS&npa=0&pscdl=noapi&auid=796908348.1713703616&uaa=x86&uab=64&uafvl=Chromium%3B124.0.6367.60%7CGoogle%2520Chrome%3B124.0.6367.60%7CNot-A.Brand%3B99.0.0.0&uamb=0&uam=&uap=Windows&uapv=15.0.0&uaw=0&fledge=1&data=event%3Dform_submit","hostName":"td.doubleclick.net","msg":"This content is blocked. Contact the site owner to fix the issue."},"textdirection":"ltr","title":"td.doubleclick.net"};</script></body></html>
\ No newline at end of file

From c943c79ffcb5fa68993a625afe9d3dd38bd2dc8f Mon Sep 17 00:00:00 2001
From: Romeo Rosete <110788242+bombastictranz@users.noreply.github.com>
Date: Wed, 24 Apr 2024 07:44:53 -0400
Subject: [PATCH 2/3] 654613002(2).html

Stock control supervisors
---
 654613002(2).html | 6809 +++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 6809 insertions(+)
 create mode 100644 654613002(2).html

diff --git a/654613002(2).html b/654613002(2).html
new file mode 100644
index 0000000000..75679cc400
--- /dev/null
+++ b/654613002(2).html
@@ -0,0 +1,6809 @@
+<!DOCTYPE html>
+<!-- saved from url=(0029)chrome-error://chromewebdata/ -->
+<html dir="ltr" lang="en" subframe=""><head><meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
+  
+  <meta name="color-scheme" content="light dark">
+  <meta name="theme-color" content="#fff">
+  <meta name="viewport" content="width=device-width, initial-scale=1.0,
+                                 maximum-scale=1.0, user-scalable=no">
+  <title>td.doubleclick.net</title>
+  <style>/* Copyright 2017 The Chromium Authors
+ * Use of this source code is governed by a BSD-style license that can be
+ * found in the LICENSE file. */
+
+a {
+  color: var(--link-color);
+}
+
+body {
+  --background-color: #fff;
+  --error-code-color: var(--google-gray-700);
+  --google-blue-100: rgb(210, 227, 252);
+  --google-blue-300: rgb(138, 180, 248);
+  --google-blue-600: rgb(26, 115, 232);
+  --google-blue-700: rgb(25, 103, 210);
+  --google-gray-100: rgb(241, 243, 244);
+  --google-gray-300: rgb(218, 220, 224);
+  --google-gray-500: rgb(154, 160, 166);
+  --google-gray-50: rgb(248, 249, 250);
+  --google-gray-600: rgb(128, 134, 139);
+  --google-gray-700: rgb(95, 99, 104);
+  --google-gray-800: rgb(60, 64, 67);
+  --google-gray-900: rgb(32, 33, 36);
+  --heading-color: var(--google-gray-900);
+  --link-color: rgb(88, 88, 88);
+  --popup-container-background-color: rgba(0,0,0,.65);
+  --primary-button-fill-color-active: var(--google-blue-700);
+  --primary-button-fill-color: var(--google-blue-600);
+  --primary-button-text-color: #fff;
+  --quiet-background-color: rgb(247, 247, 247);
+  --secondary-button-border-color: var(--google-gray-500);
+  --secondary-button-fill-color: #fff;
+  --secondary-button-hover-border-color: var(--google-gray-600);
+  --secondary-button-hover-fill-color: var(--google-gray-50);
+  --secondary-button-text-color: var(--google-gray-700);
+  --small-link-color: var(--google-gray-700);
+  --text-color: var(--google-gray-700);
+  background: var(--background-color);
+  color: var(--text-color);
+  word-wrap: break-word;
+}
+
+.nav-wrapper .secondary-button {
+  background: var(--secondary-button-fill-color);
+  border: 1px solid var(--secondary-button-border-color);
+  color: var(--secondary-button-text-color);
+  float: none;
+  margin: 0;
+  padding: 8px 16px;
+}
+
+.hidden {
+  display: none;
+}
+
+html {
+  -webkit-text-size-adjust: 100%;
+  font-size: 125%;
+}
+
+.icon {
+  background-repeat: no-repeat;
+  background-size: 100%;
+}
+
+@media (prefers-color-scheme: dark) {
+  body {
+    --background-color: var(--google-gray-900);
+    --error-code-color: var(--google-gray-500);
+    --heading-color: var(--google-gray-500);
+    --link-color: var(--google-blue-300);
+    --primary-button-fill-color-active: rgb(129, 162, 208);
+    --primary-button-fill-color: var(--google-blue-300);
+    --primary-button-text-color: var(--google-gray-900);
+    --quiet-background-color: var(--background-color);
+    --secondary-button-border-color: var(--google-gray-700);
+    --secondary-button-fill-color: var(--google-gray-900);
+    --secondary-button-hover-fill-color: rgb(48, 51, 57);
+    --secondary-button-text-color: var(--google-blue-300);
+    --small-link-color: var(--google-blue-300);
+    --text-color: var(--google-gray-500);
+  }
+}
+</style>
+  <style>/* Copyright 2014 The Chromium Authors
+   Use of this source code is governed by a BSD-style license that can be
+   found in the LICENSE file. */
+
+button {
+  border: 0;
+  border-radius: 20px;
+  box-sizing: border-box;
+  color: var(--primary-button-text-color);
+  cursor: pointer;
+  float: right;
+  font-size: .875em;
+  margin: 0;
+  padding: 8px 16px;
+  transition: box-shadow 150ms cubic-bezier(0.4, 0, 0.2, 1);
+  user-select: none;
+}
+
+[dir='rtl'] button {
+  float: left;
+}
+
+.bad-clock button,
+.captive-portal button,
+.https-only button,
+.insecure-form button,
+.lookalike-url button,
+.main-frame-blocked button,
+.neterror button,
+.pdf button,
+.ssl button,
+.enterprise-block button,
+.enterprise-warn button,
+.safe-browsing-billing button {
+  background: var(--primary-button-fill-color);
+}
+
+button:active {
+  background: var(--primary-button-fill-color-active);
+  outline: 0;
+}
+
+#debugging {
+  display: inline;
+  overflow: auto;
+}
+
+.debugging-content {
+  line-height: 1em;
+  margin-bottom: 0;
+  margin-top: 1em;
+}
+
+.debugging-content-fixed-width {
+  display: block;
+  font-family: monospace;
+  font-size: 1.2em;
+  margin-top: 0.5em;
+}
+
+.debugging-title {
+  font-weight: bold;
+}
+
+#details {
+  margin: 0 0 50px;
+}
+
+#details p:not(:first-of-type) {
+  margin-top: 20px;
+}
+
+.secondary-button:active {
+  border-color: white;
+  box-shadow: 0 1px 2px 0 rgba(60, 64, 67, .3),
+      0 2px 6px 2px rgba(60, 64, 67, .15);
+}
+
+.secondary-button:hover {
+  background: var(--secondary-button-hover-fill-color);
+  border-color: var(--secondary-button-hover-border-color);
+  text-decoration: none;
+}
+
+.error-code {
+  color: var(--error-code-color);
+  font-size: .8em;
+  margin-top: 12px;
+  text-transform: uppercase;
+}
+
+#error-debugging-info {
+  font-size: 0.8em;
+}
+
+h1 {
+  color: var(--heading-color);
+  font-size: 1.6em;
+  font-weight: normal;
+  line-height: 1.25em;
+  margin-bottom: 16px;
+}
+
+h2 {
+  font-size: 1.2em;
+  font-weight: normal;
+}
+
+.icon {
+  height: 72px;
+  margin: 0 0 40px;
+  width: 72px;
+}
+
+input[type=checkbox] {
+  opacity: 0;
+}
+
+input[type=checkbox]:focus ~ .checkbox::after {
+  outline: -webkit-focus-ring-color auto 5px;
+}
+
+.interstitial-wrapper {
+  box-sizing: border-box;
+  font-size: 1em;
+  line-height: 1.6em;
+  margin: 14vh auto 0;
+  max-width: 600px;
+  width: 100%;
+}
+
+#main-message > p {
+  display: inline;
+}
+
+#extended-reporting-opt-in {
+  font-size: .875em;
+  margin-top: 32px;
+}
+
+#extended-reporting-opt-in label {
+  display: grid;
+  grid-template-columns: 1.8em 1fr;
+  position: relative;
+}
+
+#enhanced-protection-message {
+  border-radius: 20px;
+  font-size: 1em;
+  margin-top: 32px;
+  padding: 10px 5px;
+}
+
+#enhanced-protection-message a {
+  color: var(--google-red-10);
+}
+
+#enhanced-protection-message label {
+  display: grid;
+  grid-template-columns: 2.5em 1fr;
+  position: relative;
+}
+
+#enhanced-protection-message div {
+  margin: 0.5em;
+}
+
+#enhanced-protection-message .icon {
+  height: 1.5em;
+  vertical-align: middle;
+  width: 1.5em;
+}
+
+.nav-wrapper {
+  margin-top: 51px;
+}
+
+.nav-wrapper::after {
+  clear: both;
+  content: '';
+  display: table;
+  width: 100%;
+}
+
+.small-link {
+  color: var(--small-link-color);
+  font-size: .875em;
+}
+
+.checkboxes {
+  flex: 0 0 24px;
+}
+
+.checkbox {
+  --padding: .9em;
+  background: transparent;
+  display: block;
+  height: 1em;
+  left: -1em;
+  padding-inline-start: var(--padding);
+  position: absolute;
+  right: 0;
+  top: -.5em;
+  width: 1em;
+}
+
+.checkbox::after {
+  border: 1px solid white;
+  border-radius: 2px;
+  content: '';
+  height: 1em;
+  left: var(--padding);
+  position: absolute;
+  top: var(--padding);
+  width: 1em;
+}
+
+.checkbox::before {
+  background: transparent;
+  border: 2px solid white;
+  border-inline-end-width: 0;
+  border-top-width: 0;
+  content: '';
+  height: .2em;
+  left: calc(.3em + var(--padding));
+  opacity: 0;
+  position: absolute;
+  top: calc(.3em  + var(--padding));
+  transform: rotate(-45deg);
+  width: .5em;
+}
+
+input[type=checkbox]:checked ~ .checkbox::before {
+  opacity: 1;
+}
+
+#recurrent-error-message {
+  background: #ededed;
+  border-radius: 4px;
+  margin-bottom: 16px;
+  margin-top: 12px;
+  padding: 12px 16px;
+}
+
+.showing-recurrent-error-message #extended-reporting-opt-in {
+  margin-top: 16px;
+}
+
+.showing-recurrent-error-message #enhanced-protection-message {
+  margin-top: 16px;
+}
+
+@media (max-width: 700px) {
+  .interstitial-wrapper {
+    padding: 0 10%;
+  }
+
+  #error-debugging-info {
+    overflow: auto;
+  }
+}
+
+@media (max-width: 420px) {
+  button,
+  [dir='rtl'] button,
+  .small-link {
+    float: none;
+    font-size: .825em;
+    font-weight: 500;
+    margin: 0;
+    width: 100%;
+  }
+
+  button {
+    padding: 16px 24px;
+  }
+
+  #details {
+    margin: 20px 0 20px 0;
+  }
+
+  #details p:not(:first-of-type) {
+    margin-top: 10px;
+  }
+
+  .secondary-button:not(.hidden) {
+    display: block;
+    margin-top: 20px;
+    text-align: center;
+    width: 100%;
+  }
+
+  .interstitial-wrapper {
+    padding: 0 5%;
+  }
+
+  #extended-reporting-opt-in {
+    margin-top: 24px;
+  }
+
+  #enhanced-protection-message {
+    margin-top: 24px;
+  }
+
+  .nav-wrapper {
+    margin-top: 30px;
+  }
+}
+
+/**
+ * Mobile specific styling.
+ * Navigation buttons are anchored to the bottom of the screen.
+ * Details message replaces the top content in its own scrollable area.
+ */
+
+@media (max-width: 420px) {
+  .nav-wrapper .secondary-button {
+    border: 0;
+    margin: 16px 0 0;
+    margin-inline-end: 0;
+    padding-bottom: 16px;
+    padding-top: 16px;
+  }
+}
+
+/* Fixed nav. */
+@media (min-width: 240px) and (max-width: 420px) and
+       (min-height: 401px),
+       (min-width: 421px) and (min-height: 240px) and
+       (max-height: 560px) {
+  body .nav-wrapper {
+    background: var(--background-color);
+    bottom: 0;
+    box-shadow: 0 -12px 24px var(--background-color);
+    left: 0;
+    margin: 0 auto;
+    max-width: 736px;
+    padding-inline-end: 24px;
+    padding-inline-start: 24px;
+    position: fixed;
+    right: 0;
+    width: 100%;
+    z-index: 2;
+  }
+
+  .interstitial-wrapper {
+    max-width: 736px;
+  }
+
+  #details,
+  #main-content {
+    padding-bottom: 40px;
+  }
+
+  #details {
+    padding-top: 5.5vh;
+  }
+
+  button.small-link {
+    color: var(--google-blue-600);
+  }
+}
+
+@media (max-width: 420px) and (orientation: portrait),
+       (max-height: 560px) {
+  body {
+    margin: 0 auto;
+  }
+
+  button,
+  [dir='rtl'] button,
+  button.small-link,
+  .nav-wrapper .secondary-button {
+    font-family: Roboto-Regular,Helvetica;
+    font-size: .933em;
+    margin: 6px 0;
+    transform: translatez(0);
+  }
+
+  .nav-wrapper {
+    box-sizing: border-box;
+    padding-bottom: 8px;
+    width: 100%;
+  }
+
+  #details {
+    box-sizing: border-box;
+    height: auto;
+    margin: 0;
+    opacity: 1;
+    transition: opacity 250ms cubic-bezier(0.4, 0, 0.2, 1);
+  }
+
+  #details.hidden,
+  #main-content.hidden {
+    height: 0;
+    opacity: 0;
+    overflow: hidden;
+    padding-bottom: 0;
+    transition: none;
+  }
+
+  h1 {
+    font-size: 1.5em;
+    margin-bottom: 8px;
+  }
+
+  .icon {
+    margin-bottom: 5.69vh;
+  }
+
+  .interstitial-wrapper {
+    box-sizing: border-box;
+    margin: 7vh auto 12px;
+    padding: 0 24px;
+    position: relative;
+  }
+
+  .interstitial-wrapper p {
+    font-size: .95em;
+    line-height: 1.61em;
+    margin-top: 8px;
+  }
+
+  #main-content {
+    margin: 0;
+    transition: opacity 100ms cubic-bezier(0.4, 0, 0.2, 1);
+  }
+
+  .small-link {
+    border: 0;
+  }
+
+  .suggested-left > #control-buttons,
+  .suggested-right > #control-buttons {
+    float: none;
+    margin: 0;
+  }
+}
+
+@media (min-width: 421px) and (min-height: 500px) and (max-height: 560px) {
+  .interstitial-wrapper {
+    margin-top: 10vh;
+  }
+}
+
+@media (min-height: 400px) and (orientation:portrait) {
+  .interstitial-wrapper {
+    margin-bottom: 145px;
+  }
+}
+
+@media (min-height: 299px) {
+  .nav-wrapper {
+    padding-bottom: 16px;
+  }
+}
+
+@media (max-height: 560px) and (min-height: 240px) and (orientation:landscape) {
+  .extended-reporting-has-checkbox #details {
+    padding-bottom: 80px;
+  }
+}
+
+@media (min-height: 500px) and (max-height: 650px) and (max-width: 414px) and
+       (orientation: portrait) {
+  .interstitial-wrapper {
+    margin-top: 7vh;
+  }
+}
+
+@media (min-height: 650px) and (max-width: 414px) and (orientation: portrait) {
+  .interstitial-wrapper {
+    margin-top: 10vh;
+  }
+}
+
+/* Small mobile screens. No fixed nav. */
+@media (max-height: 400px) and (orientation: portrait),
+       (max-height: 239px) and (orientation: landscape),
+       (max-width: 419px) and (max-height: 399px) {
+  .interstitial-wrapper {
+    display: flex;
+    flex-direction: column;
+    margin-bottom: 0;
+  }
+
+  #details {
+    flex: 1 1 auto;
+    order: 0;
+  }
+
+  #main-content {
+    flex: 1 1 auto;
+    order: 0;
+  }
+
+  .nav-wrapper {
+    flex: 0 1 auto;
+    margin-top: 8px;
+    order: 1;
+    padding-inline-end: 0;
+    padding-inline-start: 0;
+    position: relative;
+    width: 100%;
+  }
+
+  button,
+  .nav-wrapper .secondary-button {
+    padding: 16px 24px;
+  }
+
+  button.small-link {
+    color: var(--google-blue-600);
+  }
+}
+
+@media (max-width: 239px) and (orientation: portrait) {
+  .nav-wrapper {
+    padding-inline-end: 0;
+    padding-inline-start: 0;
+  }
+}
+</style>
+  <style>/* Copyright 2013 The Chromium Authors
+ * Use of this source code is governed by a BSD-style license that can be
+ * found in the LICENSE file. */
+
+/* Don't use the main frame div when the error is in a subframe. */
+html[subframe] #main-frame-error {
+  display: none;
+}
+
+/* Don't use the subframe error div when the error is in a main frame. */
+html:not([subframe]) #sub-frame-error {
+  display: none;
+}
+
+h1 {
+  margin-top: 0;
+  word-wrap: break-word;
+}
+
+h1 span {
+  font-weight: 500;
+}
+
+a {
+  text-decoration: none;
+}
+
+.icon {
+  -webkit-user-select: none;
+  display: inline-block;
+}
+
+.icon-generic {
+  /* Can't access chrome://theme/IDR_ERROR_NETWORK_GENERIC from an untrusted
+   * renderer process, so embed the resource manually. */
+  content: image-set(
+      url(data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAEgAAABIAQMAAABvIyEEAAAABlBMVEUAAABTU1OoaSf/AAAAAXRSTlMAQObYZgAAAENJREFUeF7tzbEJACEQRNGBLeAasBCza2lLEGx0CxFGG9hBMDDxRy/72O9FMnIFapGylsu1fgoBdkXfUHLrQgdfrlJN1BdYBjQQm3UAAAAASUVORK5CYII=) 1x,
+      url(data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAJAAAACQAQMAAADdiHD7AAAABlBMVEUAAABTU1OoaSf/AAAAAXRSTlMAQObYZgAAAFJJREFUeF7t0cENgDAMQ9FwYgxG6WjpaIzCCAxQxVggFuDiCvlLOeRdHR9yzjncHVoq3npu+wQUrUuJHylSTmBaespJyJQoObUeyxDQb3bEm5Au81c0pSCD8HYAAAAASUVORK5CYII=) 2x);
+}
+
+.icon-info {
+  content: image-set(
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+
+#suggestions-list a {
+  color: var(--google-blue-600);
+}
+
+#suggestions-list p {
+  margin-block-end: 0;
+}
+
+#suggestions-list ul {
+  margin-top: 0;
+}
+
+.single-suggestion {
+  list-style-type: none;
+  padding-inline-start: 0;
+}
+
+#error-information-button {
+  content: url(data:image/svg+xml;base64,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);
+  height: 24px;
+  vertical-align: -.15em;
+  width: 24px;
+}
+
+.use-popup-container#error-information-popup-container
+  #error-information-popup {
+  align-items: center;
+  background-color: var(--popup-container-background-color);
+  display: flex;
+  height: 100%;
+  left: 0;
+  position: fixed;
+  top: 0;
+  width: 100%;
+  z-index: 100;
+}
+
+.use-popup-container#error-information-popup-container
+  #error-information-popup-content > p {
+  margin-bottom: 11px;
+  margin-inline-start: 20px;
+}
+
+.use-popup-container#error-information-popup-container #suggestions-list ul {
+  margin-inline-start: 15px;
+}
+
+.use-popup-container#error-information-popup-container
+  #error-information-popup-box {
+  background-color: var(--background-color);
+  left: 5%;
+  padding-bottom: 15px;
+  padding-top: 15px;
+  position: fixed;
+  width: 90%;
+  z-index: 101;
+}
+
+.use-popup-container#error-information-popup-container div.error-code {
+  margin-inline-start: 20px;
+}
+
+.use-popup-container#error-information-popup-container #suggestions-list p {
+  margin-inline-start: 20px;
+}
+
+:not(.use-popup-container)#error-information-popup-container
+  #error-information-popup-close {
+  display: none;
+}
+
+#error-information-popup-close {
+  margin-bottom: 0;
+  margin-inline-end: 35px;
+  margin-top: 15px;
+  text-align: end;
+}
+
+.link-button {
+  color: rgb(66, 133, 244);
+  display: inline-block;
+  font-weight: bold;
+  text-transform: uppercase;
+}
+
+#sub-frame-error-details {
+
+  color: #8F8F8F;
+
+  /* Not done on mobile for performance reasons. */
+  text-shadow: 0 1px 0 rgba(255,255,255,0.3);
+
+}
+
+[jscontent=hostName],
+[jscontent=failedUrl] {
+  overflow-wrap: break-word;
+}
+
+.secondary-button {
+  background: #d9d9d9;
+  color: #696969;
+  margin-inline-end: 16px;
+}
+
+.snackbar {
+  background: #323232;
+  border-radius: 2px;
+  bottom: 24px;
+  box-sizing: border-box;
+  color: #fff;
+  font-size: .87em;
+  left: 24px;
+  max-width: 568px;
+  min-width: 288px;
+  opacity: 0;
+  padding: 16px 24px 12px;
+  position: fixed;
+  transform: translateY(90px);
+  will-change: opacity, transform;
+  z-index: 999;
+}
+
+.snackbar-show {
+  -webkit-animation:
+    show-snackbar 250ms cubic-bezier(0, 0, 0.2, 1) forwards,
+    hide-snackbar 250ms cubic-bezier(0.4, 0, 1, 1) forwards 5s;
+}
+
+@-webkit-keyframes show-snackbar {
+  100% {
+    opacity: 1;
+    transform: translateY(0);
+  }
+}
+
+@-webkit-keyframes hide-snackbar {
+  0% {
+    opacity: 1;
+    transform: translateY(0);
+  }
+  100% {
+    opacity: 0;
+    transform: translateY(90px);
+  }
+}
+
+.suggestions {
+  margin-top: 18px;
+}
+
+.suggestion-header {
+  font-weight: bold;
+  margin-bottom: 4px;
+}
+
+.suggestion-body {
+  color: #777;
+}
+
+/* Decrease padding at low sizes. */
+@media (max-width: 640px), (max-height: 640px) {
+  h1 {
+    margin: 0 0 15px;
+  }
+  .suggestions {
+    margin-top: 10px;
+  }
+  .suggestion-header {
+    margin-bottom: 0;
+  }
+}
+
+#download-link,
+#download-link-clicked {
+  margin-bottom: 30px;
+  margin-top: 30px;
+}
+
+#download-link-clicked {
+  color: #BBB;
+}
+
+#download-link::before,
+#download-link-clicked::before {
+  content: url(data:image/svg+xml;base64,PHN2ZyB4bWxucz0iaHR0cDovL3d3dy53My5vcmcvMjAwMC9zdmciIHdpZHRoPSIxLjJlbSIgaGVpZ2h0PSIxLjJlbSIgdmlld0JveD0iMCAwIDI0IDI0Ij48cGF0aCBkPSJNNSAyMGgxNHYtMkg1bTE0LTloLTRWM0g5djZINWw3IDcgNy03eiIgZmlsbD0iIzQyODVGNCIvPjwvc3ZnPg==);
+  display: inline-block;
+  margin-inline-end: 4px;
+  vertical-align: -webkit-baseline-middle;
+}
+
+#download-link-clicked::before {
+  opacity: 0;
+  width: 0;
+}
+
+#offline-content-list-visibility-card {
+  border: 1px solid white;
+  border-radius: 8px;
+  display: flex;
+  font-size: .8em;
+  justify-content: space-between;
+  line-height: 1;
+}
+
+#offline-content-list.list-hidden #offline-content-list-visibility-card {
+  border-color: rgb(218, 220, 224);
+}
+
+#offline-content-list-visibility-card > div {
+  padding: 1em;
+}
+
+#offline-content-list-title {
+  color: var(--google-gray-700);
+}
+
+#offline-content-list-show-text,
+#offline-content-list-hide-text {
+  color: rgb(66, 133, 244);
+}
+
+/* Hides the "hide" text div when the offline content list is collapsed/hidden
+ * and, alternatively, hides the "show" text div when the offline content list
+ * is expanded/shown.
+ */
+#offline-content-list.list-hidden #offline-content-list-hide-text,
+#offline-content-list:not(.list-hidden) #offline-content-list-show-text {
+  display: none;
+}
+
+/* Controls the animation of the offline content list when it is expanded/shown.
+ */
+#offline-content-suggestions {
+  /* Max-height has to be set for the height animation to work. The chosen value
+   * is a little greater than the maximum height the list will have, when all
+   * suggestions have images, so that it is never clamped. This makes so that
+   * when the actual height is smaller then the animation is not as smooth.
+   */
+  max-height: 27em;
+  transition: max-height 200ms ease-in, visibility 0s 200ms,
+              opacity 200ms 200ms linear;
+}
+
+/* Controls the animation of the offline content list when it is
+ * collapsed/hidden.
+ */
+#offline-content-list.list-hidden #offline-content-suggestions {
+  max-height: 0;
+  opacity: 0;
+  transition: opacity 200ms linear, visibility 0s 200ms,
+              max-height 200ms 200ms ease-out;
+  visibility: hidden;
+}
+
+#offline-content-list {
+  margin-inline-start: -5%;
+  width: 110%;
+}
+
+/* The selectors below adjust the "overflow" of the suggestion cards contents
+ * based on the same screen size based strategy used for the main frame, which
+ * is applied by the `interstitial-wrapper` class. */
+@media (max-width: 420px)  {
+  #offline-content-list {
+    margin-inline-start: -2.5%;
+    width: 105%;
+  }
+}
+@media (max-width: 420px) and (orientation: portrait),
+       (max-height: 560px) {
+  #offline-content-list {
+    margin-inline-start: -12px;
+    width: calc(100% + 24px);
+  }
+}
+
+.suggestion-with-image .offline-content-suggestion-thumbnail {
+  flex-basis: 8.2em;
+  flex-shrink: 0;
+}
+
+.suggestion-with-image .offline-content-suggestion-thumbnail > img {
+  height: 100%;
+  width: 100%;
+}
+
+.suggestion-with-image #offline-content-list:not(.is-rtl)
+.offline-content-suggestion-thumbnail > img {
+  border-bottom-right-radius: 7px;
+  border-top-right-radius: 7px;
+}
+
+.suggestion-with-image #offline-content-list.is-rtl
+.offline-content-suggestion-thumbnail > img {
+  border-bottom-left-radius: 7px;
+  border-top-left-radius: 7px;
+}
+
+.suggestion-with-icon .offline-content-suggestion-thumbnail {
+  align-items: center;
+  display: flex;
+  justify-content: center;
+  min-height: 4.2em;
+  min-width: 4.2em;
+}
+
+.suggestion-with-icon .offline-content-suggestion-thumbnail > div {
+  align-items: center;
+  background-color: rgb(241, 243, 244);
+  border-radius: 50%;
+  display: flex;
+  height: 2.3em;
+  justify-content: center;
+  width: 2.3em;
+}
+
+.suggestion-with-icon .offline-content-suggestion-thumbnail > div > img {
+  height: 1.45em;
+  width: 1.45em;
+}
+
+.offline-content-suggestion-favicon {
+  height: 1em;
+  margin-inline-end: 0.4em;
+  width: 1.4em;
+}
+
+.offline-content-suggestion-favicon > img {
+  height: 1.4em;
+  width: 1.4em;
+}
+
+.no-favicon .offline-content-suggestion-favicon {
+  display: none;
+}
+
+.image-video {
+  content: url(data:image/svg+xml;base64,PHN2ZyB4bWxucz0iaHR0cDovL3d3dy53My5vcmcvMjAwMC9zdmciIHdpZHRoPSIyNCIgaGVpZ2h0PSIyNCIgdmlld0JveD0iMCAwIDI0IDI0Ij48cGF0aCBkPSJNMTcgMTAuNVY3YTEgMSAwIDAgMC0xLTFINGExIDEgMCAwIDAtMSAxdjEwYTEgMSAwIDAgMCAxIDFoMTJhMSAxIDAgMCAwIDEtMXYtMy41bDQgNHYtMTFsLTQgNHoiIGZpbGw9IiMzQzQwNDMiLz48L3N2Zz4=);
+}
+
+.image-music-note {
+  content: url(data:image/svg+xml;base64,PHN2ZyB4bWxucz0iaHR0cDovL3d3dy53My5vcmcvMjAwMC9zdmciIHdpZHRoPSIyNCIgaGVpZ2h0PSIyNCIgdmlld0JveD0iMCAwIDI0IDI0Ij48cGF0aCBkPSJNMTIgM3Y5LjI2Yy0uNS0uMTctMS0uMjYtMS41LS4yNkM4IDEyIDYgMTQgNiAxNi41UzggMjEgMTAuNSAyMXM0LjUtMiA0LjUtNC41VjZoNFYzaC03eiIgZmlsbD0iIzNDNDA0MyIvPjwvc3ZnPg==);
+}
+
+.image-earth {
+  content: url(data:image/svg+xml;base64,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);
+}
+
+.image-file {
+  content: url(data:image/svg+xml;base64,PHN2ZyB4bWxucz0iaHR0cDovL3d3dy53My5vcmcvMjAwMC9zdmciIHdpZHRoPSIyNCIgaGVpZ2h0PSIyNCIgdmlld0JveD0iMCAwIDI0IDI0Ij48cGF0aCBkPSJNMTMgOVYzLjVMMTguNSA5TTYgMmMtMS4xMSAwLTIgLjg5LTIgMnYxNmEyIDIgMCAwIDAgMiAyaDEyYTIgMiAwIDAgMCAyLTJWOGwtNi02SDZ6IiBmaWxsPSIjM0M0MDQzIi8+PC9zdmc+);
+}
+
+.offline-content-suggestion-texts {
+  display: flex;
+  flex-direction: column;
+  justify-content: space-between;
+  line-height: 1.3;
+  padding: .9em;
+  width: 100%;
+}
+
+.offline-content-suggestion-title {
+  -webkit-box-orient: vertical;
+  -webkit-line-clamp: 3;
+  color: rgb(32, 33, 36);
+  display: -webkit-box;
+  font-size: 1.1em;
+  overflow: hidden;
+  text-overflow: ellipsis;
+}
+
+div.offline-content-suggestion {
+  align-items: stretch;
+  border: 1px solid rgb(218, 220, 224);
+  border-radius: 8px;
+  display: flex;
+  justify-content: space-between;
+  margin-bottom: .8em;
+}
+
+.suggestion-with-image {
+  flex-direction: row;
+  height: 8.2em;
+  max-height: 8.2em;
+}
+
+.suggestion-with-icon {
+  flex-direction: row-reverse;
+  height: 4.2em;
+  max-height: 4.2em;
+}
+
+.suggestion-with-icon .offline-content-suggestion-title {
+  -webkit-line-clamp: 1;
+  word-break: break-all;
+}
+
+.suggestion-with-icon .offline-content-suggestion-texts {
+  padding-inline-start: 0;
+}
+
+.offline-content-suggestion-attribution-freshness {
+  color: rgb(95, 99, 104);
+  display: flex;
+  font-size: .8em;
+  line-height: 1.7em;
+}
+
+.offline-content-suggestion-attribution {
+  -webkit-box-orient: vertical;
+  -webkit-line-clamp: 1;
+  display: -webkit-box;
+  flex-shrink: 1;
+  margin-inline-end: 0.3em;
+  overflow: hidden;
+  overflow-wrap: break-word;
+  text-overflow: ellipsis;
+  word-break: break-all;
+}
+
+.no-attribution .offline-content-suggestion-attribution {
+  display: none;
+}
+
+.offline-content-suggestion-freshness::before {
+  content: '-';
+  display: inline-block;
+  flex-shrink: 0;
+  margin-inline-end: .1em;
+  margin-inline-start: .1em;
+}
+
+.no-attribution .offline-content-suggestion-freshness::before {
+  display: none;
+}
+
+.offline-content-suggestion-freshness {
+  flex-shrink: 0;
+}
+
+.suggestion-with-image .offline-content-suggestion-pin-spacer {
+  flex-grow: 100;
+  flex-shrink: 1;
+}
+
+.suggestion-with-image .offline-content-suggestion-pin {
+  content: url(data:image/svg+xml;base64,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);
+  flex-shrink: 0;
+  height: 1.4em;
+  margin-inline-start: .4em;
+  width: 1.4em;
+}
+
+/* Controls the animation (and a bit more) of the launch-downloads-home action
+ * button when the offline content list is expanded/shown.
+ */
+#offline-content-list-action {
+  text-align: center;
+  transition: visibility 0s 200ms, opacity 200ms 200ms linear;
+}
+
+/* Controls the animation of the launch-downloads-home action button when the
+ * offline content list is collapsed/hidden.
+ */
+#offline-content-list.list-hidden #offline-content-list-action {
+  opacity: 0;
+  transition: opacity 200ms linear, visibility 0s 200ms;
+  visibility: hidden;
+}
+
+#cancel-save-page-button {
+  background-image: url(data:image/svg+xml;base64,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);
+  background-position: right 27px center;
+  background-repeat: no-repeat;
+  border: 1px solid var(--google-gray-300);
+  border-radius: 5px;
+  color: var(--google-gray-700);
+  margin-bottom: 26px;
+  padding-bottom: 16px;
+  padding-inline-end: 88px;
+  padding-inline-start: 16px;
+  padding-top: 16px;
+  text-align: start;
+}
+
+html[dir='rtl'] #cancel-save-page-button {
+  background-position: left 27px center;
+}
+
+#save-page-for-later-button {
+  display: flex;
+  justify-content: start;
+}
+
+#save-page-for-later-button a::before {
+  content: url(data:image/svg+xml;base64,PHN2ZyB4bWxucz0iaHR0cDovL3d3dy53My5vcmcvMjAwMC9zdmciIHdpZHRoPSIxLjJlbSIgaGVpZ2h0PSIxLjJlbSIgdmlld0JveD0iMCAwIDI0IDI0Ij48cGF0aCBkPSJNNSAyMGgxNHYtMkg1bTE0LTloLTRWM0g5djZINWw3IDcgNy03eiIgZmlsbD0iIzQyODVGNCIvPjwvc3ZnPg==);
+  display: inline-block;
+  margin-inline-end: 4px;
+  vertical-align: -webkit-baseline-middle;
+}
+
+.hidden#save-page-for-later-button {
+  display: none;
+}
+
+/* Don't allow overflow when in a subframe. */
+html[subframe] body {
+  overflow: hidden;
+}
+
+#sub-frame-error {
+  -webkit-align-items: center;
+  -webkit-flex-flow: column;
+  -webkit-justify-content: center;
+  background-color: #DDD;
+  display: -webkit-flex;
+  height: 100%;
+  left: 0;
+  position: absolute;
+  text-align: center;
+  top: 0;
+  transition: background-color 200ms ease-in-out;
+  width: 100%;
+}
+
+#sub-frame-error:hover {
+  background-color: #EEE;
+}
+
+#sub-frame-error .icon-generic {
+  margin: 0 0 16px;
+}
+
+#sub-frame-error-details {
+  margin: 0 10px;
+  text-align: center;
+  visibility: hidden;
+}
+
+/* Show details only when hovering. */
+#sub-frame-error:hover #sub-frame-error-details {
+  visibility: visible;
+}
+
+/* If the iframe is too small, always hide the error code. */
+/* TODO(mmenke): See if overflow: no-display works better, once supported. */
+@media (max-width: 200px), (max-height: 95px) {
+  #sub-frame-error-details {
+    display: none;
+  }
+}
+
+/* Adjust icon for small embedded frames in apps. */
+@media (max-height: 100px) {
+  #sub-frame-error .icon-generic {
+    height: auto;
+    margin: 0;
+    padding-top: 0;
+    width: 25px;
+  }
+}
+
+/* details-button is special; it's a <button> element that looks like a link. */
+#details-button {
+  box-shadow: none;
+  min-width: 0;
+}
+
+/* Styles for platform dependent separation of controls and details button. */
+.suggested-left > #control-buttons,
+.suggested-right > #details-button {
+  float: left;
+}
+
+.suggested-right > #control-buttons,
+.suggested-left > #details-button {
+  float: right;
+}
+
+.suggested-left .secondary-button {
+  margin-inline-end: 0;
+  margin-inline-start: 16px;
+}
+
+#details-button.singular {
+  float: none;
+}
+
+/* download-button shows both icon and text. */
+#download-button {
+  padding-bottom: 4px;
+  padding-top: 4px;
+  position: relative;
+}
+
+#download-button::before {
+  background: image-set(
+      url(data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAABgAAAAYCAQAAABKfvVzAAAAO0lEQVQ4y2NgGArgPxIY1YChsOE/LtBAmpYG0mxpIOSDBpKUo2lpIDZxNJCkHKqlYZAla3RAHQ1DFgAARRroHyLNTwwAAAAASUVORK5CYII=) 1x,
+      url(data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAADAAAAAwCAQAAAD9CzEMAAAAZElEQVRYw+3Ruw3AMAwDUY3OzZUmRRD4E9iim9wNwAdbEURHyk4AAAAATiCVK8lLyPsKeT9K3lsownnunfkPxO78hKiYHxBV8x2icr5BVM+/CMf8g3DN34Rzns6ViwHUAUQ/6wIAd5Km7l6c8AAAAABJRU5ErkJggg==) 2x)
+    no-repeat;
+  content: '';
+  display: inline-block;
+  height: 24px;
+  margin-inline-end: 4px;
+  margin-inline-start: -4px;
+  vertical-align: middle;
+  width: 24px;
+}
+
+#download-button:disabled {
+  background: rgb(180, 206, 249);
+  color: rgb(255, 255, 255);
+}
+
+#buttons::after {
+  clear: both;
+  content: '';
+  display: block;
+  width: 100%;
+}
+
+/* Offline page */
+html[dir='rtl'] .runner-container,
+html[dir='rtl'].offline .icon-offline {
+  transform: scaleX(-1);
+}
+
+.offline {
+  transition: filter 1.5s cubic-bezier(0.65, 0.05, 0.36, 1),
+              background-color 1.5s cubic-bezier(0.65, 0.05, 0.36, 1);
+
+  will-change: filter, background-color;
+
+}
+
+.offline body {
+  transition: background-color 1.5s cubic-bezier(0.65, 0.05, 0.36, 1);
+}
+
+.offline #main-message > p {
+  display: none;
+}
+
+.offline.inverted {
+  background-color: #fff;
+  filter: invert(1);
+}
+
+.offline.inverted body {
+  background-color: #fff;
+}
+
+.offline .interstitial-wrapper {
+  color: var(--text-color);
+  font-size: 1em;
+  line-height: 1.55;
+  margin: 0 auto;
+  max-width: 600px;
+  padding-top: 100px;
+  position: relative;
+  width: 100%;
+}
+
+.offline .runner-container {
+  direction: ltr;
+  height: 150px;
+  max-width: 600px;
+  overflow: hidden;
+  position: absolute;
+  top: 35px;
+  width: 44px;
+}
+
+.offline .runner-container:focus {
+  outline: none;
+}
+
+.offline .runner-container:focus-visible {
+  outline: 3px solid var(--google-blue-300);
+}
+
+.offline .runner-canvas {
+  height: 150px;
+  max-width: 600px;
+  opacity: 1;
+  overflow: hidden;
+  position: absolute;
+  top: 0;
+  z-index: 10;
+}
+
+.offline .controller {
+  height: 100vh;
+  left: 0;
+  position: absolute;
+  top: 0;
+  width: 100vw;
+  z-index: 9;
+}
+
+#offline-resources {
+  display: none;
+}
+
+#offline-instruction {
+  image-rendering: pixelated;
+  left: 0;
+  margin: auto;
+  position: absolute;
+  right: 0;
+  top: 60px;
+  width: fit-content;
+}
+
+.offline-runner-live-region {
+  bottom: 0;
+  clip-path: polygon(0 0, 0 0, 0 0);
+  color: var(--background-color);
+  display: block;
+  font-size: xx-small;
+  overflow: hidden;
+  position: absolute;
+  text-align: center;
+  transition: color 1.5s cubic-bezier(0.65, 0.05, 0.36, 1);
+  user-select: none;
+}
+
+/* Custom toggle */
+.slow-speed-option {
+  align-items: center;
+  background: var(--google-gray-50);
+  border-radius: 24px/50%;
+  bottom: 0;
+  color: var(--error-code-color);
+  display: inline-flex;
+  font-size: 1em;
+  left: 0;
+  line-height: 1.1em;
+  margin: 5px auto;
+  padding: 2px 12px 3px 20px;
+  position: absolute;
+  right: 0;
+  width: max-content;
+  z-index: 999;
+}
+
+.slow-speed-option.hidden {
+  display: none;
+}
+
+.slow-speed-option [type=checkbox] {
+  opacity: 0;
+  pointer-events: none;
+  position: absolute;
+}
+
+.slow-speed-option .slow-speed-toggle {
+  cursor: pointer;
+  margin-inline-start: 8px;
+  padding: 8px 4px;
+  position: relative;
+}
+
+.slow-speed-option [type=checkbox]:disabled ~ .slow-speed-toggle {
+  cursor: default;
+}
+
+.slow-speed-option-label [type=checkbox] {
+  opacity: 0;
+  pointer-events: none;
+  position: absolute;
+}
+
+.slow-speed-option .slow-speed-toggle::before,
+.slow-speed-option .slow-speed-toggle::after {
+  content: '';
+  display: block;
+  margin: 0 3px;
+  transition: all 100ms cubic-bezier(0.4, 0, 1, 1);
+}
+
+.slow-speed-option .slow-speed-toggle::before {
+  background: rgb(189,193,198);
+  border-radius: 0.65em;
+  height: 0.9em;
+  width: 2em;
+}
+
+.slow-speed-option .slow-speed-toggle::after {
+  background: #fff;
+  border-radius: 50%;
+  box-shadow: 0 1px 3px 0 rgb(0 0 0 / 40%);
+  height: 1.2em;
+  position: absolute;
+  top: 51%;
+  transform: translate(-20%, -50%);
+  width: 1.1em;
+}
+
+.slow-speed-option [type=checkbox]:focus + .slow-speed-toggle {
+  box-shadow: 0 0 8px rgb(94, 158, 214);
+  outline: 1px solid rgb(93, 157, 213);
+}
+
+.slow-speed-option [type=checkbox]:checked + .slow-speed-toggle::before {
+  background: var(--google-blue-600);
+  opacity: 0.5;
+}
+
+.slow-speed-option [type=checkbox]:checked + .slow-speed-toggle::after {
+  background: var(--google-blue-600);
+  transform: translate(calc(2em - 90%), -50%);
+}
+
+.slow-speed-option [type=checkbox]:checked:disabled +
+  .slow-speed-toggle::before {
+  background: rgb(189,193,198);
+}
+
+.slow-speed-option [type=checkbox]:checked:disabled +
+  .slow-speed-toggle::after {
+  background: var(--google-gray-50);
+}
+
+@media (max-width: 420px) {
+  #download-button {
+    padding-bottom: 12px;
+    padding-top: 12px;
+  }
+
+  .suggested-left > #control-buttons,
+  .suggested-right > #control-buttons {
+    float: none;
+  }
+
+  .snackbar {
+    border-radius: 0;
+    bottom: 0;
+    left: 0;
+    width: 100%;
+  }
+}
+
+@media (max-height: 350px) {
+  h1 {
+    margin: 0 0 15px;
+  }
+
+  .icon-offline {
+    margin: 0 0 10px;
+  }
+
+  .interstitial-wrapper {
+    margin-top: 5%;
+  }
+
+  .nav-wrapper {
+    margin-top: 30px;
+  }
+}
+
+@media (min-width: 420px) and (max-width: 736px) and
+       (min-height: 240px) and (max-height: 420px) and
+       (orientation:landscape) {
+  .interstitial-wrapper {
+    margin-bottom: 100px;
+  }
+}
+
+@media (max-width: 360px) and (max-height: 480px) {
+  .offline .interstitial-wrapper {
+    padding-top: 60px;
+  }
+
+  .offline .runner-container {
+    top: 8px;
+  }
+}
+
+@media (min-height: 240px) and (orientation: landscape) {
+  .offline .interstitial-wrapper {
+    margin-bottom: 90px;
+  }
+
+  .icon-offline {
+    margin-bottom: 20px;
+  }
+}
+
+@media (max-height: 320px) and (orientation: landscape) {
+  .icon-offline {
+    margin-bottom: 0;
+  }
+
+  .offline .runner-container {
+    top: 10px;
+  }
+}
+
+@media (max-width: 240px) {
+  button {
+    padding-inline-end: 12px;
+    padding-inline-start: 12px;
+  }
+
+  .interstitial-wrapper {
+    overflow: inherit;
+    padding: 0 8px;
+  }
+}
+
+@media (max-width: 120px) {
+  button {
+    width: auto;
+  }
+}
+
+.arcade-mode,
+.arcade-mode .runner-container,
+.arcade-mode .runner-canvas {
+  image-rendering: pixelated;
+  max-width: 100%;
+  overflow: hidden;
+}
+
+.arcade-mode #buttons,
+.arcade-mode #main-content {
+  opacity: 0;
+  overflow: hidden;
+}
+
+.arcade-mode .interstitial-wrapper {
+  height: 100vh;
+  max-width: 100%;
+  overflow: hidden;
+}
+
+.arcade-mode .runner-container {
+  left: 0;
+  margin: auto;
+  right: 0;
+  transform-origin: top center;
+  transition: transform 250ms cubic-bezier(0.4, 0, 1, 1) 400ms;
+  z-index: 2;
+}
+
+@media (prefers-color-scheme: dark) {
+  .icon {
+    filter: invert(1);
+  }
+
+  .offline .runner-canvas {
+    filter: invert(1);
+  }
+
+  .offline.inverted {
+    background-color: var(--background-color);
+    filter: invert(0);
+  }
+
+  .offline.inverted body {
+    background-color: #fff;
+  }
+
+  .offline.inverted .offline-runner-live-region {
+    color: #fff;
+  }
+
+  #suggestions-list a {
+    color: var(--link-color);
+  }
+
+  #error-information-button {
+    filter: invert(0.6);
+  }
+
+  .slow-speed-option {
+    background: var(--google-gray-800);
+    color: var(--google-gray-100);
+  }
+
+  .slow-speed-option .slow-speed-toggle::before,
+  .slow-speed-option [type=checkbox]:checked:disabled +
+    .slow-speed-toggle::before {
+     background: rgb(189,193,198);
+  }
+
+  .slow-speed-option [type=checkbox]:checked + .slow-speed-toggle::after,
+  .slow-speed-option [type=checkbox]:checked + .slow-speed-toggle::before {
+    background: var(--google-blue-300);
+  }
+}
+</style>
+  <script>(function(){function l(a,b,c){return Function.prototype.call.apply(Array.prototype.slice,arguments)}function m(a,b,c){var e=l(arguments,2);return function(){return b.apply(a,e)}}function n(a,b){var c=new p(b);for(c.h=[a];c.h.length;){var e=c,d=c.h.shift();e.i(d);for(d=d.firstChild;d;d=d.nextSibling)1==d.nodeType&&e.h.push(d);}}function p(a){this.i=a;}function q(a){a.style.display="";}function r(a){a.style.display="none";}var t=/\s*;\s*/;function u(a,b){this.l.apply(this,arguments);}u.prototype.l=function(a,b){this.a||(this.a={});if(b){var c=this.a,e=b.a;for(d in e)c[d]=e[d];}else {var d=this.a;e=v;for(c in e)d[c]=e[c];}this.a.$this=a;this.a.$context=this;this.f="undefined"!=typeof a&&null!=a?a:"";b||(this.a.$top=this.f);};var v={$default:null},w=[];function x(a){for(var b in a.a)delete a.a[b];a.f=null;w.push(a);}function y(a,b,c){try{return b.call(c,a.a,a.f)}catch(e){return v.$default}}
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+function S(a,b){var c=document;if(b){var e=c.getElementById(a);if(!e){e=b();var d=c.getElementById("jsts");d||(d=c.createElement("div"),d.id="jsts",r(d),d.style.position="absolute",c.body.appendChild(d));var g=c.createElement("div");d.appendChild(g);g.innerHTML=e;e=c.getElementById(a);}c=e;}else c=c.getElementById(a);return c?(L(c),c=c.cloneNode(!0),c.removeAttribute("id"),c):null}function T(a,b,c){c==b.length-1?a.setAttribute("jsinstance","*"+c):a.setAttribute("jsinstance",""+c);}window.jstGetTemplate=S;window.JsEvalContext=u;window.jstProcess=function(a,b){var c=new F;L(b);c.m=b?9==b.nodeType?b:b.ownerDocument||document:document;var e=m(c,c.g,a,b),d=c.j=[],g=c.o=[];c.c=[];e();for(var h,f,k;d.length;)h=d[d.length-1],e=g[g.length-1],e>=h.length?(e=c,f=d.pop(),f.length=0,e.c.push(f),g.pop()):(f=h[e++],k=h[e++],h=h[e++],g[g.length-1]=e,f.call(c,k,h));};
+})();
+
+// Copyright 2017 The Chromium Authors
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+
+const HIDDEN_CLASS$1 = 'hidden';
+
+// 
+
+//
+
+// Copyright 2015 The Chromium Authors
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+
+let mobileNav = false;
+
+/**
+ * For small screen mobile the navigation buttons are moved
+ * below the advanced text.
+ */
+function onResize() {
+  const helpOuterBox = document.querySelector('#details');
+  const mainContent = document.querySelector('#main-content');
+  const mediaQuery = '(min-width: 240px) and (max-width: 420px) and ' +
+      '(min-height: 401px), ' +
+      '(max-height: 560px) and (min-height: 240px) and ' +
+      '(min-width: 421px)';
+
+  const detailsHidden = helpOuterBox.classList.contains(HIDDEN_CLASS$1);
+  const runnerContainer = document.querySelector('.runner-container');
+
+  // Check for change in nav status.
+  if (mobileNav !== window.matchMedia(mediaQuery).matches) {
+    mobileNav = !mobileNav;
+
+    // Handle showing the top content / details sections according to state.
+    if (mobileNav) {
+      mainContent.classList.toggle(HIDDEN_CLASS$1, !detailsHidden);
+      helpOuterBox.classList.toggle(HIDDEN_CLASS$1, detailsHidden);
+      if (runnerContainer) {
+        runnerContainer.classList.toggle(HIDDEN_CLASS$1, !detailsHidden);
+      }
+    } else if (!detailsHidden) {
+      // Non mobile nav with visible details.
+      mainContent.classList.remove(HIDDEN_CLASS$1);
+      helpOuterBox.classList.remove(HIDDEN_CLASS$1);
+      if (runnerContainer) {
+        runnerContainer.classList.remove(HIDDEN_CLASS$1);
+      }
+    }
+  }
+}
+
+function setupMobileNav() {
+  window.addEventListener('resize', onResize);
+  onResize();
+}
+
+document.addEventListener('DOMContentLoaded', setupMobileNav);
+
+// Copyright 2022 The Chromium Authors
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+/**
+ * Verify |value| is truthy.
+ * @param value A value to check for truthiness. Note that this
+ *     may be used to test whether |value| is defined or not, and we don't want
+ *     to force a cast to boolean.
+ */
+function assert(value, message) {
+    if (value) {
+        return;
+    }
+    throw new Error('Assertion failed' + (message ? `: ${message}` : ''));
+}
+
+// Copyright 2022 The Chromium Authors
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+/**
+ * @fileoverview This file defines a singleton which provides access to all data
+ * that is available as soon as the page's resources are loaded (before DOM
+ * content has finished loading). This data includes both localized strings and
+ * any data that is important to have ready from a very early stage (e.g. things
+ * that must be displayed right away).
+ *
+ * Note that loadTimeData is not guaranteed to be consistent between page
+ * refreshes (https://crbug.com/740629) and should not contain values that might
+ * change if the page is re-opened later.
+ */
+class LoadTimeData {
+    data_ = null;
+    /**
+     * Sets the backing object.
+     *
+     * Note that there is no getter for |data_| to discourage abuse of the form:
+     *
+     *     var value = loadTimeData.data()['key'];
+     */
+    set data(value) {
+        assert(!this.data_, 'Re-setting data.');
+        this.data_ = value;
+    }
+    /**
+     * @param id An ID of a value that might exist.
+     * @return True if |id| is a key in the dictionary.
+     */
+    valueExists(id) {
+        assert(this.data_, 'No data. Did you remember to include strings.js?');
+        return id in this.data_;
+    }
+    /**
+     * Fetches a value, expecting that it exists.
+     * @param id The key that identifies the desired value.
+     * @return The corresponding value.
+     */
+    getValue(id) {
+        assert(this.data_, 'No data. Did you remember to include strings.js?');
+        const value = this.data_[id];
+        assert(typeof value !== 'undefined', 'Could not find value for ' + id);
+        return value;
+    }
+    /**
+     * As above, but also makes sure that the value is a string.
+     * @param id The key that identifies the desired string.
+     * @return The corresponding string value.
+     */
+    getString(id) {
+        const value = this.getValue(id);
+        assert(typeof value === 'string', `[${value}] (${id}) is not a string`);
+        return value;
+    }
+    /**
+     * Returns a formatted localized string where $1 to $9 are replaced by the
+     * second to the tenth argument.
+     * @param id The ID of the string we want.
+     * @param args The extra values to include in the formatted output.
+     * @return The formatted string.
+     */
+    getStringF(id, ...args) {
+        const value = this.getString(id);
+        if (!value) {
+            return '';
+        }
+        return this.substituteString(value, ...args);
+    }
+    /**
+     * Returns a formatted localized string where $1 to $9 are replaced by the
+     * second to the tenth argument. Any standalone $ signs must be escaped as
+     * $$.
+     * @param label The label to substitute through. This is not an resource ID.
+     * @param args The extra values to include in the formatted output.
+     * @return The formatted string.
+     */
+    substituteString(label, ...args) {
+        return label.replace(/\$(.|$|\n)/g, function (m) {
+            assert(m.match(/\$[$1-9]/), 'Unescaped $ found in localized string.');
+            if (m === '$$') {
+                return '$';
+            }
+            const substitute = args[Number(m[1]) - 1];
+            if (substitute === undefined || substitute === null) {
+                // Not all callers actually provide values for all substitutes. Return
+                // an empty value for this case.
+                return '';
+            }
+            return substitute.toString();
+        });
+    }
+    /**
+     * Returns a formatted string where $1 to $9 are replaced by the second to
+     * tenth argument, split apart into a list of pieces describing how the
+     * substitution was performed. Any standalone $ signs must be escaped as $$.
+     * @param label A localized string to substitute through.
+     *     This is not an resource ID.
+     * @param args The extra values to include in the formatted output.
+     * @return The formatted string pieces.
+     */
+    getSubstitutedStringPieces(label, ...args) {
+        // Split the string by separately matching all occurrences of $1-9 and of
+        // non $1-9 pieces.
+        const pieces = (label.match(/(\$[1-9])|(([^$]|\$([^1-9]|$))+)/g) ||
+            []).map(function (p) {
+            // Pieces that are not $1-9 should be returned after replacing $$
+            // with $.
+            if (!p.match(/^\$[1-9]$/)) {
+                assert((p.match(/\$/g) || []).length % 2 === 0, 'Unescaped $ found in localized string.');
+                return { value: p.replace(/\$\$/g, '$'), arg: null };
+            }
+            // Otherwise, return the substitution value.
+            const substitute = args[Number(p[1]) - 1];
+            if (substitute === undefined || substitute === null) {
+                // Not all callers actually provide values for all substitutes. Return
+                // an empty value for this case.
+                return { value: '', arg: p };
+            }
+            return { value: substitute.toString(), arg: p };
+        });
+        return pieces;
+    }
+    /**
+     * As above, but also makes sure that the value is a boolean.
+     * @param id The key that identifies the desired boolean.
+     * @return The corresponding boolean value.
+     */
+    getBoolean(id) {
+        const value = this.getValue(id);
+        assert(typeof value === 'boolean', `[${value}] (${id}) is not a boolean`);
+        return value;
+    }
+    /**
+     * As above, but also makes sure that the value is an integer.
+     * @param id The key that identifies the desired number.
+     * @return The corresponding number value.
+     */
+    getInteger(id) {
+        const value = this.getValue(id);
+        assert(typeof value === 'number', `[${value}] (${id}) is not a number`);
+        assert(value === Math.floor(value), 'Number isn\'t integer: ' + value);
+        return value;
+    }
+    /**
+     * Override values in loadTimeData with the values found in |replacements|.
+     * @param replacements The dictionary object of keys to replace.
+     */
+    overrideValues(replacements) {
+        assert(typeof replacements === 'object', 'Replacements must be a dictionary object.');
+        assert(this.data_, 'Data must exist before being overridden');
+        for (const key in replacements) {
+            this.data_[key] = replacements[key];
+        }
+    }
+    /**
+     * Reset loadTimeData's data. Should only be used in tests.
+     * @param newData The data to restore to, when null restores to unset state.
+     */
+    resetForTesting(newData = null) {
+        this.data_ = newData;
+    }
+    /**
+     * @return Whether loadTimeData.data has been set.
+     */
+    isInitialized() {
+        return this.data_ !== null;
+    }
+}
+const loadTimeData = new LoadTimeData();
+
+// Copyright 2023 The Chromium Authors
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+const HIDDEN_CLASS = 'hidden';
+
+// Copyright 2021 The Chromium Authors
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+/* @const
+ * Add matching sprite definition and config to spriteDefinitionByType.
+ */
+const GAME_TYPE = ['altgame'];
+
+//******************************************************************************
+
+/**
+ * Collision box object.
+ * @param {number} x X position.
+ * @param {number} y Y Position.
+ * @param {number} w Width.
+ * @param {number} h Height.
+ * @constructor
+ */
+function CollisionBox(x, y, w, h) {
+  this.x = x;
+  this.y = y;
+  this.width = w;
+  this.height = h;
+}
+
+/**
+ * T-Rex runner sprite definitions.
+ */
+const spriteDefinitionByType = {
+  original: {
+    LDPI: {
+      BACKGROUND_EL: {x: 86, y: 2},
+      CACTUS_LARGE: {x: 332, y: 2},
+      CACTUS_SMALL: {x: 228, y: 2},
+      OBSTACLE_2: {x: 332, y: 2},
+      OBSTACLE: {x: 228, y: 2},
+      CLOUD: {x: 86, y: 2},
+      HORIZON: {x: 2, y: 54},
+      MOON: {x: 484, y: 2},
+      PTERODACTYL: {x: 134, y: 2},
+      RESTART: {x: 2, y: 68},
+      TEXT_SPRITE: {x: 655, y: 2},
+      TREX: {x: 848, y: 2},
+      STAR: {x: 645, y: 2},
+      COLLECTABLE: {x: 0, y: 0},
+      ALT_GAME_END: {x: 32, y: 0},
+    },
+    HDPI: {
+      BACKGROUND_EL: {x: 166, y: 2},
+      CACTUS_LARGE: {x: 652, y: 2},
+      CACTUS_SMALL: {x: 446, y: 2},
+      OBSTACLE_2: {x: 652, y: 2},
+      OBSTACLE: {x: 446, y: 2},
+      CLOUD: {x: 166, y: 2},
+      HORIZON: {x: 2, y: 104},
+      MOON: {x: 954, y: 2},
+      PTERODACTYL: {x: 260, y: 2},
+      RESTART: {x: 2, y: 130},
+      TEXT_SPRITE: {x: 1294, y: 2},
+      TREX: {x: 1678, y: 2},
+      STAR: {x: 1276, y: 2},
+      COLLECTABLE: {x: 0, y: 0},
+      ALT_GAME_END: {x: 64, y: 0},
+    },
+    MAX_GAP_COEFFICIENT: 1.5,
+    MAX_OBSTACLE_LENGTH: 3,
+    HAS_CLOUDS: 1,
+    BOTTOM_PAD: 10,
+    TREX: {
+      WAITING_1: {x: 44, w: 44, h: 47, xOffset: 0},
+      WAITING_2: {x: 0, w: 44, h: 47, xOffset: 0},
+      RUNNING_1: {x: 88, w: 44, h: 47, xOffset: 0},
+      RUNNING_2: {x: 132, w: 44, h: 47, xOffset: 0},
+      JUMPING: {x: 0, w: 44, h: 47, xOffset: 0},
+      CRASHED: {x: 220, w: 44, h: 47, xOffset: 0},
+      COLLISION_BOXES: [
+        new CollisionBox(22, 0, 17, 16),
+        new CollisionBox(1, 18, 30, 9),
+        new CollisionBox(10, 35, 14, 8),
+        new CollisionBox(1, 24, 29, 5),
+        new CollisionBox(5, 30, 21, 4),
+        new CollisionBox(9, 34, 15, 4),
+      ],
+    },
+    /** @type {Array<ObstacleType>} */
+    OBSTACLES: [
+      {
+        type: 'CACTUS_SMALL',
+        width: 17,
+        height: 35,
+        yPos: 105,
+        multipleSpeed: 4,
+        minGap: 120,
+        minSpeed: 0,
+        collisionBoxes: [
+          new CollisionBox(0, 7, 5, 27),
+          new CollisionBox(4, 0, 6, 34),
+          new CollisionBox(10, 4, 7, 14),
+        ],
+      },
+      {
+        type: 'CACTUS_LARGE',
+        width: 25,
+        height: 50,
+        yPos: 90,
+        multipleSpeed: 7,
+        minGap: 120,
+        minSpeed: 0,
+        collisionBoxes: [
+          new CollisionBox(0, 12, 7, 38),
+          new CollisionBox(8, 0, 7, 49),
+          new CollisionBox(13, 10, 10, 38),
+        ],
+      },
+      {
+        type: 'PTERODACTYL',
+        width: 46,
+        height: 40,
+        yPos: [100, 75, 50],    // Variable height.
+        yPosMobile: [100, 50],  // Variable height mobile.
+        multipleSpeed: 999,
+        minSpeed: 8.5,
+        minGap: 150,
+        collisionBoxes: [
+          new CollisionBox(15, 15, 16, 5),
+          new CollisionBox(18, 21, 24, 6),
+          new CollisionBox(2, 14, 4, 3),
+          new CollisionBox(6, 10, 4, 7),
+          new CollisionBox(10, 8, 6, 9),
+        ],
+        numFrames: 2,
+        frameRate: 1000 / 6,
+        speedOffset: .8,
+      },
+      {
+        type: 'COLLECTABLE',
+        width: 31,
+        height: 24,
+        yPos: 104,
+        multipleSpeed: 1000,
+        minGap: 9999,
+        minSpeed: 0,
+        collisionBoxes: [
+          new CollisionBox(0, 0, 32, 25),
+        ],
+      },
+    ],
+    BACKGROUND_EL: {
+      'CLOUD': {
+        HEIGHT: 14,
+        MAX_CLOUD_GAP: 400,
+        MAX_SKY_LEVEL: 30,
+        MIN_CLOUD_GAP: 100,
+        MIN_SKY_LEVEL: 71,
+        OFFSET: 4,
+        WIDTH: 46,
+        X_POS: 1,
+        Y_POS: 120,
+      },
+    },
+    BACKGROUND_EL_CONFIG: {
+      MAX_BG_ELS: 1,
+      MAX_GAP: 400,
+      MIN_GAP: 100,
+      POS: 0,
+      SPEED: 0.5,
+      Y_POS: 125,
+    },
+    LINES: [
+      {SOURCE_X: 2, SOURCE_Y: 52, WIDTH: 600, HEIGHT: 12, YPOS: 127},
+    ],
+    ALT_GAME_OVER_TEXT_CONFIG: {
+      TEXT_X: 32,
+      TEXT_Y: 0,
+      TEXT_WIDTH: 246,
+      TEXT_HEIGHT: 17,
+      FLASH_DURATION: 1500,
+      FLASHING: false,
+    },
+  },
+  altgame: {
+    LDPI: {
+      BACKGROUND_EL: {x: 260, y: 19},
+      OBSTACLE1: {x: 152, y: 65},
+      OBSTACLE2: {x: 188, y: 65},
+      OBSTACLE3: {x: 152, y: 65},
+      OBSTACLE4: {x: 188, y: 65},
+      OBSTACLE5: {x: 0, y: 60},
+      OBSTACLE6: {x: 42, y: 58},
+      OBSTACLE7: {x: 98, y: 58},
+      OBSTACLE8: {x: 96, y: 19},
+      HORIZON: {x: 0, y: 3},
+      TREX: {x: 557, y: 63},
+      COLLECTABLE: {x: 193, y: 19},
+    },
+    HDPI: {
+      BACKGROUND_EL: {x: 520, y: 38},
+      OBSTACLE1: {x: 304, y: 130},
+      OBSTACLE2: {x: 376, y: 130},
+      OBSTACLE3: {x: 304, y: 130},
+      OBSTACLE4: {x: 376, y: 130},
+      OBSTACLE5: {x: 0, y: 120},
+      OBSTACLE6: {x: 84, y: 116},
+      OBSTACLE7: {x: 196, y: 116},
+      OBSTACLE8: {x: 192, y: 38},
+      HORIZON: {x: 0, y: 6},
+      TREX: {x: 1114, y: 126},
+      COLLECTABLE: {x: 386, y: 38},
+    },
+    MAX_GAP_COEFFICIENT: 1.5,
+    MAX_OBSTACLE_LENGTH: 2,
+    HAS_CLOUDS: 0,
+    BOTTOM_PAD: 10,
+    TREX: {
+      MAX_JUMP_HEIGHT: 50,
+      MIN_JUMP_HEIGHT: 40,
+      INITIAL_JUMP_VELOCITY: -10,
+      RUNNING_1: {x: 96, w: 49, h: 47, xOffset: 0},
+      RUNNING_2: {x: 145, w: 49, h: 47, xOffset: 0},
+      JUMPING: {x: 47, w: 49, h: 47, xOffset: 0},
+      CRASHED: {x: 194, w: 62, h: 47, xOffset: 0},
+      DUCKING_1: {x: 257, w: 55, h: 26, xOffset: 0},
+      DUCKING_2: {x: 316, w: 55, h: 26, xOffset: 0},
+      COLLISION_BOXES: [
+        new CollisionBox(22, 0, 17, 16),
+        new CollisionBox(1, 18, 30, 9),
+        new CollisionBox(10, 35, 14, 8),
+        new CollisionBox(1, 24, 29, 5),
+        new CollisionBox(5, 30, 21, 4),
+        new CollisionBox(9, 34, 15, 4),
+      ],
+    },
+    /** @type {Array<ObstacleType>} */
+    OBSTACLES: [
+      {
+        type: 'OBSTACLE1',
+        width: 36,
+        height: 45,
+        yPos: 95,
+        multipleSpeed: 999,
+        minGap: 120,
+        minSpeed: 0,
+        collisionBoxes: [
+          new CollisionBox(0, 17, 8, 28),
+          new CollisionBox(6, 3, 24, 42),
+          new CollisionBox(28, 17, 8, 28),
+        ],
+      },
+      {
+        type: 'OBSTACLE2',
+        width: 36,
+        height: 45,
+        yPos: 95,
+        multipleSpeed: 999,
+        minGap: 120,
+        minSpeed: 0,
+        collisionBoxes: [
+          new CollisionBox(0, 17, 8, 28),
+          new CollisionBox(6, 3, 24, 42),
+          new CollisionBox(28, 17, 8, 28),
+        ],
+      },
+      {
+        type: 'OBSTACLE3',
+        width: 72,
+        height: 45,
+        yPos: 95,
+        multipleSpeed: 999,
+        minGap: 120,
+        minSpeed: 8,
+        collisionBoxes: [
+          new CollisionBox(0, 17, 8, 28),
+          new CollisionBox(6, 3, 24, 42),
+          new CollisionBox(28, 17, 8, 28),
+          new CollisionBox(36, 17, 8, 28),
+          new CollisionBox(42, 3, 24, 42),
+          new CollisionBox(64, 17, 8, 28),
+        ],
+      },
+      {
+        type: 'OBSTACLE4',
+        width: 72,
+        height: 45,
+        yPos: 95,
+        multipleSpeed: 999,
+        minGap: 120,
+        minSpeed: 8,
+        collisionBoxes: [
+          new CollisionBox(0, 17, 8, 28),
+          new CollisionBox(6, 3, 24, 42),
+          new CollisionBox(28, 17, 8, 28),
+          new CollisionBox(36, 17, 8, 28),
+          new CollisionBox(42, 3, 24, 42),
+          new CollisionBox(64, 17, 8, 28),
+        ],
+      },
+      {
+        type: 'OBSTACLE5',
+        width: 42,
+        height: 50,
+        yPos: 95,
+        multipleSpeed: 999,
+        minGap: 120,
+        minSpeed: 5,
+        collisionBoxes: [
+          new CollisionBox(0, 0, 42, 50),
+        ],
+      },
+      {
+        type: 'OBSTACLE6',
+        width: 56,
+        height: 52,
+        yPos: 93,
+        multipleSpeed: 999,
+        minGap: 120,
+        minSpeed: 7,
+        collisionBoxes: [
+          new CollisionBox(0, 11, 8, 40),
+          new CollisionBox(8, 0, 19, 51),
+          new CollisionBox(27, 11, 28, 40),
+        ],
+      },
+      {
+        type: 'OBSTACLE7',
+        width: 54,
+        height: 52,
+        yPos: 93,
+        multipleSpeed: 999,
+        minGap: 120,
+        minSpeed: 6,
+        collisionBoxes: [
+          new CollisionBox(0, 11, 19, 40),
+          new CollisionBox(19, 0, 19, 51),
+          new CollisionBox(38, 14, 15, 37),
+        ],
+      },
+      {
+        type: 'OBSTACLE8',
+        width: 49,
+        height: 20,
+        yPos: [100, 75, 50],    // Variable height.
+        yPosMobile: [100, 50],  // Variable height mobile.
+        multipleSpeed: 999,
+        minSpeed: 8.5,
+        minGap: 150,
+        collisionBoxes: [
+          new CollisionBox(15, 15, 16, 5),
+          new CollisionBox(18, 21, 24, 6),
+          new CollisionBox(2, 14, 4, 3),
+          new CollisionBox(6, 10, 4, 7),
+          new CollisionBox(10, 8, 6, 9),
+        ],
+        numFrames: 2,
+        frameRate: 1000 / 6,
+        speedOffset: .8,
+      },
+    ],
+    BACKGROUND_EL: {
+      'GROUP1': {
+        HEIGHT: 91,
+        MAX_CLOUD_GAP: 600,
+        MAX_SKY_LEVEL: 0,
+        MIN_CLOUD_GAP: 300,
+        MIN_SKY_LEVEL: 0,
+        OFFSET: 11,
+        WIDTH: 131,
+        X_POS: 260,
+      },
+      'GROUP2': {
+        HEIGHT: 91,
+        MAX_CLOUD_GAP: 600,
+        MAX_SKY_LEVEL: 0,
+        MIN_CLOUD_GAP: 300,
+        MIN_SKY_LEVEL: 0,
+        OFFSET: 11,
+        WIDTH: 166,
+        X_POS: 391,
+      },
+    },
+    BACKGROUND_EL_CONFIG: {
+      MAX_BG_ELS: 8,
+      MAX_GAP: 600,
+      MIN_GAP: 300,
+      POS: 0,
+      SPEED: 0.8,
+      Y_POS: 122,
+    },
+    LINES: [
+      {SOURCE_X: 2, SOURCE_Y: 3, WIDTH: 600, HEIGHT: 12, YPOS: 128},
+    ],
+  },
+};
+
+// Copyright 2014 The Chromium Authors
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+
+/**
+ * T-Rex runner.
+ * @param {string} outerContainerId Outer containing element id.
+ * @param {!Object=} opt_config
+ * @constructor
+ * @implements {EventListener}
+ * @export
+ */
+function Runner(outerContainerId, opt_config) {
+  // Singleton
+  if (Runner.instance_) {
+    return Runner.instance_;
+  }
+  Runner.instance_ = this;
+
+  this.outerContainerEl = document.querySelector(outerContainerId);
+  this.containerEl = null;
+  this.snackbarEl = null;
+  // A div to intercept touch events. Only set while (playing && useTouch).
+  this.touchController = null;
+
+  this.config = opt_config || Object.assign(Runner.config, Runner.normalConfig);
+  // Logical dimensions of the container.
+  this.dimensions = Runner.defaultDimensions;
+
+  this.gameType = null;
+  Runner.spriteDefinition = spriteDefinitionByType['original'];
+
+  this.altGameImageSprite = null;
+  this.altGameModeActive = false;
+  this.altGameModeFlashTimer = null;
+  this.fadeInTimer = 0;
+
+  this.canvas = null;
+  this.canvasCtx = null;
+
+  this.tRex = null;
+
+  this.distanceMeter = null;
+  this.distanceRan = 0;
+
+  this.highestScore = 0;
+  this.syncHighestScore = false;
+
+  this.time = 0;
+  this.runningTime = 0;
+  this.msPerFrame = 1000 / FPS;
+  this.currentSpeed = this.config.SPEED;
+  Runner.slowDown = false;
+
+  this.obstacles = [];
+
+  this.activated = false; // Whether the easter egg has been activated.
+  this.playing = false; // Whether the game is currently in play state.
+  this.crashed = false;
+  this.paused = false;
+  this.inverted = false;
+  this.invertTimer = 0;
+  this.resizeTimerId_ = null;
+
+  this.playCount = 0;
+
+  // Sound FX.
+  this.audioBuffer = null;
+
+  /** @type {Object} */
+  this.soundFx = {};
+  this.generatedSoundFx = null;
+
+  // Global web audio context for playing sounds.
+  this.audioContext = null;
+
+  // Images.
+  this.images = {};
+  this.imagesLoaded = 0;
+
+  // Gamepad state.
+  this.pollingGamepads = false;
+  this.gamepadIndex = undefined;
+  this.previousGamepad = null;
+
+  if (this.isDisabled()) {
+    this.setupDisabledRunner();
+  } else {
+    if (Runner.isAltGameModeEnabled()) {
+      this.initAltGameType();
+      Runner.gameType = this.gameType;
+    }
+    this.loadImages();
+
+    window['initializeEasterEggHighScore'] =
+        this.initializeHighScore.bind(this);
+  }
+}
+
+/**
+ * Default game width.
+ * @const
+ */
+const DEFAULT_WIDTH = 600;
+
+/**
+ * Frames per second.
+ * @const
+ */
+const FPS = 60;
+
+/** @const */
+const IS_HIDPI = window.devicePixelRatio > 1;
+
+/** @const */
+const IS_IOS = /CriOS/.test(window.navigator.userAgent);
+
+/** @const */
+const IS_MOBILE = /Android/.test(window.navigator.userAgent) || IS_IOS;
+
+/** @const */
+const IS_RTL = document.querySelector('html').dir == 'rtl';
+
+/** @const */
+const ARCADE_MODE_URL = 'chrome://dino/';
+
+/** @const */
+const RESOURCE_POSTFIX = 'offline-resources-';
+
+/** @const */
+const A11Y_STRINGS = {
+  ariaLabel: 'dinoGameA11yAriaLabel',
+  description: 'dinoGameA11yDescription',
+  gameOver: 'dinoGameA11yGameOver',
+  highScore: 'dinoGameA11yHighScore',
+  jump: 'dinoGameA11yJump',
+  started: 'dinoGameA11yStartGame',
+  speedLabel: 'dinoGameA11ySpeedToggle',
+};
+
+/**
+ * Default game configuration.
+ * Shared config for all  versions of the game. Additional parameters are
+ * defined in Runner.normalConfig and Runner.slowConfig.
+ */
+Runner.config = {
+  AUDIOCUE_PROXIMITY_THRESHOLD: 190,
+  AUDIOCUE_PROXIMITY_THRESHOLD_MOBILE_A11Y: 250,
+  BG_CLOUD_SPEED: 0.2,
+  BOTTOM_PAD: 10,
+  // Scroll Y threshold at which the game can be activated.
+  CANVAS_IN_VIEW_OFFSET: -10,
+  CLEAR_TIME: 3000,
+  CLOUD_FREQUENCY: 0.5,
+  FADE_DURATION: 1,
+  FLASH_DURATION: 1000,
+  GAMEOVER_CLEAR_TIME: 1200,
+  INITIAL_JUMP_VELOCITY: 12,
+  INVERT_FADE_DURATION: 12000,
+  MAX_BLINK_COUNT: 3,
+  MAX_CLOUDS: 6,
+  MAX_OBSTACLE_LENGTH: 3,
+  MAX_OBSTACLE_DUPLICATION: 2,
+  RESOURCE_TEMPLATE_ID: 'audio-resources',
+  SPEED: 6,
+  SPEED_DROP_COEFFICIENT: 3,
+  ARCADE_MODE_INITIAL_TOP_POSITION: 35,
+  ARCADE_MODE_TOP_POSITION_PERCENT: 0.1,
+};
+
+Runner.normalConfig = {
+  ACCELERATION: 0.001,
+  AUDIOCUE_PROXIMITY_THRESHOLD: 190,
+  AUDIOCUE_PROXIMITY_THRESHOLD_MOBILE_A11Y: 250,
+  GAP_COEFFICIENT: 0.6,
+  INVERT_DISTANCE: 700,
+  MAX_SPEED: 13,
+  MOBILE_SPEED_COEFFICIENT: 1.2,
+  SPEED: 6,
+};
+
+
+Runner.slowConfig = {
+  ACCELERATION: 0.0005,
+  AUDIOCUE_PROXIMITY_THRESHOLD: 170,
+  AUDIOCUE_PROXIMITY_THRESHOLD_MOBILE_A11Y: 220,
+  GAP_COEFFICIENT: 0.3,
+  INVERT_DISTANCE: 350,
+  MAX_SPEED: 9,
+  MOBILE_SPEED_COEFFICIENT: 1.5,
+  SPEED: 4.2,
+};
+
+
+/**
+ * Default dimensions.
+ */
+Runner.defaultDimensions = {
+  WIDTH: DEFAULT_WIDTH,
+  HEIGHT: 150,
+};
+
+
+/**
+ * CSS class names.
+ * @enum {string}
+ */
+Runner.classes = {
+  ARCADE_MODE: 'arcade-mode',
+  CANVAS: 'runner-canvas',
+  CONTAINER: 'runner-container',
+  CRASHED: 'crashed',
+  ICON: 'icon-offline',
+  INVERTED: 'inverted',
+  SNACKBAR: 'snackbar',
+  SNACKBAR_SHOW: 'snackbar-show',
+  TOUCH_CONTROLLER: 'controller',
+};
+
+
+/**
+ * Sound FX. Reference to the ID of the audio tag on interstitial page.
+ * @enum {string}
+ */
+Runner.sounds = {
+  BUTTON_PRESS: 'offline-sound-press',
+  HIT: 'offline-sound-hit',
+  SCORE: 'offline-sound-reached',
+};
+
+
+/**
+ * Key code mapping.
+ * @enum {Object}
+ */
+Runner.keycodes = {
+  JUMP: {'38': 1, '32': 1},  // Up, spacebar
+  DUCK: {'40': 1},           // Down
+  RESTART: {'13': 1},        // Enter
+};
+
+
+/**
+ * Runner event names.
+ * @enum {string}
+ */
+Runner.events = {
+  ANIM_END: 'webkitAnimationEnd',
+  CLICK: 'click',
+  KEYDOWN: 'keydown',
+  KEYUP: 'keyup',
+  POINTERDOWN: 'pointerdown',
+  POINTERUP: 'pointerup',
+  RESIZE: 'resize',
+  TOUCHEND: 'touchend',
+  TOUCHSTART: 'touchstart',
+  VISIBILITY: 'visibilitychange',
+  BLUR: 'blur',
+  FOCUS: 'focus',
+  LOAD: 'load',
+  GAMEPADCONNECTED: 'gamepadconnected',
+};
+
+Runner.prototype = {
+  /**
+   * Initialize alternative game type.
+   */
+  initAltGameType() {
+    if (GAME_TYPE.length > 0) {
+      this.gameType = loadTimeData && loadTimeData.valueExists('altGameType') ?
+          GAME_TYPE[parseInt(loadTimeData.getValue('altGameType'), 10) - 1] :
+          '';
+    }
+  },
+
+  /**
+   * Whether the easter egg has been disabled. CrOS enterprise enrolled devices.
+   * @return {boolean}
+   */
+  isDisabled() {
+    return loadTimeData && loadTimeData.valueExists('disabledEasterEgg');
+  },
+
+  /**
+   * For disabled instances, set up a snackbar with the disabled message.
+   */
+  setupDisabledRunner() {
+    this.containerEl = document.createElement('div');
+    this.containerEl.className = Runner.classes.SNACKBAR;
+    this.containerEl.textContent = loadTimeData.getValue('disabledEasterEgg');
+    this.outerContainerEl.appendChild(this.containerEl);
+
+    // Show notification when the activation key is pressed.
+    document.addEventListener(Runner.events.KEYDOWN, function(e) {
+      if (Runner.keycodes.JUMP[e.keyCode]) {
+        this.containerEl.classList.add(Runner.classes.SNACKBAR_SHOW);
+        document.querySelector('.icon').classList.add('icon-disabled');
+      }
+    }.bind(this));
+  },
+
+  /**
+   * Setting individual settings for debugging.
+   * @param {string} setting
+   * @param {number|string} value
+   */
+  updateConfigSetting(setting, value) {
+    if (setting in this.config && value !== undefined) {
+      this.config[setting] = value;
+
+      switch (setting) {
+        case 'GRAVITY':
+        case 'MIN_JUMP_HEIGHT':
+        case 'SPEED_DROP_COEFFICIENT':
+          this.tRex.config[setting] = value;
+          break;
+        case 'INITIAL_JUMP_VELOCITY':
+          this.tRex.setJumpVelocity(value);
+          break;
+        case 'SPEED':
+          this.setSpeed(/** @type {number} */ (value));
+          break;
+      }
+    }
+  },
+
+  /**
+   * Creates an on page image element from the base 64 encoded string source.
+   * @param {string} resourceName Name in data object,
+   * @return {HTMLImageElement} The created element.
+   */
+  createImageElement(resourceName) {
+    const imgSrc = loadTimeData && loadTimeData.valueExists(resourceName) ?
+        loadTimeData.getString(resourceName) :
+        null;
+
+    if (imgSrc) {
+      const el =
+          /** @type {HTMLImageElement} */ (document.createElement('img'));
+      el.id = resourceName;
+      el.src = imgSrc;
+      document.getElementById('offline-resources').appendChild(el);
+      return el;
+    }
+    return null;
+  },
+
+  /**
+   * Cache the appropriate image sprite from the page and get the sprite sheet
+   * definition.
+   */
+  loadImages() {
+    let scale = '1x';
+    this.spriteDef = Runner.spriteDefinition.LDPI;
+    if (IS_HIDPI) {
+      scale = '2x';
+      this.spriteDef = Runner.spriteDefinition.HDPI;
+    }
+
+    Runner.imageSprite = /** @type {HTMLImageElement} */
+        (document.getElementById(RESOURCE_POSTFIX + scale));
+
+    if (this.gameType) {
+      Runner.altGameImageSprite = /** @type {HTMLImageElement} */
+          (this.createImageElement('altGameSpecificImage' + scale));
+      Runner.altCommonImageSprite = /** @type {HTMLImageElement} */
+          (this.createImageElement('altGameCommonImage' + scale));
+    }
+    Runner.origImageSprite = Runner.imageSprite;
+
+    // Disable the alt game mode if the sprites can't be loaded.
+    if (!Runner.altGameImageSprite || !Runner.altCommonImageSprite) {
+      Runner.isAltGameModeEnabled = () => false;
+      this.altGameModeActive = false;
+    }
+
+    if (Runner.imageSprite.complete) {
+      this.init();
+    } else {
+      // If the images are not yet loaded, add a listener.
+      Runner.imageSprite.addEventListener(Runner.events.LOAD,
+          this.init.bind(this));
+    }
+  },
+
+  /**
+   * Load and decode base 64 encoded sounds.
+   */
+  loadSounds() {
+    if (!IS_IOS) {
+      this.audioContext = new AudioContext();
+
+      const resourceTemplate =
+          document.getElementById(this.config.RESOURCE_TEMPLATE_ID).content;
+
+      for (const sound in Runner.sounds) {
+        let soundSrc =
+            resourceTemplate.getElementById(Runner.sounds[sound]).src;
+        soundSrc = soundSrc.substr(soundSrc.indexOf(',') + 1);
+        const buffer = decodeBase64ToArrayBuffer(soundSrc);
+
+        // Async, so no guarantee of order in array.
+        this.audioContext.decodeAudioData(buffer, function(index, audioData) {
+            this.soundFx[index] = audioData;
+          }.bind(this, sound));
+      }
+    }
+  },
+
+  /**
+   * Sets the game speed. Adjust the speed accordingly if on a smaller screen.
+   * @param {number=} opt_speed
+   */
+  setSpeed(opt_speed) {
+    const speed = opt_speed || this.currentSpeed;
+
+    // Reduce the speed on smaller mobile screens.
+    if (this.dimensions.WIDTH < DEFAULT_WIDTH) {
+      const mobileSpeed = Runner.slowDown ? speed :
+                                            speed * this.dimensions.WIDTH /
+              DEFAULT_WIDTH * this.config.MOBILE_SPEED_COEFFICIENT;
+      this.currentSpeed = mobileSpeed > speed ? speed : mobileSpeed;
+    } else if (opt_speed) {
+      this.currentSpeed = opt_speed;
+    }
+  },
+
+  /**
+   * Game initialiser.
+   */
+  init() {
+    // Hide the static icon.
+    document.querySelector('.' + Runner.classes.ICON).style.visibility =
+        'hidden';
+
+    this.adjustDimensions();
+    this.setSpeed();
+
+    const ariaLabel = getA11yString(A11Y_STRINGS.ariaLabel);
+    this.containerEl = document.createElement('div');
+    this.containerEl.setAttribute('role', IS_MOBILE ? 'button' : 'application');
+    this.containerEl.setAttribute('tabindex', '0');
+    this.containerEl.setAttribute('title', ariaLabel);
+
+    this.containerEl.className = Runner.classes.CONTAINER;
+
+    // Player canvas container.
+    this.canvas = createCanvas(this.containerEl, this.dimensions.WIDTH,
+        this.dimensions.HEIGHT);
+
+    // Live region for game status updates.
+    this.a11yStatusEl = document.createElement('span');
+    this.a11yStatusEl.className = 'offline-runner-live-region';
+    this.a11yStatusEl.setAttribute('aria-live', 'assertive');
+    this.a11yStatusEl.textContent = '';
+    Runner.a11yStatusEl = this.a11yStatusEl;
+
+    // Add checkbox to slow down the game.
+    this.slowSpeedCheckboxLabel = document.createElement('label');
+    this.slowSpeedCheckboxLabel.className = 'slow-speed-option hidden';
+    this.slowSpeedCheckboxLabel.textContent =
+        getA11yString(A11Y_STRINGS.speedLabel);
+
+    this.slowSpeedCheckbox = document.createElement('input');
+    this.slowSpeedCheckbox.setAttribute('type', 'checkbox');
+    this.slowSpeedCheckbox.setAttribute(
+        'title', getA11yString(A11Y_STRINGS.speedLabel));
+    this.slowSpeedCheckbox.setAttribute('tabindex', '0');
+    this.slowSpeedCheckbox.setAttribute('checked', 'checked');
+
+    this.slowSpeedToggleEl = document.createElement('span');
+    this.slowSpeedToggleEl.className = 'slow-speed-toggle';
+
+    this.slowSpeedCheckboxLabel.appendChild(this.slowSpeedCheckbox);
+    this.slowSpeedCheckboxLabel.appendChild(this.slowSpeedToggleEl);
+
+    if (IS_IOS) {
+      this.outerContainerEl.appendChild(this.a11yStatusEl);
+    } else {
+      this.containerEl.appendChild(this.a11yStatusEl);
+    }
+
+    announcePhrase(getA11yString(A11Y_STRINGS.description));
+
+    this.generatedSoundFx = new GeneratedSoundFx();
+
+    this.canvasCtx =
+        /** @type {CanvasRenderingContext2D} */ (this.canvas.getContext('2d'));
+    this.canvasCtx.fillStyle = '#f7f7f7';
+    this.canvasCtx.fill();
+    Runner.updateCanvasScaling(this.canvas);
+
+    // Horizon contains clouds, obstacles and the ground.
+    this.horizon = new Horizon(this.canvas, this.spriteDef, this.dimensions,
+        this.config.GAP_COEFFICIENT);
+
+    // Distance meter
+    this.distanceMeter = new DistanceMeter(this.canvas,
+          this.spriteDef.TEXT_SPRITE, this.dimensions.WIDTH);
+
+    // Draw t-rex
+    this.tRex = new Trex(this.canvas, this.spriteDef.TREX);
+
+    this.outerContainerEl.appendChild(this.containerEl);
+    this.outerContainerEl.appendChild(this.slowSpeedCheckboxLabel);
+
+    this.startListening();
+    this.update();
+
+    window.addEventListener(Runner.events.RESIZE,
+        this.debounceResize.bind(this));
+
+    // Handle dark mode
+    const darkModeMediaQuery =
+        window.matchMedia('(prefers-color-scheme: dark)');
+    this.isDarkMode = darkModeMediaQuery && darkModeMediaQuery.matches;
+    darkModeMediaQuery.addListener((e) => {
+      this.isDarkMode = e.matches;
+    });
+  },
+
+  /**
+   * Create the touch controller. A div that covers whole screen.
+   */
+  createTouchController() {
+    this.touchController = document.createElement('div');
+    this.touchController.className = Runner.classes.TOUCH_CONTROLLER;
+    this.touchController.addEventListener(Runner.events.TOUCHSTART, this);
+    this.touchController.addEventListener(Runner.events.TOUCHEND, this);
+    this.outerContainerEl.appendChild(this.touchController);
+  },
+
+  /**
+   * Debounce the resize event.
+   */
+  debounceResize() {
+    if (!this.resizeTimerId_) {
+      this.resizeTimerId_ =
+          setInterval(this.adjustDimensions.bind(this), 250);
+    }
+  },
+
+  /**
+   * Adjust game space dimensions on resize.
+   */
+  adjustDimensions() {
+    clearInterval(this.resizeTimerId_);
+    this.resizeTimerId_ = null;
+
+    const boxStyles = window.getComputedStyle(this.outerContainerEl);
+    const padding = Number(boxStyles.paddingLeft.substr(0,
+        boxStyles.paddingLeft.length - 2));
+
+    this.dimensions.WIDTH = this.outerContainerEl.offsetWidth - padding * 2;
+    if (this.isArcadeMode()) {
+      this.dimensions.WIDTH = Math.min(DEFAULT_WIDTH, this.dimensions.WIDTH);
+      if (this.activated) {
+        this.setArcadeModeContainerScale();
+      }
+    }
+
+    // Redraw the elements back onto the canvas.
+    if (this.canvas) {
+      this.canvas.width = this.dimensions.WIDTH;
+      this.canvas.height = this.dimensions.HEIGHT;
+
+      Runner.updateCanvasScaling(this.canvas);
+
+      this.distanceMeter.calcXPos(this.dimensions.WIDTH);
+      this.clearCanvas();
+      this.horizon.update(0, 0, true);
+      this.tRex.update(0);
+
+      // Outer container and distance meter.
+      if (this.playing || this.crashed || this.paused) {
+        this.containerEl.style.width = this.dimensions.WIDTH + 'px';
+        this.containerEl.style.height = this.dimensions.HEIGHT + 'px';
+        this.distanceMeter.update(0, Math.ceil(this.distanceRan));
+        this.stop();
+      } else {
+        this.tRex.draw(0, 0);
+      }
+
+      // Game over panel.
+      if (this.crashed && this.gameOverPanel) {
+        this.gameOverPanel.updateDimensions(this.dimensions.WIDTH);
+        this.gameOverPanel.draw(this.altGameModeActive, this.tRex);
+      }
+    }
+  },
+
+  /**
+   * Play the game intro.
+   * Canvas container width expands out to the full width.
+   */
+  playIntro() {
+    if (!this.activated && !this.crashed) {
+      this.playingIntro = true;
+      this.tRex.playingIntro = true;
+
+      // CSS animation definition.
+      const keyframes = '@-webkit-keyframes intro { ' +
+            'from { width:' + Trex.config.WIDTH + 'px }' +
+            'to { width: ' + this.dimensions.WIDTH + 'px }' +
+          '}';
+      document.styleSheets[0].insertRule(keyframes, 0);
+
+      this.containerEl.addEventListener(Runner.events.ANIM_END,
+          this.startGame.bind(this));
+
+      this.containerEl.style.webkitAnimation = 'intro .4s ease-out 1 both';
+      this.containerEl.style.width = this.dimensions.WIDTH + 'px';
+
+      this.setPlayStatus(true);
+      this.activated = true;
+    } else if (this.crashed) {
+      this.restart();
+    }
+  },
+
+
+  /**
+   * Update the game status to started.
+   */
+  startGame() {
+    if (this.isArcadeMode()) {
+      this.setArcadeMode();
+    }
+    this.toggleSpeed();
+    this.runningTime = 0;
+    this.playingIntro = false;
+    this.tRex.playingIntro = false;
+    this.containerEl.style.webkitAnimation = '';
+    this.playCount++;
+    this.generatedSoundFx.background();
+    announcePhrase(getA11yString(A11Y_STRINGS.started));
+
+    if (Runner.audioCues) {
+      this.containerEl.setAttribute('title', getA11yString(A11Y_STRINGS.jump));
+    }
+
+    // Handle tabbing off the page. Pause the current game.
+    document.addEventListener(Runner.events.VISIBILITY,
+          this.onVisibilityChange.bind(this));
+
+    window.addEventListener(Runner.events.BLUR,
+          this.onVisibilityChange.bind(this));
+
+    window.addEventListener(Runner.events.FOCUS,
+          this.onVisibilityChange.bind(this));
+  },
+
+  clearCanvas() {
+    this.canvasCtx.clearRect(0, 0, this.dimensions.WIDTH,
+        this.dimensions.HEIGHT);
+  },
+
+  /**
+   * Checks whether the canvas area is in the viewport of the browser
+   * through the current scroll position.
+   * @return boolean.
+   */
+  isCanvasInView() {
+    return this.containerEl.getBoundingClientRect().top >
+        Runner.config.CANVAS_IN_VIEW_OFFSET;
+  },
+
+  /**
+   * Enable the alt game mode. Switching out the sprites.
+   */
+  enableAltGameMode() {
+    Runner.imageSprite = Runner.altGameImageSprite;
+    Runner.spriteDefinition = spriteDefinitionByType[Runner.gameType];
+
+    if (IS_HIDPI) {
+      this.spriteDef = Runner.spriteDefinition.HDPI;
+    } else {
+      this.spriteDef = Runner.spriteDefinition.LDPI;
+    }
+
+    this.altGameModeActive = true;
+    this.tRex.enableAltGameMode(this.spriteDef.TREX);
+    this.horizon.enableAltGameMode(this.spriteDef);
+    this.generatedSoundFx.background();
+  },
+
+  /**
+   * Update the game frame and schedules the next one.
+   */
+  update() {
+    this.updatePending = false;
+
+    const now = getTimeStamp();
+    let deltaTime = now - (this.time || now);
+
+    // Flashing when switching game modes.
+    if (this.altGameModeFlashTimer < 0 || this.altGameModeFlashTimer === 0) {
+      this.altGameModeFlashTimer = null;
+      this.tRex.setFlashing(false);
+      this.enableAltGameMode();
+    } else if (this.altGameModeFlashTimer > 0) {
+      this.altGameModeFlashTimer -= deltaTime;
+      this.tRex.update(deltaTime);
+      deltaTime = 0;
+    }
+
+    this.time = now;
+
+    if (this.playing) {
+      this.clearCanvas();
+
+      // Additional fade in - Prevents jump when switching sprites
+      if (this.altGameModeActive &&
+          this.fadeInTimer <= this.config.FADE_DURATION) {
+        this.fadeInTimer += deltaTime / 1000;
+        this.canvasCtx.globalAlpha = this.fadeInTimer;
+      } else {
+        this.canvasCtx.globalAlpha = 1;
+      }
+
+      if (this.tRex.jumping) {
+        this.tRex.updateJump(deltaTime);
+      }
+
+      this.runningTime += deltaTime;
+      const hasObstacles = this.runningTime > this.config.CLEAR_TIME;
+
+      // First jump triggers the intro.
+      if (this.tRex.jumpCount === 1 && !this.playingIntro) {
+        this.playIntro();
+      }
+
+      // The horizon doesn't move until the intro is over.
+      if (this.playingIntro) {
+        this.horizon.update(0, this.currentSpeed, hasObstacles);
+      } else if (!this.crashed) {
+        const showNightMode = this.isDarkMode ^ this.inverted;
+        deltaTime = !this.activated ? 0 : deltaTime;
+        this.horizon.update(
+            deltaTime, this.currentSpeed, hasObstacles, showNightMode);
+      }
+
+      // Check for collisions.
+      let collision = hasObstacles &&
+          checkForCollision(this.horizon.obstacles[0], this.tRex);
+
+      // For a11y, audio cues.
+      if (Runner.audioCues && hasObstacles) {
+        const jumpObstacle =
+            this.horizon.obstacles[0].typeConfig.type != 'COLLECTABLE';
+
+        if (!this.horizon.obstacles[0].jumpAlerted) {
+          const threshold = Runner.isMobileMouseInput ?
+              Runner.config.AUDIOCUE_PROXIMITY_THRESHOLD_MOBILE_A11Y :
+              Runner.config.AUDIOCUE_PROXIMITY_THRESHOLD;
+          const adjProximityThreshold = threshold +
+              (threshold * Math.log10(this.currentSpeed / Runner.config.SPEED));
+
+          if (this.horizon.obstacles[0].xPos < adjProximityThreshold) {
+            if (jumpObstacle) {
+              this.generatedSoundFx.jump();
+            }
+            this.horizon.obstacles[0].jumpAlerted = true;
+          }
+        }
+      }
+
+      // Activated alt game mode.
+      if (Runner.isAltGameModeEnabled() && collision &&
+          this.horizon.obstacles[0].typeConfig.type == 'COLLECTABLE') {
+        this.horizon.removeFirstObstacle();
+        this.tRex.setFlashing(true);
+        collision = false;
+        this.altGameModeFlashTimer = this.config.FLASH_DURATION;
+        this.runningTime = 0;
+        this.generatedSoundFx.collect();
+      }
+
+      if (!collision) {
+        this.distanceRan += this.currentSpeed * deltaTime / this.msPerFrame;
+
+        if (this.currentSpeed < this.config.MAX_SPEED) {
+          this.currentSpeed += this.config.ACCELERATION;
+        }
+      } else {
+        this.gameOver();
+      }
+
+      const playAchievementSound = this.distanceMeter.update(deltaTime,
+          Math.ceil(this.distanceRan));
+
+      if (!Runner.audioCues && playAchievementSound) {
+        this.playSound(this.soundFx.SCORE);
+      }
+
+      // Night mode.
+      if (!Runner.isAltGameModeEnabled()) {
+        if (this.invertTimer > this.config.INVERT_FADE_DURATION) {
+          this.invertTimer = 0;
+          this.invertTrigger = false;
+          this.invert(false);
+        } else if (this.invertTimer) {
+          this.invertTimer += deltaTime;
+        } else {
+          const actualDistance =
+              this.distanceMeter.getActualDistance(Math.ceil(this.distanceRan));
+
+          if (actualDistance > 0) {
+            this.invertTrigger =
+                !(actualDistance % this.config.INVERT_DISTANCE);
+
+            if (this.invertTrigger && this.invertTimer === 0) {
+              this.invertTimer += deltaTime;
+              this.invert(false);
+            }
+          }
+        }
+      }
+    }
+
+    if (this.playing || (!this.activated &&
+        this.tRex.blinkCount < Runner.config.MAX_BLINK_COUNT)) {
+      this.tRex.update(deltaTime);
+      this.scheduleNextUpdate();
+    }
+  },
+
+  /**
+   * Event handler.
+   * @param {Event} e
+   */
+  handleEvent(e) {
+    return (function(evtType, events) {
+      switch (evtType) {
+        case events.KEYDOWN:
+        case events.TOUCHSTART:
+        case events.POINTERDOWN:
+          this.onKeyDown(e);
+          break;
+        case events.KEYUP:
+        case events.TOUCHEND:
+        case events.POINTERUP:
+          this.onKeyUp(e);
+          break;
+        case events.GAMEPADCONNECTED:
+          this.onGamepadConnected(e);
+          break;
+      }
+    }.bind(this))(e.type, Runner.events);
+  },
+
+  /**
+   * Initialize audio cues if activated by focus on the canvas element.
+   * @param {Event} e
+   */
+  handleCanvasKeyPress(e) {
+    if (!this.activated && !Runner.audioCues) {
+      this.toggleSpeed();
+      Runner.audioCues = true;
+      this.generatedSoundFx.init();
+      Runner.generatedSoundFx = this.generatedSoundFx;
+      Runner.config.CLEAR_TIME *= 1.2;
+    } else if (e.keyCode && Runner.keycodes.JUMP[e.keyCode]) {
+      this.onKeyDown(e);
+    }
+  },
+
+  /**
+   * Prevent space key press from scrolling.
+   * @param {Event} e
+   */
+  preventScrolling(e) {
+    if (e.keyCode === 32) {
+      e.preventDefault();
+    }
+  },
+
+  /**
+   * Toggle speed setting if toggle is shown.
+   */
+  toggleSpeed() {
+    if (Runner.audioCues) {
+      const speedChange = Runner.slowDown != this.slowSpeedCheckbox.checked;
+
+      if (speedChange) {
+        Runner.slowDown = this.slowSpeedCheckbox.checked;
+        const updatedConfig =
+            Runner.slowDown ? Runner.slowConfig : Runner.normalConfig;
+
+        Runner.config = Object.assign(Runner.config, updatedConfig);
+        this.currentSpeed = updatedConfig.SPEED;
+        this.tRex.enableSlowConfig();
+        this.horizon.adjustObstacleSpeed();
+      }
+      if (this.playing) {
+        this.disableSpeedToggle(true);
+      }
+    }
+  },
+
+  /**
+   * Show the speed toggle.
+   * From focus event or when audio cues are activated.
+   * @param {Event=} e
+   */
+  showSpeedToggle(e) {
+    const isFocusEvent = e && e.type == 'focus';
+    if (Runner.audioCues || isFocusEvent) {
+      this.slowSpeedCheckboxLabel.classList.toggle(
+          HIDDEN_CLASS, isFocusEvent ? false : !this.crashed);
+    }
+  },
+
+  /**
+   * Disable the speed toggle.
+   * @param {boolean} disable
+   */
+  disableSpeedToggle(disable) {
+    if (disable) {
+      this.slowSpeedCheckbox.setAttribute('disabled', 'disabled');
+    } else {
+      this.slowSpeedCheckbox.removeAttribute('disabled');
+    }
+  },
+
+  /**
+   * Bind relevant key / mouse / touch listeners.
+   */
+  startListening() {
+    // A11y keyboard / screen reader activation.
+    this.containerEl.addEventListener(
+        Runner.events.KEYDOWN, this.handleCanvasKeyPress.bind(this));
+    if (!IS_MOBILE) {
+      this.containerEl.addEventListener(
+          Runner.events.FOCUS, this.showSpeedToggle.bind(this));
+    }
+    this.canvas.addEventListener(
+        Runner.events.KEYDOWN, this.preventScrolling.bind(this));
+    this.canvas.addEventListener(
+        Runner.events.KEYUP, this.preventScrolling.bind(this));
+
+    // Keys.
+    document.addEventListener(Runner.events.KEYDOWN, this);
+    document.addEventListener(Runner.events.KEYUP, this);
+
+    // Touch / pointer.
+    this.containerEl.addEventListener(Runner.events.TOUCHSTART, this);
+    document.addEventListener(Runner.events.POINTERDOWN, this);
+    document.addEventListener(Runner.events.POINTERUP, this);
+
+    if (this.isArcadeMode()) {
+      // Gamepad
+      window.addEventListener(Runner.events.GAMEPADCONNECTED, this);
+    }
+  },
+
+  /**
+   * Remove all listeners.
+   */
+  stopListening() {
+    document.removeEventListener(Runner.events.KEYDOWN, this);
+    document.removeEventListener(Runner.events.KEYUP, this);
+
+    if (this.touchController) {
+      this.touchController.removeEventListener(Runner.events.TOUCHSTART, this);
+      this.touchController.removeEventListener(Runner.events.TOUCHEND, this);
+    }
+
+    this.containerEl.removeEventListener(Runner.events.TOUCHSTART, this);
+    document.removeEventListener(Runner.events.POINTERDOWN, this);
+    document.removeEventListener(Runner.events.POINTERUP, this);
+
+    if (this.isArcadeMode()) {
+      window.removeEventListener(Runner.events.GAMEPADCONNECTED, this);
+    }
+  },
+
+  /**
+   * Process keydown.
+   * @param {Event} e
+   */
+  onKeyDown(e) {
+    // Prevent native page scrolling whilst tapping on mobile.
+    if (IS_MOBILE && this.playing) {
+      e.preventDefault();
+    }
+
+    if (this.isCanvasInView()) {
+      // Allow toggling of speed toggle.
+      if (Runner.keycodes.JUMP[e.keyCode] &&
+          e.target == this.slowSpeedCheckbox) {
+        return;
+      }
+
+      if (!this.crashed && !this.paused) {
+        // For a11y, screen reader activation.
+        const isMobileMouseInput = IS_MOBILE &&
+            e.type === Runner.events.POINTERDOWN && e.pointerType == 'mouse' &&
+            (e.target == this.containerEl ||
+             (IS_IOS &&
+              (e.target == this.touchController || e.target == this.canvas)));
+
+        if (Runner.keycodes.JUMP[e.keyCode] ||
+            e.type === Runner.events.TOUCHSTART || isMobileMouseInput) {
+          e.preventDefault();
+          // Starting the game for the first time.
+          if (!this.playing) {
+            // Started by touch so create a touch controller.
+            if (!this.touchController && e.type === Runner.events.TOUCHSTART) {
+              this.createTouchController();
+            }
+
+            if (isMobileMouseInput) {
+              this.handleCanvasKeyPress(e);
+            }
+            this.loadSounds();
+            this.setPlayStatus(true);
+            this.update();
+            if (window.errorPageController) {
+              errorPageController.trackEasterEgg();
+            }
+          }
+          // Start jump.
+          if (!this.tRex.jumping && !this.tRex.ducking) {
+            if (Runner.audioCues) {
+              this.generatedSoundFx.cancelFootSteps();
+            } else {
+              this.playSound(this.soundFx.BUTTON_PRESS);
+            }
+            this.tRex.startJump(this.currentSpeed);
+          }
+        } else if (this.playing && Runner.keycodes.DUCK[e.keyCode]) {
+          e.preventDefault();
+          if (this.tRex.jumping) {
+            // Speed drop, activated only when jump key is not pressed.
+            this.tRex.setSpeedDrop();
+          } else if (!this.tRex.jumping && !this.tRex.ducking) {
+            // Duck.
+            this.tRex.setDuck(true);
+          }
+        }
+      }
+    }
+  },
+
+  /**
+   * Process key up.
+   * @param {Event} e
+   */
+  onKeyUp(e) {
+    const keyCode = String(e.keyCode);
+    const isjumpKey = Runner.keycodes.JUMP[keyCode] ||
+        e.type === Runner.events.TOUCHEND || e.type === Runner.events.POINTERUP;
+
+    if (this.isRunning() && isjumpKey) {
+      this.tRex.endJump();
+    } else if (Runner.keycodes.DUCK[keyCode]) {
+      this.tRex.speedDrop = false;
+      this.tRex.setDuck(false);
+    } else if (this.crashed) {
+      // Check that enough time has elapsed before allowing jump key to restart.
+      const deltaTime = getTimeStamp() - this.time;
+
+      if (this.isCanvasInView() &&
+          (Runner.keycodes.RESTART[keyCode] || this.isLeftClickOnCanvas(e) ||
+          (deltaTime >= this.config.GAMEOVER_CLEAR_TIME &&
+          Runner.keycodes.JUMP[keyCode]))) {
+        this.handleGameOverClicks(e);
+      }
+    } else if (this.paused && isjumpKey) {
+      // Reset the jump state
+      this.tRex.reset();
+      this.play();
+    }
+  },
+
+  /**
+   * Process gamepad connected event.
+   * @param {Event} e
+   */
+  onGamepadConnected(e) {
+    if (!this.pollingGamepads) {
+      this.pollGamepadState();
+    }
+  },
+
+  /**
+   * rAF loop for gamepad polling.
+   */
+  pollGamepadState() {
+    const gamepads = navigator.getGamepads();
+    this.pollActiveGamepad(gamepads);
+
+    this.pollingGamepads = true;
+    requestAnimationFrame(this.pollGamepadState.bind(this));
+  },
+
+  /**
+   * Polls for a gamepad with the jump button pressed. If one is found this
+   * becomes the "active" gamepad and all others are ignored.
+   * @param {!Array<Gamepad>} gamepads
+   */
+  pollForActiveGamepad(gamepads) {
+    for (let i = 0; i < gamepads.length; ++i) {
+      if (gamepads[i] && gamepads[i].buttons.length > 0 &&
+          gamepads[i].buttons[0].pressed) {
+        this.gamepadIndex = i;
+        this.pollActiveGamepad(gamepads);
+        return;
+      }
+    }
+  },
+
+  /**
+   * Polls the chosen gamepad for button presses and generates KeyboardEvents
+   * to integrate with the rest of the game logic.
+   * @param {!Array<Gamepad>} gamepads
+   */
+  pollActiveGamepad(gamepads) {
+    if (this.gamepadIndex === undefined) {
+      this.pollForActiveGamepad(gamepads);
+      return;
+    }
+
+    const gamepad = gamepads[this.gamepadIndex];
+    if (!gamepad) {
+      this.gamepadIndex = undefined;
+      this.pollForActiveGamepad(gamepads);
+      return;
+    }
+
+    // The gamepad specification defines the typical mapping of physical buttons
+    // to button indicies: https://w3c.github.io/gamepad/#remapping
+    this.pollGamepadButton(gamepad, 0, 38);  // Jump
+    if (gamepad.buttons.length >= 2) {
+      this.pollGamepadButton(gamepad, 1, 40);  // Duck
+    }
+    if (gamepad.buttons.length >= 10) {
+      this.pollGamepadButton(gamepad, 9, 13);  // Restart
+    }
+
+    this.previousGamepad = gamepad;
+  },
+
+  /**
+   * Generates a key event based on a gamepad button.
+   * @param {!Gamepad} gamepad
+   * @param {number} buttonIndex
+   * @param {number} keyCode
+   */
+  pollGamepadButton(gamepad, buttonIndex, keyCode) {
+    const state = gamepad.buttons[buttonIndex].pressed;
+    let previousState = false;
+    if (this.previousGamepad) {
+      previousState = this.previousGamepad.buttons[buttonIndex].pressed;
+    }
+    // Generate key events on the rising and falling edge of a button press.
+    if (state !== previousState) {
+      const e = new KeyboardEvent(state ? Runner.events.KEYDOWN
+                                      : Runner.events.KEYUP,
+                                { keyCode: keyCode });
+      document.dispatchEvent(e);
+    }
+  },
+
+  /**
+   * Handle interactions on the game over screen state.
+   * A user is able to tap the high score twice to reset it.
+   * @param {Event} e
+   */
+  handleGameOverClicks(e) {
+    if (e.target != this.slowSpeedCheckbox) {
+      e.preventDefault();
+      if (this.distanceMeter.hasClickedOnHighScore(e) && this.highestScore) {
+        if (this.distanceMeter.isHighScoreFlashing()) {
+          // Subsequent click, reset the high score.
+          this.saveHighScore(0, true);
+          this.distanceMeter.resetHighScore();
+        } else {
+          // First click, flash the high score.
+          this.distanceMeter.startHighScoreFlashing();
+        }
+      } else {
+        this.distanceMeter.cancelHighScoreFlashing();
+        this.restart();
+      }
+    }
+  },
+
+  /**
+   * Returns whether the event was a left click on canvas.
+   * On Windows right click is registered as a click.
+   * @param {Event} e
+   * @return {boolean}
+   */
+  isLeftClickOnCanvas(e) {
+    return e.button != null && e.button < 2 &&
+        e.type === Runner.events.POINTERUP &&
+        (e.target === this.canvas ||
+         (IS_MOBILE && Runner.audioCues && e.target === this.containerEl));
+  },
+
+  /**
+   * RequestAnimationFrame wrapper.
+   */
+  scheduleNextUpdate() {
+    if (!this.updatePending) {
+      this.updatePending = true;
+      this.raqId = requestAnimationFrame(this.update.bind(this));
+    }
+  },
+
+  /**
+   * Whether the game is running.
+   * @return {boolean}
+   */
+  isRunning() {
+    return !!this.raqId;
+  },
+
+  /**
+   * Set the initial high score as stored in the user's profile.
+   * @param {number} highScore
+   */
+  initializeHighScore(highScore) {
+    this.syncHighestScore = true;
+    highScore = Math.ceil(highScore);
+    if (highScore < this.highestScore) {
+      if (window.errorPageController) {
+        errorPageController.updateEasterEggHighScore(this.highestScore);
+      }
+      return;
+    }
+    this.highestScore = highScore;
+    this.distanceMeter.setHighScore(this.highestScore);
+  },
+
+  /**
+   * Sets the current high score and saves to the profile if available.
+   * @param {number} distanceRan Total distance ran.
+   * @param {boolean=} opt_resetScore Whether to reset the score.
+   */
+  saveHighScore(distanceRan, opt_resetScore) {
+    this.highestScore = Math.ceil(distanceRan);
+    this.distanceMeter.setHighScore(this.highestScore);
+
+    // Store the new high score in the profile.
+    if (this.syncHighestScore && window.errorPageController) {
+      if (opt_resetScore) {
+        errorPageController.resetEasterEggHighScore();
+      } else {
+        errorPageController.updateEasterEggHighScore(this.highestScore);
+      }
+    }
+  },
+
+  /**
+   * Game over state.
+   */
+  gameOver() {
+    this.playSound(this.soundFx.HIT);
+    vibrate(200);
+
+    this.stop();
+    this.crashed = true;
+    this.distanceMeter.achievement = false;
+
+    this.tRex.update(100, Trex.status.CRASHED);
+
+    // Game over panel.
+    if (!this.gameOverPanel) {
+      const origSpriteDef = IS_HIDPI ? spriteDefinitionByType.original.HDPI :
+                                       spriteDefinitionByType.original.LDPI;
+
+      if (this.canvas) {
+        if (Runner.isAltGameModeEnabled) {
+          this.gameOverPanel = new GameOverPanel(
+              this.canvas, origSpriteDef.TEXT_SPRITE, origSpriteDef.RESTART,
+              this.dimensions, origSpriteDef.ALT_GAME_END,
+              this.altGameModeActive);
+        } else {
+          this.gameOverPanel = new GameOverPanel(
+              this.canvas, origSpriteDef.TEXT_SPRITE, origSpriteDef.RESTART,
+              this.dimensions);
+        }
+      }
+    }
+
+    this.gameOverPanel.draw(this.altGameModeActive, this.tRex);
+
+    // Update the high score.
+    if (this.distanceRan > this.highestScore) {
+      this.saveHighScore(this.distanceRan);
+    }
+
+    // Reset the time clock.
+    this.time = getTimeStamp();
+
+    if (Runner.audioCues) {
+      this.generatedSoundFx.stopAll();
+      announcePhrase(
+          getA11yString(A11Y_STRINGS.gameOver)
+              .replace(
+                  '$1',
+                  this.distanceMeter.getActualDistance(this.distanceRan)
+                      .toString()) +
+          ' ' +
+          getA11yString(A11Y_STRINGS.highScore)
+              .replace(
+                  '$1',
+
+                  this.distanceMeter.getActualDistance(this.highestScore)
+                      .toString()));
+      this.containerEl.setAttribute(
+          'title', getA11yString(A11Y_STRINGS.ariaLabel));
+    }
+    this.showSpeedToggle();
+    this.disableSpeedToggle(false);
+  },
+
+  stop() {
+    this.setPlayStatus(false);
+    this.paused = true;
+    cancelAnimationFrame(this.raqId);
+    this.raqId = 0;
+    this.generatedSoundFx.stopAll();
+  },
+
+  play() {
+    if (!this.crashed) {
+      this.setPlayStatus(true);
+      this.paused = false;
+      this.tRex.update(0, Trex.status.RUNNING);
+      this.time = getTimeStamp();
+      this.update();
+      this.generatedSoundFx.background();
+    }
+  },
+
+  restart() {
+    if (!this.raqId) {
+      this.playCount++;
+      this.runningTime = 0;
+      this.setPlayStatus(true);
+      this.toggleSpeed();
+      this.paused = false;
+      this.crashed = false;
+      this.distanceRan = 0;
+      this.setSpeed(this.config.SPEED);
+      this.time = getTimeStamp();
+      this.containerEl.classList.remove(Runner.classes.CRASHED);
+      this.clearCanvas();
+      this.distanceMeter.reset();
+      this.horizon.reset();
+      this.tRex.reset();
+      this.playSound(this.soundFx.BUTTON_PRESS);
+      this.invert(true);
+      this.flashTimer = null;
+      this.update();
+      this.gameOverPanel.reset();
+      this.generatedSoundFx.background();
+      this.containerEl.setAttribute('title', getA11yString(A11Y_STRINGS.jump));
+      announcePhrase(getA11yString(A11Y_STRINGS.started));
+    }
+  },
+
+  setPlayStatus(isPlaying) {
+    if (this.touchController) {
+      this.touchController.classList.toggle(HIDDEN_CLASS, !isPlaying);
+    }
+    this.playing = isPlaying;
+  },
+
+  /**
+   * Whether the game should go into arcade mode.
+   * @return {boolean}
+   */
+  isArcadeMode() {
+    // In RTL languages the title is wrapped with the left to right mark
+    // control characters &#x202A; and &#x202C but are invisible.
+    return IS_RTL ? document.title.indexOf(ARCADE_MODE_URL) == 1 :
+                    document.title === ARCADE_MODE_URL;
+  },
+
+  /**
+   * Hides offline messaging for a fullscreen game only experience.
+   */
+  setArcadeMode() {
+    document.body.classList.add(Runner.classes.ARCADE_MODE);
+    this.setArcadeModeContainerScale();
+  },
+
+  /**
+   * Sets the scaling for arcade mode.
+   */
+  setArcadeModeContainerScale() {
+    const windowHeight = window.innerHeight;
+    const scaleHeight = windowHeight / this.dimensions.HEIGHT;
+    const scaleWidth = window.innerWidth / this.dimensions.WIDTH;
+    const scale = Math.max(1, Math.min(scaleHeight, scaleWidth));
+    const scaledCanvasHeight = this.dimensions.HEIGHT * scale;
+    // Positions the game container at 10% of the available vertical window
+    // height minus the game container height.
+    const translateY = Math.ceil(Math.max(0, (windowHeight - scaledCanvasHeight -
+        Runner.config.ARCADE_MODE_INITIAL_TOP_POSITION) *
+        Runner.config.ARCADE_MODE_TOP_POSITION_PERCENT)) *
+        window.devicePixelRatio;
+
+    const cssScale = IS_RTL ? -scale + ',' + scale : scale;
+    this.containerEl.style.transform =
+        'scale(' + cssScale + ') translateY(' + translateY + 'px)';
+  },
+
+  /**
+   * Pause the game if the tab is not in focus.
+   */
+  onVisibilityChange(e) {
+    if (document.hidden || document.webkitHidden || e.type === 'blur' ||
+        document.visibilityState !== 'visible') {
+      this.stop();
+    } else if (!this.crashed) {
+      this.tRex.reset();
+      this.play();
+    }
+  },
+
+  /**
+   * Play a sound.
+   * @param {AudioBuffer} soundBuffer
+   */
+  playSound(soundBuffer) {
+    if (soundBuffer) {
+      const sourceNode = this.audioContext.createBufferSource();
+      sourceNode.buffer = soundBuffer;
+      sourceNode.connect(this.audioContext.destination);
+      sourceNode.start(0);
+    }
+  },
+
+  /**
+   * Inverts the current page / canvas colors.
+   * @param {boolean} reset Whether to reset colors.
+   */
+  invert(reset) {
+    const htmlEl = document.firstElementChild;
+
+    if (reset) {
+      htmlEl.classList.toggle(Runner.classes.INVERTED,
+          false);
+      this.invertTimer = 0;
+      this.inverted = false;
+    } else {
+      this.inverted = htmlEl.classList.toggle(
+          Runner.classes.INVERTED, this.invertTrigger);
+    }
+  },
+};
+
+
+/**
+ * Updates the canvas size taking into
+ * account the backing store pixel ratio and
+ * the device pixel ratio.
+ *
+ * See article by Paul Lewis:
+ * http://www.html5rocks.com/en/tutorials/canvas/hidpi/
+ *
+ * @param {HTMLCanvasElement} canvas
+ * @param {number=} opt_width
+ * @param {number=} opt_height
+ * @return {boolean} Whether the canvas was scaled.
+ */
+Runner.updateCanvasScaling = function(canvas, opt_width, opt_height) {
+  const context =
+      /** @type {CanvasRenderingContext2D} */ (canvas.getContext('2d'));
+
+  // Query the various pixel ratios
+  const devicePixelRatio = Math.floor(window.devicePixelRatio) || 1;
+  /** @suppress {missingProperties} */
+  const backingStoreRatio =
+      Math.floor(context.webkitBackingStorePixelRatio) || 1;
+  const ratio = devicePixelRatio / backingStoreRatio;
+
+  // Upscale the canvas if the two ratios don't match
+  if (devicePixelRatio !== backingStoreRatio) {
+    const oldWidth = opt_width || canvas.width;
+    const oldHeight = opt_height || canvas.height;
+
+    canvas.width = oldWidth * ratio;
+    canvas.height = oldHeight * ratio;
+
+    canvas.style.width = oldWidth + 'px';
+    canvas.style.height = oldHeight + 'px';
+
+    // Scale the context to counter the fact that we've manually scaled
+    // our canvas element.
+    context.scale(ratio, ratio);
+    return true;
+  } else if (devicePixelRatio === 1) {
+    // Reset the canvas width / height. Fixes scaling bug when the page is
+    // zoomed and the devicePixelRatio changes accordingly.
+    canvas.style.width = canvas.width + 'px';
+    canvas.style.height = canvas.height + 'px';
+  }
+  return false;
+};
+
+
+/**
+ * Whether events are enabled.
+ * @return {boolean}
+ */
+Runner.isAltGameModeEnabled = function() {
+  return loadTimeData && loadTimeData.valueExists('enableAltGameMode');
+};
+
+
+/**
+ * Generated sound FX class for audio cues.
+ * @constructor
+ */
+function GeneratedSoundFx() {
+  this.audioCues = false;
+  this.context = null;
+  this.panner = null;
+}
+
+GeneratedSoundFx.prototype = {
+  init() {
+    this.audioCues = true;
+    if (!this.context) {
+      // iOS only supports the webkit version.
+      this.context = window.webkitAudioContext ? new webkitAudioContext() :
+                                                 new AudioContext();
+      if (IS_IOS) {
+        this.context.onstatechange = (function() {
+                                       if (this.context.state != 'running') {
+                                         this.context.resume();
+                                       }
+                                     }).bind(this);
+        this.context.resume();
+      }
+      this.panner = this.context.createStereoPanner ?
+          this.context.createStereoPanner() :
+          null;
+    }
+  },
+
+  stopAll() {
+    this.cancelFootSteps();
+  },
+
+  /**
+   * Play oscillators at certain frequency and for a certain time.
+   * @param {number} frequency
+   * @param {number} startTime
+   * @param {number} duration
+   * @param {?number=} opt_vol
+   * @param {number=} opt_pan
+   */
+  playNote(frequency, startTime, duration, opt_vol, opt_pan) {
+    const osc1 = this.context.createOscillator();
+    const osc2 = this.context.createOscillator();
+    const volume = this.context.createGain();
+
+    // Set oscillator wave type
+    osc1.type = 'triangle';
+    osc2.type = 'triangle';
+    volume.gain.value = 0.1;
+
+    // Set up node routing
+    if (this.panner) {
+      this.panner.pan.value = opt_pan || 0;
+      osc1.connect(volume).connect(this.panner);
+      osc2.connect(volume).connect(this.panner);
+      this.panner.connect(this.context.destination);
+    } else {
+      osc1.connect(volume);
+      osc2.connect(volume);
+      volume.connect(this.context.destination);
+    }
+
+    // Detune oscillators for chorus effect
+    osc1.frequency.value = frequency + 1;
+    osc2.frequency.value = frequency - 2;
+
+    // Fade out
+    volume.gain.setValueAtTime(opt_vol || 0.01, startTime + duration - 0.05);
+    volume.gain.linearRampToValueAtTime(0.00001, startTime + duration);
+
+    // Start oscillators
+    osc1.start(startTime);
+    osc2.start(startTime);
+    // Stop oscillators
+    osc1.stop(startTime + duration);
+    osc2.stop(startTime + duration);
+  },
+
+  background() {
+    if (this.audioCues) {
+      const now = this.context.currentTime;
+      this.playNote(493.883, now, 0.116);
+      this.playNote(659.255, now + 0.116, 0.232);
+      this.loopFootSteps();
+    }
+  },
+
+  loopFootSteps() {
+    if (this.audioCues && !this.bgSoundIntervalId) {
+      this.bgSoundIntervalId = setInterval(function() {
+        this.playNote(73.42, this.context.currentTime, 0.05, 0.16);
+        this.playNote(69.30, this.context.currentTime + 0.116, 0.116, 0.16);
+      }.bind(this), 280);
+    }
+  },
+
+  cancelFootSteps() {
+    if (this.audioCues && this.bgSoundIntervalId) {
+      clearInterval(this.bgSoundIntervalId);
+      this.bgSoundIntervalId = null;
+      this.playNote(103.83, this.context.currentTime, 0.232, 0.02);
+      this.playNote(116.54, this.context.currentTime + 0.116, 0.232, 0.02);
+    }
+  },
+
+  collect() {
+    if (this.audioCues) {
+      this.cancelFootSteps();
+      const now = this.context.currentTime;
+      this.playNote(830.61, now, 0.116);
+      this.playNote(1318.51, now + 0.116, 0.232);
+    }
+  },
+
+  jump() {
+    if (this.audioCues) {
+      const now = this.context.currentTime;
+      this.playNote(659.25, now, 0.116, 0.3, -0.6);
+      this.playNote(880, now + 0.116, 0.232, 0.3, -0.6);
+    }
+  },
+};
+
+
+/**
+ * For screen readers make an announcement to the live region.
+ * @param {string} phrase Sentence to speak.
+ */
+function announcePhrase(phrase) {
+  if (Runner.a11yStatusEl) {
+    Runner.a11yStatusEl.textContent = '';
+    Runner.a11yStatusEl.textContent = phrase;
+  }
+}
+
+
+/**
+ * Returns a string from loadTimeData data object.
+ * @param {string} stringName
+ * @return {string}
+ */
+function getA11yString(stringName) {
+  return loadTimeData && loadTimeData.valueExists(stringName) ?
+      loadTimeData.getString(stringName) :
+      '';
+}
+
+
+/**
+ * Get random number.
+ * @param {number} min
+ * @param {number} max
+ */
+function getRandomNum(min, max) {
+  return Math.floor(Math.random() * (max - min + 1)) + min;
+}
+
+
+/**
+ * Vibrate on mobile devices.
+ * @param {number} duration Duration of the vibration in milliseconds.
+ */
+function vibrate(duration) {
+  if (IS_MOBILE && window.navigator.vibrate) {
+    window.navigator.vibrate(duration);
+  }
+}
+
+
+/**
+ * Create canvas element.
+ * @param {Element} container Element to append canvas to.
+ * @param {number} width
+ * @param {number} height
+ * @param {string=} opt_classname
+ * @return {HTMLCanvasElement}
+ */
+function createCanvas(container, width, height, opt_classname) {
+  const canvas =
+      /** @type {!HTMLCanvasElement} */ (document.createElement('canvas'));
+  canvas.className = opt_classname ? Runner.classes.CANVAS + ' ' +
+      opt_classname : Runner.classes.CANVAS;
+  canvas.width = width;
+  canvas.height = height;
+  container.appendChild(canvas);
+
+  return canvas;
+}
+
+
+/**
+ * Decodes the base 64 audio to ArrayBuffer used by Web Audio.
+ * @param {string} base64String
+ */
+function decodeBase64ToArrayBuffer(base64String) {
+  const len = (base64String.length / 4) * 3;
+  const str = atob(base64String);
+  const arrayBuffer = new ArrayBuffer(len);
+  const bytes = new Uint8Array(arrayBuffer);
+
+  for (let i = 0; i < len; i++) {
+    bytes[i] = str.charCodeAt(i);
+  }
+  return bytes.buffer;
+}
+
+
+/**
+ * Return the current timestamp.
+ * @return {number}
+ */
+function getTimeStamp() {
+  return IS_IOS ? new Date().getTime() : performance.now();
+}
+
+
+//******************************************************************************
+
+
+/**
+ * Game over panel.
+ * @param {!HTMLCanvasElement} canvas
+ * @param {Object} textImgPos
+ * @param {Object} restartImgPos
+ * @param {!Object} dimensions Canvas dimensions.
+ * @param {Object=} opt_altGameEndImgPos
+ * @param {boolean=} opt_altGameActive
+ * @constructor
+ */
+function GameOverPanel(
+    canvas, textImgPos, restartImgPos, dimensions, opt_altGameEndImgPos,
+    opt_altGameActive) {
+  this.canvas = canvas;
+  this.canvasCtx =
+      /** @type {CanvasRenderingContext2D} */ (canvas.getContext('2d'));
+  this.canvasDimensions = dimensions;
+  this.textImgPos = textImgPos;
+  this.restartImgPos = restartImgPos;
+  this.altGameEndImgPos = opt_altGameEndImgPos;
+  this.altGameModeActive = opt_altGameActive;
+
+  // Retry animation.
+  this.frameTimeStamp = 0;
+  this.animTimer = 0;
+  this.currentFrame = 0;
+
+  this.gameOverRafId = null;
+
+  this.flashTimer = 0;
+  this.flashCounter = 0;
+  this.originalText = true;
+}
+
+GameOverPanel.RESTART_ANIM_DURATION = 875;
+GameOverPanel.LOGO_PAUSE_DURATION = 875;
+GameOverPanel.FLASH_ITERATIONS = 5;
+
+/**
+ * Animation frames spec.
+ */
+GameOverPanel.animConfig = {
+  frames: [0, 36, 72, 108, 144, 180, 216, 252],
+  msPerFrame: GameOverPanel.RESTART_ANIM_DURATION / 8,
+};
+
+/**
+ * Dimensions used in the panel.
+ * @enum {number}
+ */
+GameOverPanel.dimensions = {
+  TEXT_X: 0,
+  TEXT_Y: 13,
+  TEXT_WIDTH: 191,
+  TEXT_HEIGHT: 11,
+  RESTART_WIDTH: 36,
+  RESTART_HEIGHT: 32,
+};
+
+
+GameOverPanel.prototype = {
+  /**
+   * Update the panel dimensions.
+   * @param {number} width New canvas width.
+   * @param {number} opt_height Optional new canvas height.
+   */
+  updateDimensions(width, opt_height) {
+    this.canvasDimensions.WIDTH = width;
+    if (opt_height) {
+      this.canvasDimensions.HEIGHT = opt_height;
+    }
+    this.currentFrame = GameOverPanel.animConfig.frames.length - 1;
+  },
+
+  drawGameOverText(dimensions, opt_useAltText) {
+    const centerX = this.canvasDimensions.WIDTH / 2;
+    let textSourceX = dimensions.TEXT_X;
+    let textSourceY = dimensions.TEXT_Y;
+    let textSourceWidth = dimensions.TEXT_WIDTH;
+    let textSourceHeight = dimensions.TEXT_HEIGHT;
+
+    const textTargetX = Math.round(centerX - (dimensions.TEXT_WIDTH / 2));
+    const textTargetY = Math.round((this.canvasDimensions.HEIGHT - 25) / 3);
+    const textTargetWidth = dimensions.TEXT_WIDTH;
+    const textTargetHeight = dimensions.TEXT_HEIGHT;
+
+    if (IS_HIDPI) {
+      textSourceY *= 2;
+      textSourceX *= 2;
+      textSourceWidth *= 2;
+      textSourceHeight *= 2;
+    }
+
+    if (!opt_useAltText) {
+      textSourceX += this.textImgPos.x;
+      textSourceY += this.textImgPos.y;
+    }
+
+    const spriteSource =
+        opt_useAltText ? Runner.altCommonImageSprite : Runner.origImageSprite;
+
+    this.canvasCtx.save();
+
+    if (IS_RTL) {
+      this.canvasCtx.translate(this.canvasDimensions.WIDTH, 0);
+      this.canvasCtx.scale(-1, 1);
+    }
+
+    // Game over text from sprite.
+    this.canvasCtx.drawImage(
+        spriteSource, textSourceX, textSourceY, textSourceWidth,
+        textSourceHeight, textTargetX, textTargetY, textTargetWidth,
+        textTargetHeight);
+
+    this.canvasCtx.restore();
+  },
+
+  /**
+   * Draw additional adornments for alternative game types.
+   */
+  drawAltGameElements(tRex) {
+    // Additional adornments.
+    if (this.altGameModeActive && Runner.spriteDefinition.ALT_GAME_END_CONFIG) {
+      const altGameEndConfig = Runner.spriteDefinition.ALT_GAME_END_CONFIG;
+
+      let altGameEndSourceWidth = altGameEndConfig.WIDTH;
+      let altGameEndSourceHeight = altGameEndConfig.HEIGHT;
+      const altGameEndTargetX = tRex.xPos + altGameEndConfig.X_OFFSET;
+      const altGameEndTargetY = tRex.yPos + altGameEndConfig.Y_OFFSET;
+
+      if (IS_HIDPI) {
+        altGameEndSourceWidth *= 2;
+        altGameEndSourceHeight *= 2;
+      }
+
+      this.canvasCtx.drawImage(
+          Runner.altCommonImageSprite, this.altGameEndImgPos.x,
+          this.altGameEndImgPos.y, altGameEndSourceWidth,
+          altGameEndSourceHeight, altGameEndTargetX, altGameEndTargetY,
+          altGameEndConfig.WIDTH, altGameEndConfig.HEIGHT);
+    }
+  },
+
+  /**
+   * Draw restart button.
+   */
+  drawRestartButton() {
+    const dimensions = GameOverPanel.dimensions;
+    let framePosX = GameOverPanel.animConfig.frames[this.currentFrame];
+    let restartSourceWidth = dimensions.RESTART_WIDTH;
+    let restartSourceHeight = dimensions.RESTART_HEIGHT;
+    const restartTargetX =
+        (this.canvasDimensions.WIDTH / 2) - (dimensions.RESTART_WIDTH / 2);
+    const restartTargetY = this.canvasDimensions.HEIGHT / 2;
+
+    if (IS_HIDPI) {
+      restartSourceWidth *= 2;
+      restartSourceHeight *= 2;
+      framePosX *= 2;
+    }
+
+    this.canvasCtx.save();
+
+    if (IS_RTL) {
+      this.canvasCtx.translate(this.canvasDimensions.WIDTH, 0);
+      this.canvasCtx.scale(-1, 1);
+    }
+
+    this.canvasCtx.drawImage(
+        Runner.origImageSprite, this.restartImgPos.x + framePosX,
+        this.restartImgPos.y, restartSourceWidth, restartSourceHeight,
+        restartTargetX, restartTargetY, dimensions.RESTART_WIDTH,
+        dimensions.RESTART_HEIGHT);
+    this.canvasCtx.restore();
+  },
+
+
+  /**
+   * Draw the panel.
+   * @param {boolean} opt_altGameModeActive
+   * @param {!Trex} opt_tRex
+   */
+  draw(opt_altGameModeActive, opt_tRex) {
+    if (opt_altGameModeActive) {
+      this.altGameModeActive = opt_altGameModeActive;
+    }
+
+    this.drawGameOverText(GameOverPanel.dimensions, false);
+    this.drawRestartButton();
+    this.drawAltGameElements(opt_tRex);
+    this.update();
+  },
+
+  /**
+   * Update animation frames.
+   */
+  update() {
+    const now = getTimeStamp();
+    const deltaTime = now - (this.frameTimeStamp || now);
+
+    this.frameTimeStamp = now;
+    this.animTimer += deltaTime;
+    this.flashTimer += deltaTime;
+
+    // Restart Button
+    if (this.currentFrame == 0 &&
+        this.animTimer > GameOverPanel.LOGO_PAUSE_DURATION) {
+      this.animTimer = 0;
+      this.currentFrame++;
+      this.drawRestartButton();
+    } else if (
+        this.currentFrame > 0 &&
+        this.currentFrame < GameOverPanel.animConfig.frames.length) {
+      if (this.animTimer >= GameOverPanel.animConfig.msPerFrame) {
+        this.currentFrame++;
+        this.drawRestartButton();
+      }
+    } else if (
+        !this.altGameModeActive &&
+        this.currentFrame == GameOverPanel.animConfig.frames.length) {
+      this.reset();
+      return;
+    }
+
+    // Game over text
+    if (this.altGameModeActive &&
+        spriteDefinitionByType.original.ALT_GAME_OVER_TEXT_CONFIG) {
+      const altTextConfig =
+          spriteDefinitionByType.original.ALT_GAME_OVER_TEXT_CONFIG;
+
+      if (altTextConfig.FLASHING) {
+        if (this.flashCounter < GameOverPanel.FLASH_ITERATIONS &&
+            this.flashTimer > altTextConfig.FLASH_DURATION) {
+          this.flashTimer = 0;
+          this.originalText = !this.originalText;
+
+          this.clearGameOverTextBounds();
+          if (this.originalText) {
+            this.drawGameOverText(GameOverPanel.dimensions, false);
+            this.flashCounter++;
+          } else {
+            this.drawGameOverText(altTextConfig, true);
+          }
+        } else if (this.flashCounter >= GameOverPanel.FLASH_ITERATIONS) {
+          this.reset();
+          return;
+        }
+      } else {
+        this.clearGameOverTextBounds(altTextConfig);
+        this.drawGameOverText(altTextConfig, true);
+      }
+    }
+
+    this.gameOverRafId = requestAnimationFrame(this.update.bind(this));
+  },
+
+  /**
+   * Clear game over text.
+   * @param {Object} dimensions Game over text config.
+   */
+  clearGameOverTextBounds(dimensions) {
+    this.canvasCtx.save();
+
+    this.canvasCtx.clearRect(
+        Math.round(
+            this.canvasDimensions.WIDTH / 2 - (dimensions.TEXT_WIDTH / 2)),
+        Math.round((this.canvasDimensions.HEIGHT - 25) / 3),
+        dimensions.TEXT_WIDTH, dimensions.TEXT_HEIGHT + 4);
+    this.canvasCtx.restore();
+  },
+
+  reset() {
+    if (this.gameOverRafId) {
+      cancelAnimationFrame(this.gameOverRafId);
+      this.gameOverRafId = null;
+    }
+    this.animTimer = 0;
+    this.frameTimeStamp = 0;
+    this.currentFrame = 0;
+    this.flashTimer = 0;
+    this.flashCounter = 0;
+    this.originalText = true;
+  },
+};
+
+
+//******************************************************************************
+
+/**
+ * Check for a collision.
+ * @param {!Obstacle} obstacle
+ * @param {!Trex} tRex T-rex object.
+ * @param {CanvasRenderingContext2D=} opt_canvasCtx Optional canvas context for
+ *    drawing collision boxes.
+ * @return {Array<CollisionBox>|undefined}
+ */
+function checkForCollision(obstacle, tRex, opt_canvasCtx) {
+  Runner.defaultDimensions.WIDTH + obstacle.xPos;
+
+  // Adjustments are made to the bounding box as there is a 1 pixel white
+  // border around the t-rex and obstacles.
+  const tRexBox = new CollisionBox(
+      tRex.xPos + 1,
+      tRex.yPos + 1,
+      tRex.config.WIDTH - 2,
+      tRex.config.HEIGHT - 2);
+
+  const obstacleBox = new CollisionBox(
+      obstacle.xPos + 1,
+      obstacle.yPos + 1,
+      obstacle.typeConfig.width * obstacle.size - 2,
+      obstacle.typeConfig.height - 2);
+
+  // Debug outer box
+  if (opt_canvasCtx) {
+    drawCollisionBoxes(opt_canvasCtx, tRexBox, obstacleBox);
+  }
+
+  // Simple outer bounds check.
+  if (boxCompare(tRexBox, obstacleBox)) {
+    const collisionBoxes = obstacle.collisionBoxes;
+    let tRexCollisionBoxes = [];
+
+    if (Runner.isAltGameModeEnabled()) {
+      tRexCollisionBoxes = Runner.spriteDefinition.TREX.COLLISION_BOXES;
+    } else {
+      tRexCollisionBoxes = tRex.ducking ? Trex.collisionBoxes.DUCKING :
+                                          Trex.collisionBoxes.RUNNING;
+    }
+
+    // Detailed axis aligned box check.
+    for (let t = 0; t < tRexCollisionBoxes.length; t++) {
+      for (let i = 0; i < collisionBoxes.length; i++) {
+        // Adjust the box to actual positions.
+        const adjTrexBox =
+            createAdjustedCollisionBox(tRexCollisionBoxes[t], tRexBox);
+        const adjObstacleBox =
+            createAdjustedCollisionBox(collisionBoxes[i], obstacleBox);
+        const crashed = boxCompare(adjTrexBox, adjObstacleBox);
+
+        // Draw boxes for debug.
+        if (opt_canvasCtx) {
+          drawCollisionBoxes(opt_canvasCtx, adjTrexBox, adjObstacleBox);
+        }
+
+        if (crashed) {
+          return [adjTrexBox, adjObstacleBox];
+        }
+      }
+    }
+  }
+}
+
+
+/**
+ * Adjust the collision box.
+ * @param {!CollisionBox} box The original box.
+ * @param {!CollisionBox} adjustment Adjustment box.
+ * @return {CollisionBox} The adjusted collision box object.
+ */
+function createAdjustedCollisionBox(box, adjustment) {
+  return new CollisionBox(
+      box.x + adjustment.x,
+      box.y + adjustment.y,
+      box.width,
+      box.height);
+}
+
+
+/**
+ * Draw the collision boxes for debug.
+ */
+function drawCollisionBoxes(canvasCtx, tRexBox, obstacleBox) {
+  canvasCtx.save();
+  canvasCtx.strokeStyle = '#f00';
+  canvasCtx.strokeRect(tRexBox.x, tRexBox.y, tRexBox.width, tRexBox.height);
+
+  canvasCtx.strokeStyle = '#0f0';
+  canvasCtx.strokeRect(obstacleBox.x, obstacleBox.y,
+      obstacleBox.width, obstacleBox.height);
+  canvasCtx.restore();
+}
+
+
+/**
+ * Compare two collision boxes for a collision.
+ * @param {CollisionBox} tRexBox
+ * @param {CollisionBox} obstacleBox
+ * @return {boolean} Whether the boxes intersected.
+ */
+function boxCompare(tRexBox, obstacleBox) {
+  let crashed = false;
+  tRexBox.x;
+  tRexBox.y;
+
+  const obstacleBoxX = obstacleBox.x;
+  obstacleBox.y;
+
+  // Axis-Aligned Bounding Box method.
+  if (tRexBox.x < obstacleBoxX + obstacleBox.width &&
+      tRexBox.x + tRexBox.width > obstacleBoxX &&
+      tRexBox.y < obstacleBox.y + obstacleBox.height &&
+      tRexBox.height + tRexBox.y > obstacleBox.y) {
+    crashed = true;
+  }
+
+  return crashed;
+}
+
+
+//******************************************************************************
+
+/**
+ * Obstacle.
+ * @param {CanvasRenderingContext2D} canvasCtx
+ * @param {ObstacleType} type
+ * @param {Object} spriteImgPos Obstacle position in sprite.
+ * @param {Object} dimensions
+ * @param {number} gapCoefficient Mutipler in determining the gap.
+ * @param {number} speed
+ * @param {number=} opt_xOffset
+ * @param {boolean=} opt_isAltGameMode
+ * @constructor
+ */
+function Obstacle(
+    canvasCtx, type, spriteImgPos, dimensions, gapCoefficient, speed,
+    opt_xOffset, opt_isAltGameMode) {
+  this.canvasCtx = canvasCtx;
+  this.spritePos = spriteImgPos;
+  this.typeConfig = type;
+  this.gapCoefficient = Runner.slowDown ? gapCoefficient * 2 : gapCoefficient;
+  this.size = getRandomNum(1, Obstacle.MAX_OBSTACLE_LENGTH);
+  this.dimensions = dimensions;
+  this.remove = false;
+  this.xPos = dimensions.WIDTH + (opt_xOffset || 0);
+  this.yPos = 0;
+  this.width = 0;
+  this.collisionBoxes = [];
+  this.gap = 0;
+  this.speedOffset = 0;
+  this.altGameModeActive = opt_isAltGameMode;
+  this.imageSprite = this.typeConfig.type == 'COLLECTABLE' ?
+      Runner.altCommonImageSprite :
+      this.altGameModeActive ? Runner.altGameImageSprite : Runner.imageSprite;
+
+  // For animated obstacles.
+  this.currentFrame = 0;
+  this.timer = 0;
+
+  this.init(speed);
+}
+
+/**
+ * Coefficient for calculating the maximum gap.
+ */
+Obstacle.MAX_GAP_COEFFICIENT = 1.5;
+
+/**
+ * Maximum obstacle grouping count.
+ */
+Obstacle.MAX_OBSTACLE_LENGTH = 3;
+
+
+Obstacle.prototype = {
+  /**
+   * Initialise the DOM for the obstacle.
+   * @param {number} speed
+   */
+  init(speed) {
+    this.cloneCollisionBoxes();
+
+    // Only allow sizing if we're at the right speed.
+    if (this.size > 1 && this.typeConfig.multipleSpeed > speed) {
+      this.size = 1;
+    }
+
+    this.width = this.typeConfig.width * this.size;
+
+    // Check if obstacle can be positioned at various heights.
+    if (Array.isArray(this.typeConfig.yPos)) {
+      const yPosConfig =
+          IS_MOBILE ? this.typeConfig.yPosMobile : this.typeConfig.yPos;
+      this.yPos = yPosConfig[getRandomNum(0, yPosConfig.length - 1)];
+    } else {
+      this.yPos = this.typeConfig.yPos;
+    }
+
+    this.draw();
+
+    // Make collision box adjustments,
+    // Central box is adjusted to the size as one box.
+    //      ____        ______        ________
+    //    _|   |-|    _|     |-|    _|       |-|
+    //   | |<->| |   | |<--->| |   | |<----->| |
+    //   | | 1 | |   | |  2  | |   | |   3   | |
+    //   |_|___|_|   |_|_____|_|   |_|_______|_|
+    //
+    if (this.size > 1) {
+      this.collisionBoxes[1].width = this.width - this.collisionBoxes[0].width -
+          this.collisionBoxes[2].width;
+      this.collisionBoxes[2].x = this.width - this.collisionBoxes[2].width;
+    }
+
+    // For obstacles that go at a different speed from the horizon.
+    if (this.typeConfig.speedOffset) {
+      this.speedOffset = Math.random() > 0.5 ? this.typeConfig.speedOffset :
+                                               -this.typeConfig.speedOffset;
+    }
+
+    this.gap = this.getGap(this.gapCoefficient, speed);
+
+    // Increase gap for audio cues enabled.
+    if (Runner.audioCues) {
+      this.gap *= 2;
+    }
+  },
+
+  /**
+   * Draw and crop based on size.
+   */
+  draw() {
+    let sourceWidth = this.typeConfig.width;
+    let sourceHeight = this.typeConfig.height;
+
+    if (IS_HIDPI) {
+      sourceWidth = sourceWidth * 2;
+      sourceHeight = sourceHeight * 2;
+    }
+
+    // X position in sprite.
+    let sourceX =
+        (sourceWidth * this.size) * (0.5 * (this.size - 1)) + this.spritePos.x;
+
+    // Animation frames.
+    if (this.currentFrame > 0) {
+      sourceX += sourceWidth * this.currentFrame;
+    }
+
+    this.canvasCtx.drawImage(
+        this.imageSprite, sourceX, this.spritePos.y, sourceWidth * this.size,
+        sourceHeight, this.xPos, this.yPos, this.typeConfig.width * this.size,
+        this.typeConfig.height);
+  },
+
+  /**
+   * Obstacle frame update.
+   * @param {number} deltaTime
+   * @param {number} speed
+   */
+  update(deltaTime, speed) {
+    if (!this.remove) {
+      if (this.typeConfig.speedOffset) {
+        speed += this.speedOffset;
+      }
+      this.xPos -= Math.floor((speed * FPS / 1000) * deltaTime);
+
+      // Update frame
+      if (this.typeConfig.numFrames) {
+        this.timer += deltaTime;
+        if (this.timer >= this.typeConfig.frameRate) {
+          this.currentFrame =
+              this.currentFrame === this.typeConfig.numFrames - 1 ?
+              0 :
+              this.currentFrame + 1;
+          this.timer = 0;
+        }
+      }
+      this.draw();
+
+      if (!this.isVisible()) {
+        this.remove = true;
+      }
+    }
+  },
+
+  /**
+   * Calculate a random gap size.
+   * - Minimum gap gets wider as speed increses
+   * @param {number} gapCoefficient
+   * @param {number} speed
+   * @return {number} The gap size.
+   */
+  getGap(gapCoefficient, speed) {
+    const minGap = Math.round(
+        this.width * speed + this.typeConfig.minGap * gapCoefficient);
+    const maxGap = Math.round(minGap * Obstacle.MAX_GAP_COEFFICIENT);
+    return getRandomNum(minGap, maxGap);
+  },
+
+  /**
+   * Check if obstacle is visible.
+   * @return {boolean} Whether the obstacle is in the game area.
+   */
+  isVisible() {
+    return this.xPos + this.width > 0;
+  },
+
+  /**
+   * Make a copy of the collision boxes, since these will change based on
+   * obstacle type and size.
+   */
+  cloneCollisionBoxes() {
+    const collisionBoxes = this.typeConfig.collisionBoxes;
+
+    for (let i = collisionBoxes.length - 1; i >= 0; i--) {
+      this.collisionBoxes[i] = new CollisionBox(
+          collisionBoxes[i].x, collisionBoxes[i].y, collisionBoxes[i].width,
+          collisionBoxes[i].height);
+    }
+  },
+};
+
+
+//******************************************************************************
+/**
+ * T-rex game character.
+ * @param {HTMLCanvasElement} canvas
+ * @param {Object} spritePos Positioning within image sprite.
+ * @constructor
+ */
+function Trex(canvas, spritePos) {
+  this.canvas = canvas;
+  this.canvasCtx =
+      /** @type {CanvasRenderingContext2D} */ (canvas.getContext('2d'));
+  this.spritePos = spritePos;
+  this.xPos = 0;
+  this.yPos = 0;
+  this.xInitialPos = 0;
+  // Position when on the ground.
+  this.groundYPos = 0;
+  this.currentFrame = 0;
+  this.currentAnimFrames = [];
+  this.blinkDelay = 0;
+  this.blinkCount = 0;
+  this.animStartTime = 0;
+  this.timer = 0;
+  this.msPerFrame = 1000 / FPS;
+  this.config = Object.assign(Trex.config, Trex.normalJumpConfig);
+  // Current status.
+  this.status = Trex.status.WAITING;
+  this.jumping = false;
+  this.ducking = false;
+  this.jumpVelocity = 0;
+  this.reachedMinHeight = false;
+  this.speedDrop = false;
+  this.jumpCount = 0;
+  this.jumpspotX = 0;
+  this.altGameModeEnabled = false;
+  this.flashing = false;
+
+  this.init();
+}
+
+
+/**
+ * T-rex player config.
+ */
+Trex.config = {
+  DROP_VELOCITY: -5,
+  FLASH_OFF: 175,
+  FLASH_ON: 100,
+  HEIGHT: 47,
+  HEIGHT_DUCK: 25,
+  INTRO_DURATION: 1500,
+  SPEED_DROP_COEFFICIENT: 3,
+  SPRITE_WIDTH: 262,
+  START_X_POS: 50,
+  WIDTH: 44,
+  WIDTH_DUCK: 59,
+};
+
+Trex.slowJumpConfig = {
+  GRAVITY: 0.25,
+  MAX_JUMP_HEIGHT: 50,
+  MIN_JUMP_HEIGHT: 45,
+  INITIAL_JUMP_VELOCITY: -20,
+};
+
+Trex.normalJumpConfig = {
+  GRAVITY: 0.6,
+  MAX_JUMP_HEIGHT: 30,
+  MIN_JUMP_HEIGHT: 30,
+  INITIAL_JUMP_VELOCITY: -10,
+};
+
+/**
+ * Used in collision detection.
+ * @enum {Array<CollisionBox>}
+ */
+Trex.collisionBoxes = {
+  DUCKING: [new CollisionBox(1, 18, 55, 25)],
+  RUNNING: [
+    new CollisionBox(22, 0, 17, 16),
+    new CollisionBox(1, 18, 30, 9),
+    new CollisionBox(10, 35, 14, 8),
+    new CollisionBox(1, 24, 29, 5),
+    new CollisionBox(5, 30, 21, 4),
+    new CollisionBox(9, 34, 15, 4),
+  ],
+};
+
+
+/**
+ * Animation states.
+ * @enum {string}
+ */
+Trex.status = {
+  CRASHED: 'CRASHED',
+  DUCKING: 'DUCKING',
+  JUMPING: 'JUMPING',
+  RUNNING: 'RUNNING',
+  WAITING: 'WAITING',
+};
+
+/**
+ * Blinking coefficient.
+ * @const
+ */
+Trex.BLINK_TIMING = 7000;
+
+
+/**
+ * Animation config for different states.
+ * @enum {Object}
+ */
+Trex.animFrames = {
+  WAITING: {
+    frames: [44, 0],
+    msPerFrame: 1000 / 3,
+  },
+  RUNNING: {
+    frames: [88, 132],
+    msPerFrame: 1000 / 12,
+  },
+  CRASHED: {
+    frames: [220],
+    msPerFrame: 1000 / 60,
+  },
+  JUMPING: {
+    frames: [0],
+    msPerFrame: 1000 / 60,
+  },
+  DUCKING: {
+    frames: [264, 323],
+    msPerFrame: 1000 / 8,
+  },
+};
+
+
+Trex.prototype = {
+  /**
+   * T-rex player initaliser.
+   * Sets the t-rex to blink at random intervals.
+   */
+  init() {
+    this.groundYPos = Runner.defaultDimensions.HEIGHT - this.config.HEIGHT -
+        Runner.config.BOTTOM_PAD;
+    this.yPos = this.groundYPos;
+    this.minJumpHeight = this.groundYPos - this.config.MIN_JUMP_HEIGHT;
+
+    this.draw(0, 0);
+    this.update(0, Trex.status.WAITING);
+  },
+
+  /**
+   * Assign the appropriate jump parameters based on the game speed.
+   */
+  enableSlowConfig: function() {
+    const jumpConfig =
+        Runner.slowDown ? Trex.slowJumpConfig : Trex.normalJumpConfig;
+    Trex.config = Object.assign(Trex.config, jumpConfig);
+
+    this.adjustAltGameConfigForSlowSpeed();
+  },
+
+  /**
+   * Enables the alternative game. Redefines the dino config.
+   * @param {Object} spritePos New positioning within image sprite.
+   */
+  enableAltGameMode: function(spritePos) {
+    this.altGameModeEnabled = true;
+    this.spritePos = spritePos;
+    const spriteDefinition = Runner.spriteDefinition['TREX'];
+
+    // Update animation frames.
+    Trex.animFrames.RUNNING.frames =
+        [spriteDefinition.RUNNING_1.x, spriteDefinition.RUNNING_2.x];
+    Trex.animFrames.CRASHED.frames = [spriteDefinition.CRASHED.x];
+
+    if (typeof spriteDefinition.JUMPING.x == 'object') {
+      Trex.animFrames.JUMPING.frames = spriteDefinition.JUMPING.x;
+    } else {
+      Trex.animFrames.JUMPING.frames = [spriteDefinition.JUMPING.x];
+    }
+
+    Trex.animFrames.DUCKING.frames =
+        [spriteDefinition.DUCKING_1.x, spriteDefinition.DUCKING_2.x];
+
+    // Update Trex config
+    Trex.config.GRAVITY = spriteDefinition.GRAVITY || Trex.config.GRAVITY;
+    Trex.config.HEIGHT = spriteDefinition.RUNNING_1.h,
+    Trex.config.INITIAL_JUMP_VELOCITY = spriteDefinition.INITIAL_JUMP_VELOCITY;
+    Trex.config.MAX_JUMP_HEIGHT = spriteDefinition.MAX_JUMP_HEIGHT;
+    Trex.config.MIN_JUMP_HEIGHT = spriteDefinition.MIN_JUMP_HEIGHT;
+    Trex.config.WIDTH = spriteDefinition.RUNNING_1.w;
+    Trex.config.WIDTH_CRASHED = spriteDefinition.CRASHED.w;
+    Trex.config.WIDTH_JUMP = spriteDefinition.JUMPING.w;
+    Trex.config.INVERT_JUMP = spriteDefinition.INVERT_JUMP;
+
+    this.adjustAltGameConfigForSlowSpeed(spriteDefinition.GRAVITY);
+    this.config = Trex.config;
+
+    // Adjust bottom horizon placement.
+    this.groundYPos = Runner.defaultDimensions.HEIGHT - this.config.HEIGHT -
+        Runner.spriteDefinition['BOTTOM_PAD'];
+    this.yPos = this.groundYPos;
+    this.reset();
+  },
+
+  /**
+   * Slow speeds adjustments for the alt game modes.
+   * @param {number=} opt_gravityValue
+   */
+  adjustAltGameConfigForSlowSpeed: function(opt_gravityValue) {
+    if (Runner.slowDown) {
+      if (opt_gravityValue) {
+        Trex.config.GRAVITY = opt_gravityValue / 1.5;
+      }
+      Trex.config.MIN_JUMP_HEIGHT *= 1.5;
+      Trex.config.MAX_JUMP_HEIGHT *= 1.5;
+      Trex.config.INITIAL_JUMP_VELOCITY =
+          Trex.config.INITIAL_JUMP_VELOCITY * 1.5;
+    }
+  },
+
+  /**
+   * Setter whether dino is flashing.
+   * @param {boolean} status
+   */
+  setFlashing: function(status) {
+    this.flashing = status;
+  },
+
+  /**
+   * Setter for the jump velocity.
+   * The approriate drop velocity is also set.
+   * @param {number} setting
+   */
+  setJumpVelocity(setting) {
+    this.config.INITIAL_JUMP_VELOCITY = -setting;
+    this.config.DROP_VELOCITY = -setting / 2;
+  },
+
+  /**
+   * Set the animation status.
+   * @param {!number} deltaTime
+   * @param {Trex.status=} opt_status Optional status to switch to.
+   */
+  update(deltaTime, opt_status) {
+    this.timer += deltaTime;
+
+    // Update the status.
+    if (opt_status) {
+      this.status = opt_status;
+      this.currentFrame = 0;
+      this.msPerFrame = Trex.animFrames[opt_status].msPerFrame;
+      this.currentAnimFrames = Trex.animFrames[opt_status].frames;
+
+      if (opt_status === Trex.status.WAITING) {
+        this.animStartTime = getTimeStamp();
+        this.setBlinkDelay();
+      }
+    }
+    // Game intro animation, T-rex moves in from the left.
+    if (this.playingIntro && this.xPos < this.config.START_X_POS) {
+      this.xPos += Math.round((this.config.START_X_POS /
+          this.config.INTRO_DURATION) * deltaTime);
+      this.xInitialPos = this.xPos;
+    }
+
+    if (this.status === Trex.status.WAITING) {
+      this.blink(getTimeStamp());
+    } else {
+      this.draw(this.currentAnimFrames[this.currentFrame], 0);
+    }
+
+    // Update the frame position.
+    if (!this.flashing && this.timer >= this.msPerFrame) {
+      this.currentFrame = this.currentFrame ==
+          this.currentAnimFrames.length - 1 ? 0 : this.currentFrame + 1;
+      this.timer = 0;
+    }
+
+    // Speed drop becomes duck if the down key is still being pressed.
+    if (this.speedDrop && this.yPos === this.groundYPos) {
+      this.speedDrop = false;
+      this.setDuck(true);
+    }
+  },
+
+  /**
+   * Draw the t-rex to a particular position.
+   * @param {number} x
+   * @param {number} y
+   */
+  draw(x, y) {
+    let sourceX = x;
+    let sourceY = y;
+    let sourceWidth = this.ducking && this.status !== Trex.status.CRASHED ?
+        this.config.WIDTH_DUCK :
+        this.config.WIDTH;
+    let sourceHeight = this.config.HEIGHT;
+    const outputHeight = sourceHeight;
+    const outputWidth =
+        this.altGameModeEnabled && this.status == Trex.status.CRASHED ?
+        this.config.WIDTH_CRASHED :
+        this.config.WIDTH;
+
+    let jumpOffset = Runner.spriteDefinition.TREX.JUMPING.xOffset;
+
+    // Width of sprite can change on jump or crashed.
+    if (this.altGameModeEnabled) {
+      if (this.jumping && this.status !== Trex.status.CRASHED) {
+        sourceWidth = this.config.WIDTH_JUMP;
+      } else if (this.status == Trex.status.CRASHED) {
+        sourceWidth = this.config.WIDTH_CRASHED;
+      }
+    }
+
+    if (IS_HIDPI) {
+      sourceX *= 2;
+      sourceY *= 2;
+      sourceWidth *= 2;
+      sourceHeight *= 2;
+      jumpOffset *= 2;
+    }
+
+    // Adjustments for sprite sheet position.
+    sourceX += this.spritePos.x;
+    sourceY += this.spritePos.y;
+
+    // Flashing.
+    if (this.flashing) {
+      if (this.timer < this.config.FLASH_ON) {
+        this.canvasCtx.globalAlpha = 0.5;
+      } else if (this.timer > this.config.FLASH_OFF) {
+        this.timer = 0;
+      }
+    }
+
+    // Ducking.
+    if (this.ducking && this.status !== Trex.status.CRASHED) {
+      this.canvasCtx.drawImage(Runner.imageSprite, sourceX, sourceY,
+          sourceWidth, sourceHeight,
+          this.xPos, this.yPos,
+          this.config.WIDTH_DUCK, outputHeight);
+    } else if (
+        this.altGameModeEnabled && this.jumping &&
+        this.status !== Trex.status.CRASHED) {
+      // Jumping with adjustments.
+      this.canvasCtx.drawImage(
+          Runner.imageSprite, sourceX, sourceY, sourceWidth, sourceHeight,
+          this.xPos - jumpOffset, this.yPos, this.config.WIDTH_JUMP,
+          outputHeight);
+    } else {
+      // Crashed whilst ducking. Trex is standing up so needs adjustment.
+      if (this.ducking && this.status === Trex.status.CRASHED) {
+        this.xPos++;
+      }
+      // Standing / running
+      this.canvasCtx.drawImage(
+          Runner.imageSprite, sourceX, sourceY, sourceWidth, sourceHeight,
+          this.xPos, this.yPos, outputWidth, outputHeight);
+    }
+    this.canvasCtx.globalAlpha = 1;
+  },
+
+  /**
+   * Sets a random time for the blink to happen.
+   */
+  setBlinkDelay() {
+    this.blinkDelay = Math.ceil(Math.random() * Trex.BLINK_TIMING);
+  },
+
+  /**
+   * Make t-rex blink at random intervals.
+   * @param {number} time Current time in milliseconds.
+   */
+  blink(time) {
+    const deltaTime = time - this.animStartTime;
+
+    if (deltaTime >= this.blinkDelay) {
+      this.draw(this.currentAnimFrames[this.currentFrame], 0);
+
+      if (this.currentFrame === 1) {
+        // Set new random delay to blink.
+        this.setBlinkDelay();
+        this.animStartTime = time;
+        this.blinkCount++;
+      }
+    }
+  },
+
+  /**
+   * Initialise a jump.
+   * @param {number} speed
+   */
+  startJump(speed) {
+    if (!this.jumping) {
+      this.update(0, Trex.status.JUMPING);
+      // Tweak the jump velocity based on the speed.
+      this.jumpVelocity = this.config.INITIAL_JUMP_VELOCITY - (speed / 10);
+      this.jumping = true;
+      this.reachedMinHeight = false;
+      this.speedDrop = false;
+
+      if (this.config.INVERT_JUMP) {
+        this.minJumpHeight = this.groundYPos + this.config.MIN_JUMP_HEIGHT;
+      }
+    }
+  },
+
+  /**
+   * Jump is complete, falling down.
+   */
+  endJump() {
+    if (this.reachedMinHeight &&
+        this.jumpVelocity < this.config.DROP_VELOCITY) {
+      this.jumpVelocity = this.config.DROP_VELOCITY;
+    }
+  },
+
+  /**
+   * Update frame for a jump.
+   * @param {number} deltaTime
+   */
+  updateJump(deltaTime) {
+    const msPerFrame = Trex.animFrames[this.status].msPerFrame;
+    const framesElapsed = deltaTime / msPerFrame;
+
+    // Speed drop makes Trex fall faster.
+    if (this.speedDrop) {
+      this.yPos += Math.round(this.jumpVelocity *
+          this.config.SPEED_DROP_COEFFICIENT * framesElapsed);
+    } else if (this.config.INVERT_JUMP) {
+      this.yPos -= Math.round(this.jumpVelocity * framesElapsed);
+    } else {
+      this.yPos += Math.round(this.jumpVelocity * framesElapsed);
+    }
+
+    this.jumpVelocity += this.config.GRAVITY * framesElapsed;
+
+    // Minimum height has been reached.
+    if (this.config.INVERT_JUMP && (this.yPos > this.minJumpHeight) ||
+        !this.config.INVERT_JUMP && (this.yPos < this.minJumpHeight) ||
+        this.speedDrop) {
+      this.reachedMinHeight = true;
+    }
+
+    // Reached max height.
+    if (this.config.INVERT_JUMP && (this.yPos > -this.config.MAX_JUMP_HEIGHT) ||
+        !this.config.INVERT_JUMP && (this.yPos < this.config.MAX_JUMP_HEIGHT) ||
+        this.speedDrop) {
+      this.endJump();
+    }
+
+    // Back down at ground level. Jump completed.
+    if ((this.config.INVERT_JUMP && this.yPos) < this.groundYPos ||
+        (!this.config.INVERT_JUMP && this.yPos) > this.groundYPos) {
+      this.reset();
+      this.jumpCount++;
+
+      if (Runner.audioCues) {
+        Runner.generatedSoundFx.loopFootSteps();
+      }
+    }
+  },
+
+  /**
+   * Set the speed drop. Immediately cancels the current jump.
+   */
+  setSpeedDrop() {
+    this.speedDrop = true;
+    this.jumpVelocity = 1;
+  },
+
+  /**
+   * @param {boolean} isDucking
+   */
+  setDuck(isDucking) {
+    if (isDucking && this.status !== Trex.status.DUCKING) {
+      this.update(0, Trex.status.DUCKING);
+      this.ducking = true;
+    } else if (this.status === Trex.status.DUCKING) {
+      this.update(0, Trex.status.RUNNING);
+      this.ducking = false;
+    }
+  },
+
+  /**
+   * Reset the t-rex to running at start of game.
+   */
+  reset() {
+    this.xPos = this.xInitialPos;
+    this.yPos = this.groundYPos;
+    this.jumpVelocity = 0;
+    this.jumping = false;
+    this.ducking = false;
+    this.update(0, Trex.status.RUNNING);
+    this.midair = false;
+    this.speedDrop = false;
+    this.jumpCount = 0;
+  },
+};
+
+
+//******************************************************************************
+
+/**
+ * Handles displaying the distance meter.
+ * @param {!HTMLCanvasElement} canvas
+ * @param {Object} spritePos Image position in sprite.
+ * @param {number} canvasWidth
+ * @constructor
+ */
+function DistanceMeter(canvas, spritePos, canvasWidth) {
+  this.canvas = canvas;
+  this.canvasCtx =
+      /** @type {CanvasRenderingContext2D} */ (canvas.getContext('2d'));
+  this.image = Runner.imageSprite;
+  this.spritePos = spritePos;
+  this.x = 0;
+  this.y = 5;
+
+  this.currentDistance = 0;
+  this.maxScore = 0;
+  this.highScore = '0';
+  this.container = null;
+
+  this.digits = [];
+  this.achievement = false;
+  this.defaultString = '';
+  this.flashTimer = 0;
+  this.flashIterations = 0;
+  this.invertTrigger = false;
+  this.flashingRafId = null;
+  this.highScoreBounds = {};
+  this.highScoreFlashing = false;
+
+  this.config = DistanceMeter.config;
+  this.maxScoreUnits = this.config.MAX_DISTANCE_UNITS;
+  this.canvasWidth = canvasWidth;
+  this.init(canvasWidth);
+}
+
+
+/**
+ * @enum {number}
+ */
+DistanceMeter.dimensions = {
+  WIDTH: 10,
+  HEIGHT: 13,
+  DEST_WIDTH: 11,
+};
+
+
+/**
+ * Y positioning of the digits in the sprite sheet.
+ * X position is always 0.
+ * @type {Array<number>}
+ */
+DistanceMeter.yPos = [0, 13, 27, 40, 53, 67, 80, 93, 107, 120];
+
+
+/**
+ * Distance meter config.
+ * @enum {number}
+ */
+DistanceMeter.config = {
+  // Number of digits.
+  MAX_DISTANCE_UNITS: 5,
+
+  // Distance that causes achievement animation.
+  ACHIEVEMENT_DISTANCE: 100,
+
+  // Used for conversion from pixel distance to a scaled unit.
+  COEFFICIENT: 0.025,
+
+  // Flash duration in milliseconds.
+  FLASH_DURATION: 1000 / 4,
+
+  // Flash iterations for achievement animation.
+  FLASH_ITERATIONS: 3,
+
+  // Padding around the high score hit area.
+  HIGH_SCORE_HIT_AREA_PADDING: 4,
+};
+
+
+DistanceMeter.prototype = {
+  /**
+   * Initialise the distance meter to '00000'.
+   * @param {number} width Canvas width in px.
+   */
+  init(width) {
+    let maxDistanceStr = '';
+
+    this.calcXPos(width);
+    this.maxScore = this.maxScoreUnits;
+    for (let i = 0; i < this.maxScoreUnits; i++) {
+      this.draw(i, 0);
+      this.defaultString += '0';
+      maxDistanceStr += '9';
+    }
+
+    this.maxScore = parseInt(maxDistanceStr, 10);
+  },
+
+  /**
+   * Calculate the xPos in the canvas.
+   * @param {number} canvasWidth
+   */
+  calcXPos(canvasWidth) {
+    this.x = canvasWidth - (DistanceMeter.dimensions.DEST_WIDTH *
+        (this.maxScoreUnits + 1));
+  },
+
+  /**
+   * Draw a digit to canvas.
+   * @param {number} digitPos Position of the digit.
+   * @param {number} value Digit value 0-9.
+   * @param {boolean=} opt_highScore Whether drawing the high score.
+   */
+  draw(digitPos, value, opt_highScore) {
+    let sourceWidth = DistanceMeter.dimensions.WIDTH;
+    let sourceHeight = DistanceMeter.dimensions.HEIGHT;
+    let sourceX = DistanceMeter.dimensions.WIDTH * value;
+    let sourceY = 0;
+
+    const targetX = digitPos * DistanceMeter.dimensions.DEST_WIDTH;
+    const targetY = this.y;
+    const targetWidth = DistanceMeter.dimensions.WIDTH;
+    const targetHeight = DistanceMeter.dimensions.HEIGHT;
+
+    // For high DPI we 2x source values.
+    if (IS_HIDPI) {
+      sourceWidth *= 2;
+      sourceHeight *= 2;
+      sourceX *= 2;
+    }
+
+    sourceX += this.spritePos.x;
+    sourceY += this.spritePos.y;
+
+    this.canvasCtx.save();
+
+    if (IS_RTL) {
+      if (opt_highScore) {
+        this.canvasCtx.translate(
+            this.canvasWidth -
+                (DistanceMeter.dimensions.WIDTH * (this.maxScoreUnits + 3)),
+            this.y);
+      } else {
+        this.canvasCtx.translate(
+            this.canvasWidth - DistanceMeter.dimensions.WIDTH, this.y);
+      }
+      this.canvasCtx.scale(-1, 1);
+    } else {
+      const highScoreX =
+          this.x - (this.maxScoreUnits * 2) * DistanceMeter.dimensions.WIDTH;
+      if (opt_highScore) {
+        this.canvasCtx.translate(highScoreX, this.y);
+      } else {
+        this.canvasCtx.translate(this.x, this.y);
+      }
+    }
+
+    this.canvasCtx.drawImage(
+        this.image,
+        sourceX,
+        sourceY,
+        sourceWidth,
+        sourceHeight,
+        targetX,
+        targetY,
+        targetWidth,
+        targetHeight,
+    );
+
+    this.canvasCtx.restore();
+  },
+
+  /**
+   * Covert pixel distance to a 'real' distance.
+   * @param {number} distance Pixel distance ran.
+   * @return {number} The 'real' distance ran.
+   */
+  getActualDistance(distance) {
+    return distance ? Math.round(distance * this.config.COEFFICIENT) : 0;
+  },
+
+  /**
+   * Update the distance meter.
+   * @param {number} distance
+   * @param {number} deltaTime
+   * @return {boolean} Whether the acheivement sound fx should be played.
+   */
+  update(deltaTime, distance) {
+    let paint = true;
+    let playSound = false;
+
+    if (!this.achievement) {
+      distance = this.getActualDistance(distance);
+      // Score has gone beyond the initial digit count.
+      if (distance > this.maxScore && this.maxScoreUnits ==
+        this.config.MAX_DISTANCE_UNITS) {
+        this.maxScoreUnits++;
+        this.maxScore = parseInt(this.maxScore + '9', 10);
+      } else {
+        this.distance = 0;
+      }
+
+      if (distance > 0) {
+        // Achievement unlocked.
+        if (distance % this.config.ACHIEVEMENT_DISTANCE === 0) {
+          // Flash score and play sound.
+          this.achievement = true;
+          this.flashTimer = 0;
+          playSound = true;
+        }
+
+        // Create a string representation of the distance with leading 0.
+        const distanceStr = (this.defaultString +
+            distance).substr(-this.maxScoreUnits);
+        this.digits = distanceStr.split('');
+      } else {
+        this.digits = this.defaultString.split('');
+      }
+    } else {
+      // Control flashing of the score on reaching acheivement.
+      if (this.flashIterations <= this.config.FLASH_ITERATIONS) {
+        this.flashTimer += deltaTime;
+
+        if (this.flashTimer < this.config.FLASH_DURATION) {
+          paint = false;
+        } else if (this.flashTimer > this.config.FLASH_DURATION * 2) {
+          this.flashTimer = 0;
+          this.flashIterations++;
+        }
+      } else {
+        this.achievement = false;
+        this.flashIterations = 0;
+        this.flashTimer = 0;
+      }
+    }
+
+    // Draw the digits if not flashing.
+    if (paint) {
+      for (let i = this.digits.length - 1; i >= 0; i--) {
+        this.draw(i, parseInt(this.digits[i], 10));
+      }
+    }
+
+    this.drawHighScore();
+    return playSound;
+  },
+
+  /**
+   * Draw the high score.
+   */
+  drawHighScore() {
+    if (parseInt(this.highScore, 10) > 0) {
+      this.canvasCtx.save();
+      this.canvasCtx.globalAlpha = .8;
+      for (let i = this.highScore.length - 1; i >= 0; i--) {
+        this.draw(i, parseInt(this.highScore[i], 10), true);
+      }
+      this.canvasCtx.restore();
+    }
+  },
+
+  /**
+   * Set the highscore as a array string.
+   * Position of char in the sprite: H - 10, I - 11.
+   * @param {number} distance Distance ran in pixels.
+   */
+  setHighScore(distance) {
+    distance = this.getActualDistance(distance);
+    const highScoreStr = (this.defaultString +
+        distance).substr(-this.maxScoreUnits);
+
+    this.highScore = ['10', '11', ''].concat(highScoreStr.split(''));
+  },
+
+
+  /**
+   * Whether a clicked is in the high score area.
+   * @param {Event} e Event object.
+   * @return {boolean} Whether the click was in the high score bounds.
+   */
+  hasClickedOnHighScore(e) {
+    let x = 0;
+    let y = 0;
+
+    if (e.touches) {
+      // Bounds for touch differ from pointer.
+      const canvasBounds = this.canvas.getBoundingClientRect();
+      x = e.touches[0].clientX - canvasBounds.left;
+      y = e.touches[0].clientY - canvasBounds.top;
+    } else {
+      x = e.offsetX;
+      y = e.offsetY;
+    }
+
+    this.highScoreBounds = this.getHighScoreBounds();
+    return x >= this.highScoreBounds.x && x <=
+        this.highScoreBounds.x + this.highScoreBounds.width &&
+        y >= this.highScoreBounds.y && y <=
+        this.highScoreBounds.y + this.highScoreBounds.height;
+  },
+
+  /**
+   * Get the bounding box for the high score.
+   * @return {Object} Object with x, y, width and height properties.
+   */
+  getHighScoreBounds() {
+    return {
+      x: (this.x - (this.maxScoreUnits * 2) * DistanceMeter.dimensions.WIDTH) -
+          DistanceMeter.config.HIGH_SCORE_HIT_AREA_PADDING,
+      y: this.y,
+      width: DistanceMeter.dimensions.WIDTH * (this.highScore.length + 1) +
+          DistanceMeter.config.HIGH_SCORE_HIT_AREA_PADDING,
+      height: DistanceMeter.dimensions.HEIGHT +
+          (DistanceMeter.config.HIGH_SCORE_HIT_AREA_PADDING * 2),
+    };
+  },
+
+  /**
+   * Animate flashing the high score to indicate ready for resetting.
+   * The flashing stops following this.config.FLASH_ITERATIONS x 2 flashes.
+   */
+  flashHighScore() {
+    const now = getTimeStamp();
+    const deltaTime = now - (this.frameTimeStamp || now);
+    let paint = true;
+    this.frameTimeStamp = now;
+
+    // Reached the max number of flashes.
+    if (this.flashIterations > this.config.FLASH_ITERATIONS * 2) {
+      this.cancelHighScoreFlashing();
+      return;
+    }
+
+    this.flashTimer += deltaTime;
+
+    if (this.flashTimer < this.config.FLASH_DURATION) {
+      paint = false;
+    } else if (this.flashTimer > this.config.FLASH_DURATION * 2) {
+      this.flashTimer = 0;
+      this.flashIterations++;
+    }
+
+    if (paint) {
+      this.drawHighScore();
+    } else {
+      this.clearHighScoreBounds();
+    }
+    // Frame update.
+    this.flashingRafId =
+        requestAnimationFrame(this.flashHighScore.bind(this));
+  },
+
+  /**
+   * Draw empty rectangle over high score.
+   */
+  clearHighScoreBounds() {
+    this.canvasCtx.save();
+    this.canvasCtx.fillStyle = '#fff';
+    this.canvasCtx.rect(this.highScoreBounds.x, this.highScoreBounds.y,
+        this.highScoreBounds.width, this.highScoreBounds.height);
+    this.canvasCtx.fill();
+    this.canvasCtx.restore();
+  },
+
+  /**
+   * Starts the flashing of the high score.
+   */
+  startHighScoreFlashing() {
+    this.highScoreFlashing = true;
+    this.flashHighScore();
+  },
+
+  /**
+   * Whether high score is flashing.
+   * @return {boolean}
+   */
+  isHighScoreFlashing() {
+    return this.highScoreFlashing;
+  },
+
+  /**
+   * Stop flashing the high score.
+   */
+  cancelHighScoreFlashing() {
+    if (this.flashingRafId) {
+      cancelAnimationFrame(this.flashingRafId);
+    }
+    this.flashIterations = 0;
+    this.flashTimer = 0;
+    this.highScoreFlashing = false;
+    this.clearHighScoreBounds();
+    this.drawHighScore();
+  },
+
+  /**
+   * Clear the high score.
+   */
+  resetHighScore() {
+    this.setHighScore(0);
+    this.cancelHighScoreFlashing();
+  },
+
+  /**
+   * Reset the distance meter back to '00000'.
+   */
+  reset() {
+    this.update(0, 0);
+    this.achievement = false;
+  },
+};
+
+
+//******************************************************************************
+
+/**
+ * Cloud background item.
+ * Similar to an obstacle object but without collision boxes.
+ * @param {HTMLCanvasElement} canvas Canvas element.
+ * @param {Object} spritePos Position of image in sprite.
+ * @param {number} containerWidth
+ * @constructor
+ */
+function Cloud(canvas, spritePos, containerWidth) {
+  this.canvas = canvas;
+  this.canvasCtx =
+      /** @type {CanvasRenderingContext2D} */ (this.canvas.getContext('2d'));
+  this.spritePos = spritePos;
+  this.containerWidth = containerWidth;
+  this.xPos = containerWidth;
+  this.yPos = 0;
+  this.remove = false;
+  this.gap =
+      getRandomNum(Cloud.config.MIN_CLOUD_GAP, Cloud.config.MAX_CLOUD_GAP);
+
+  this.init();
+}
+
+
+/**
+ * Cloud object config.
+ * @enum {number}
+ */
+Cloud.config = {
+  HEIGHT: 14,
+  MAX_CLOUD_GAP: 400,
+  MAX_SKY_LEVEL: 30,
+  MIN_CLOUD_GAP: 100,
+  MIN_SKY_LEVEL: 71,
+  WIDTH: 46,
+};
+
+
+Cloud.prototype = {
+  /**
+   * Initialise the cloud. Sets the Cloud height.
+   */
+  init() {
+    this.yPos = getRandomNum(Cloud.config.MAX_SKY_LEVEL,
+        Cloud.config.MIN_SKY_LEVEL);
+    this.draw();
+  },
+
+  /**
+   * Draw the cloud.
+   */
+  draw() {
+    this.canvasCtx.save();
+    let sourceWidth = Cloud.config.WIDTH;
+    let sourceHeight = Cloud.config.HEIGHT;
+    const outputWidth = sourceWidth;
+    const outputHeight = sourceHeight;
+    if (IS_HIDPI) {
+      sourceWidth = sourceWidth * 2;
+      sourceHeight = sourceHeight * 2;
+    }
+
+    this.canvasCtx.drawImage(Runner.imageSprite, this.spritePos.x,
+        this.spritePos.y,
+        sourceWidth, sourceHeight,
+        this.xPos, this.yPos,
+        outputWidth, outputHeight);
+
+    this.canvasCtx.restore();
+  },
+
+  /**
+   * Update the cloud position.
+   * @param {number} speed
+   */
+  update(speed) {
+    if (!this.remove) {
+      this.xPos -= Math.ceil(speed);
+      this.draw();
+
+      // Mark as removeable if no longer in the canvas.
+      if (!this.isVisible()) {
+        this.remove = true;
+      }
+    }
+  },
+
+  /**
+   * Check if the cloud is visible on the stage.
+   * @return {boolean}
+   */
+  isVisible() {
+    return this.xPos + Cloud.config.WIDTH > 0;
+  },
+};
+
+
+/**
+ * Background item.
+ * Similar to cloud, without random y position.
+ * @param {HTMLCanvasElement} canvas Canvas element.
+ * @param {Object} spritePos Position of image in sprite.
+ * @param {number} containerWidth
+ * @param {string} type Element type.
+ * @constructor
+ */
+function BackgroundEl(canvas, spritePos, containerWidth, type) {
+  this.canvas = canvas;
+  this.canvasCtx =
+      /** @type {CanvasRenderingContext2D} */ (this.canvas.getContext('2d'));
+  this.spritePos = spritePos;
+  this.containerWidth = containerWidth;
+  this.xPos = containerWidth;
+  this.yPos = 0;
+  this.remove = false;
+  this.type = type;
+  this.gap =
+      getRandomNum(BackgroundEl.config.MIN_GAP, BackgroundEl.config.MAX_GAP);
+  this.animTimer = 0;
+  this.switchFrames = false;
+
+  this.spriteConfig = {};
+  this.init();
+}
+
+/**
+ * Background element object config.
+ * Real values assigned when game type changes.
+ * @enum {number}
+ */
+BackgroundEl.config = {
+  MAX_BG_ELS: 0,
+  MAX_GAP: 0,
+  MIN_GAP: 0,
+  POS: 0,
+  SPEED: 0,
+  Y_POS: 0,
+  MS_PER_FRAME: 0,  // only needed when BACKGROUND_EL.FIXED is true
+};
+
+
+BackgroundEl.prototype = {
+  /**
+   * Initialise the element setting the y position.
+   */
+  init() {
+    this.spriteConfig = Runner.spriteDefinition.BACKGROUND_EL[this.type];
+    if (this.spriteConfig.FIXED) {
+      this.xPos = this.spriteConfig.FIXED_X_POS;
+    }
+    this.yPos = BackgroundEl.config.Y_POS - this.spriteConfig.HEIGHT +
+        this.spriteConfig.OFFSET;
+    this.draw();
+  },
+
+  /**
+   * Draw the element.
+   */
+  draw() {
+    this.canvasCtx.save();
+    let sourceWidth = this.spriteConfig.WIDTH;
+    let sourceHeight = this.spriteConfig.HEIGHT;
+    let sourceX = this.spriteConfig.X_POS;
+    const outputWidth = sourceWidth;
+    const outputHeight = sourceHeight;
+
+    if (IS_HIDPI) {
+      sourceWidth *= 2;
+      sourceHeight *= 2;
+      sourceX *= 2;
+    }
+
+    this.canvasCtx.drawImage(
+        Runner.imageSprite, sourceX, this.spritePos.y, sourceWidth,
+        sourceHeight, this.xPos, this.yPos, outputWidth, outputHeight);
+
+    this.canvasCtx.restore();
+  },
+
+  /**
+   * Update the background element position.
+   * @param {number} speed
+   */
+  update(speed) {
+    if (!this.remove) {
+      if (this.spriteConfig.FIXED) {
+        this.animTimer += speed;
+        if (this.animTimer > BackgroundEl.config.MS_PER_FRAME) {
+          this.animTimer = 0;
+          this.switchFrames = !this.switchFrames;
+        }
+
+        if (this.spriteConfig.FIXED_Y_POS_1 &&
+            this.spriteConfig.FIXED_Y_POS_2) {
+          this.yPos = this.switchFrames ? this.spriteConfig.FIXED_Y_POS_1 :
+                                          this.spriteConfig.FIXED_Y_POS_2;
+        }
+      } else {
+        // Fixed speed, regardless of actual game speed.
+        this.xPos -= BackgroundEl.config.SPEED;
+      }
+      this.draw();
+
+      // Mark as removable if no longer in the canvas.
+      if (!this.isVisible()) {
+        this.remove = true;
+      }
+    }
+  },
+
+  /**
+   * Check if the element is visible on the stage.
+   * @return {boolean}
+   */
+  isVisible() {
+    return this.xPos + this.spriteConfig.WIDTH > 0;
+  },
+};
+
+
+
+//******************************************************************************
+
+/**
+ * Nightmode shows a moon and stars on the horizon.
+ * @param {HTMLCanvasElement} canvas
+ * @param {number} spritePos
+ * @param {number} containerWidth
+ * @constructor
+ */
+function NightMode(canvas, spritePos, containerWidth) {
+  this.spritePos = spritePos;
+  this.canvas = canvas;
+  this.canvasCtx =
+      /** @type {CanvasRenderingContext2D} */ (canvas.getContext('2d'));
+  this.xPos = containerWidth - 50;
+  this.yPos = 30;
+  this.currentPhase = 0;
+  this.opacity = 0;
+  this.containerWidth = containerWidth;
+  this.stars = [];
+  this.drawStars = false;
+  this.placeStars();
+}
+
+/**
+ * @enum {number}
+ */
+NightMode.config = {
+  FADE_SPEED: 0.035,
+  HEIGHT: 40,
+  MOON_SPEED: 0.25,
+  NUM_STARS: 2,
+  STAR_SIZE: 9,
+  STAR_SPEED: 0.3,
+  STAR_MAX_Y: 70,
+  WIDTH: 20,
+};
+
+NightMode.phases = [140, 120, 100, 60, 40, 20, 0];
+
+NightMode.prototype = {
+  /**
+   * Update moving moon, changing phases.
+   * @param {boolean} activated Whether night mode is activated.
+   */
+  update(activated) {
+    // Moon phase.
+    if (activated && this.opacity === 0) {
+      this.currentPhase++;
+
+      if (this.currentPhase >= NightMode.phases.length) {
+        this.currentPhase = 0;
+      }
+    }
+
+    // Fade in / out.
+    if (activated && (this.opacity < 1 || this.opacity === 0)) {
+      this.opacity += NightMode.config.FADE_SPEED;
+    } else if (this.opacity > 0) {
+      this.opacity -= NightMode.config.FADE_SPEED;
+    }
+
+    // Set moon positioning.
+    if (this.opacity > 0) {
+      this.xPos = this.updateXPos(this.xPos, NightMode.config.MOON_SPEED);
+
+      // Update stars.
+      if (this.drawStars) {
+        for (let i = 0; i < NightMode.config.NUM_STARS; i++) {
+          this.stars[i].x =
+              this.updateXPos(this.stars[i].x, NightMode.config.STAR_SPEED);
+        }
+      }
+      this.draw();
+    } else {
+      this.opacity = 0;
+      this.placeStars();
+    }
+    this.drawStars = true;
+  },
+
+  updateXPos(currentPos, speed) {
+    if (currentPos < -NightMode.config.WIDTH) {
+      currentPos = this.containerWidth;
+    } else {
+      currentPos -= speed;
+    }
+    return currentPos;
+  },
+
+  draw() {
+    let moonSourceWidth = this.currentPhase === 3 ? NightMode.config.WIDTH * 2 :
+                                                    NightMode.config.WIDTH;
+    let moonSourceHeight = NightMode.config.HEIGHT;
+    let moonSourceX = this.spritePos.x + NightMode.phases[this.currentPhase];
+    const moonOutputWidth = moonSourceWidth;
+    let starSize = NightMode.config.STAR_SIZE;
+    let starSourceX = spriteDefinitionByType.original.LDPI.STAR.x;
+
+    if (IS_HIDPI) {
+      moonSourceWidth *= 2;
+      moonSourceHeight *= 2;
+      moonSourceX = this.spritePos.x +
+          (NightMode.phases[this.currentPhase] * 2);
+      starSize *= 2;
+      starSourceX = spriteDefinitionByType.original.HDPI.STAR.x;
+    }
+
+    this.canvasCtx.save();
+    this.canvasCtx.globalAlpha = this.opacity;
+
+    // Stars.
+    if (this.drawStars) {
+      for (let i = 0; i < NightMode.config.NUM_STARS; i++) {
+        this.canvasCtx.drawImage(
+            Runner.origImageSprite, starSourceX, this.stars[i].sourceY,
+            starSize, starSize, Math.round(this.stars[i].x), this.stars[i].y,
+            NightMode.config.STAR_SIZE, NightMode.config.STAR_SIZE);
+      }
+    }
+
+    // Moon.
+    this.canvasCtx.drawImage(
+        Runner.origImageSprite, moonSourceX, this.spritePos.y, moonSourceWidth,
+        moonSourceHeight, Math.round(this.xPos), this.yPos, moonOutputWidth,
+        NightMode.config.HEIGHT);
+
+    this.canvasCtx.globalAlpha = 1;
+    this.canvasCtx.restore();
+  },
+
+  // Do star placement.
+  placeStars() {
+    const segmentSize = Math.round(this.containerWidth /
+        NightMode.config.NUM_STARS);
+
+    for (let i = 0; i < NightMode.config.NUM_STARS; i++) {
+      this.stars[i] = {};
+      this.stars[i].x = getRandomNum(segmentSize * i, segmentSize * (i + 1));
+      this.stars[i].y = getRandomNum(0, NightMode.config.STAR_MAX_Y);
+
+      if (IS_HIDPI) {
+        this.stars[i].sourceY = spriteDefinitionByType.original.HDPI.STAR.y +
+            NightMode.config.STAR_SIZE * 2 * i;
+      } else {
+        this.stars[i].sourceY = spriteDefinitionByType.original.LDPI.STAR.y +
+            NightMode.config.STAR_SIZE * i;
+      }
+    }
+  },
+
+  reset() {
+    this.currentPhase = 0;
+    this.opacity = 0;
+    this.update(false);
+  },
+
+};
+
+
+//******************************************************************************
+
+/**
+ * Horizon Line.
+ * Consists of two connecting lines. Randomly assigns a flat / bumpy horizon.
+ * @param {HTMLCanvasElement} canvas
+ * @param {Object} lineConfig Configuration object.
+ * @constructor
+ */
+function HorizonLine(canvas, lineConfig) {
+  let sourceX = lineConfig.SOURCE_X;
+  let sourceY = lineConfig.SOURCE_Y;
+
+  if (IS_HIDPI) {
+    sourceX *= 2;
+    sourceY *= 2;
+  }
+
+  this.spritePos = {x: sourceX, y: sourceY};
+  this.canvas = canvas;
+  this.canvasCtx =
+      /** @type {CanvasRenderingContext2D} */ (canvas.getContext('2d'));
+  this.sourceDimensions = {};
+  this.dimensions = lineConfig;
+
+  this.sourceXPos = [this.spritePos.x, this.spritePos.x +
+      this.dimensions.WIDTH];
+  this.xPos = [];
+  this.yPos = 0;
+  this.bumpThreshold = 0.5;
+
+  this.setSourceDimensions(lineConfig);
+  this.draw();
+}
+
+
+/**
+ * Horizon line dimensions.
+ * @enum {number}
+ */
+HorizonLine.dimensions = {
+  WIDTH: 600,
+  HEIGHT: 12,
+  YPOS: 127,
+};
+
+
+HorizonLine.prototype = {
+  /**
+   * Set the source dimensions of the horizon line.
+   */
+  setSourceDimensions(newDimensions) {
+    for (const dimension in newDimensions) {
+      if (dimension !== 'SOURCE_X' && dimension !== 'SOURCE_Y') {
+        if (IS_HIDPI) {
+          if (dimension !== 'YPOS') {
+            this.sourceDimensions[dimension] = newDimensions[dimension] * 2;
+          }
+        } else {
+          this.sourceDimensions[dimension] = newDimensions[dimension];
+        }
+        this.dimensions[dimension] = newDimensions[dimension];
+      }
+    }
+
+    this.xPos = [0, newDimensions.WIDTH];
+    this.yPos = newDimensions.YPOS;
+  },
+
+  /**
+   * Return the crop x position of a type.
+   */
+  getRandomType() {
+    return Math.random() > this.bumpThreshold ? this.dimensions.WIDTH : 0;
+  },
+
+  /**
+   * Draw the horizon line.
+   */
+  draw() {
+    this.canvasCtx.drawImage(Runner.imageSprite, this.sourceXPos[0],
+        this.spritePos.y,
+        this.sourceDimensions.WIDTH, this.sourceDimensions.HEIGHT,
+        this.xPos[0], this.yPos,
+        this.dimensions.WIDTH, this.dimensions.HEIGHT);
+
+    this.canvasCtx.drawImage(Runner.imageSprite, this.sourceXPos[1],
+        this.spritePos.y,
+        this.sourceDimensions.WIDTH, this.sourceDimensions.HEIGHT,
+        this.xPos[1], this.yPos,
+        this.dimensions.WIDTH, this.dimensions.HEIGHT);
+  },
+
+  /**
+   * Update the x position of an indivdual piece of the line.
+   * @param {number} pos Line position.
+   * @param {number} increment
+   */
+  updateXPos(pos, increment) {
+    const line1 = pos;
+    const line2 = pos === 0 ? 1 : 0;
+
+    this.xPos[line1] -= increment;
+    this.xPos[line2] = this.xPos[line1] + this.dimensions.WIDTH;
+
+    if (this.xPos[line1] <= -this.dimensions.WIDTH) {
+      this.xPos[line1] += this.dimensions.WIDTH * 2;
+      this.xPos[line2] = this.xPos[line1] - this.dimensions.WIDTH;
+      this.sourceXPos[line1] = this.getRandomType() + this.spritePos.x;
+    }
+  },
+
+  /**
+   * Update the horizon line.
+   * @param {number} deltaTime
+   * @param {number} speed
+   */
+  update(deltaTime, speed) {
+    const increment = Math.floor(speed * (FPS / 1000) * deltaTime);
+
+    if (this.xPos[0] <= 0) {
+      this.updateXPos(0, increment);
+    } else {
+      this.updateXPos(1, increment);
+    }
+    this.draw();
+  },
+
+  /**
+   * Reset horizon to the starting position.
+   */
+  reset() {
+    this.xPos[0] = 0;
+    this.xPos[1] = this.dimensions.WIDTH;
+  },
+};
+
+
+//******************************************************************************
+
+/**
+ * Horizon background class.
+ * @param {HTMLCanvasElement} canvas
+ * @param {Object} spritePos Sprite positioning.
+ * @param {Object} dimensions Canvas dimensions.
+ * @param {number} gapCoefficient
+ * @constructor
+ */
+function Horizon(canvas, spritePos, dimensions, gapCoefficient) {
+  this.canvas = canvas;
+  this.canvasCtx =
+      /** @type {CanvasRenderingContext2D} */ (this.canvas.getContext('2d'));
+  this.config = Horizon.config;
+  this.dimensions = dimensions;
+  this.gapCoefficient = gapCoefficient;
+  this.obstacles = [];
+  this.obstacleHistory = [];
+  this.horizonOffsets = [0, 0];
+  this.cloudFrequency = this.config.CLOUD_FREQUENCY;
+  this.spritePos = spritePos;
+  this.nightMode = null;
+  this.altGameModeActive = false;
+
+  // Cloud
+  this.clouds = [];
+  this.cloudSpeed = this.config.BG_CLOUD_SPEED;
+
+  // Background elements
+  this.backgroundEls = [];
+  this.lastEl = null;
+  this.backgroundSpeed = this.config.BG_CLOUD_SPEED;
+
+  // Horizon
+  this.horizonLine = null;
+  this.horizonLines = [];
+  this.init();
+}
+
+
+/**
+ * Horizon config.
+ * @enum {number}
+ */
+Horizon.config = {
+  BG_CLOUD_SPEED: 0.2,
+  BUMPY_THRESHOLD: .3,
+  CLOUD_FREQUENCY: .5,
+  HORIZON_HEIGHT: 16,
+  MAX_CLOUDS: 6,
+};
+
+
+Horizon.prototype = {
+  /**
+   * Initialise the horizon. Just add the line and a cloud. No obstacles.
+   */
+  init() {
+    Obstacle.types = spriteDefinitionByType.original.OBSTACLES;
+    this.addCloud();
+    // Multiple Horizon lines
+    for (let i = 0; i < Runner.spriteDefinition.LINES.length; i++) {
+      this.horizonLines.push(
+          new HorizonLine(this.canvas, Runner.spriteDefinition.LINES[i]));
+    }
+
+    this.nightMode = new NightMode(this.canvas, this.spritePos.MOON,
+        this.dimensions.WIDTH);
+  },
+
+  /**
+   * Update obstacle definitions based on the speed of the game.
+   */
+  adjustObstacleSpeed: function() {
+    for (let i = 0; i < Obstacle.types.length; i++) {
+      if (Runner.slowDown) {
+        Obstacle.types[i].multipleSpeed = Obstacle.types[i].multipleSpeed / 2;
+        Obstacle.types[i].minGap *= 1.5;
+        Obstacle.types[i].minSpeed = Obstacle.types[i].minSpeed / 2;
+
+        // Convert variable y position obstacles to fixed.
+        if (typeof (Obstacle.types[i].yPos) == 'object') {
+          Obstacle.types[i].yPos = Obstacle.types[i].yPos[0];
+          Obstacle.types[i].yPosMobile = Obstacle.types[i].yPos[0];
+        }
+      }
+    }
+  },
+
+  /**
+   * Update sprites to correspond to change in sprite sheet.
+   * @param {number} spritePos
+   */
+  enableAltGameMode: function(spritePos) {
+    // Clear existing horizon objects.
+    this.clouds = [];
+    this.backgroundEls = [];
+
+    this.altGameModeActive = true;
+    this.spritePos = spritePos;
+
+    Obstacle.types = Runner.spriteDefinition.OBSTACLES;
+    this.adjustObstacleSpeed();
+
+    Obstacle.MAX_GAP_COEFFICIENT = Runner.spriteDefinition.MAX_GAP_COEFFICIENT;
+    Obstacle.MAX_OBSTACLE_LENGTH = Runner.spriteDefinition.MAX_OBSTACLE_LENGTH;
+
+    BackgroundEl.config = Runner.spriteDefinition.BACKGROUND_EL_CONFIG;
+
+    this.horizonLines = [];
+    for (let i = 0; i < Runner.spriteDefinition.LINES.length; i++) {
+      this.horizonLines.push(
+          new HorizonLine(this.canvas, Runner.spriteDefinition.LINES[i]));
+    }
+    this.reset();
+  },
+
+  /**
+   * @param {number} deltaTime
+   * @param {number} currentSpeed
+   * @param {boolean} updateObstacles Used as an override to prevent
+   *     the obstacles from being updated / added. This happens in the
+   *     ease in section.
+   * @param {boolean} showNightMode Night mode activated.
+   */
+  update(deltaTime, currentSpeed, updateObstacles, showNightMode) {
+    this.runningTime += deltaTime;
+
+    if (this.altGameModeActive) {
+      this.updateBackgroundEls(deltaTime, currentSpeed);
+    }
+
+    for (let i = 0; i < this.horizonLines.length; i++) {
+      this.horizonLines[i].update(deltaTime, currentSpeed);
+    }
+
+    if (!this.altGameModeActive || Runner.spriteDefinition.HAS_CLOUDS) {
+      this.nightMode.update(showNightMode);
+      this.updateClouds(deltaTime, currentSpeed);
+    }
+
+    if (updateObstacles) {
+      this.updateObstacles(deltaTime, currentSpeed);
+    }
+  },
+
+  /**
+   * Update background element positions. Also handles creating new elements.
+   * @param {number} elSpeed
+   * @param {Array<Object>} bgElArray
+   * @param {number} maxBgEl
+   * @param {Function} bgElAddFunction
+   * @param {number} frequency
+   */
+  updateBackgroundEl(elSpeed, bgElArray, maxBgEl, bgElAddFunction, frequency) {
+    const numElements = bgElArray.length;
+
+    if (numElements) {
+      for (let i = numElements - 1; i >= 0; i--) {
+        bgElArray[i].update(elSpeed);
+      }
+
+      const lastEl = bgElArray[numElements - 1];
+
+      // Check for adding a new element.
+      if (numElements < maxBgEl &&
+          (this.dimensions.WIDTH - lastEl.xPos) > lastEl.gap &&
+          frequency > Math.random()) {
+        bgElAddFunction();
+      }
+    } else {
+      bgElAddFunction();
+    }
+  },
+
+  /**
+   * Update the cloud positions.
+   * @param {number} deltaTime
+   * @param {number} speed
+   */
+  updateClouds(deltaTime, speed) {
+    const elSpeed = this.cloudSpeed / 1000 * deltaTime * speed;
+    this.updateBackgroundEl(
+        elSpeed, this.clouds, this.config.MAX_CLOUDS, this.addCloud.bind(this),
+        this.cloudFrequency);
+
+    // Remove expired elements.
+    this.clouds = this.clouds.filter((obj) => !obj.remove);
+  },
+
+  /**
+   * Update the background element positions.
+   * @param {number} deltaTime
+   * @param {number} speed
+   */
+  updateBackgroundEls(deltaTime, speed) {
+    this.updateBackgroundEl(
+        deltaTime, this.backgroundEls, BackgroundEl.config.MAX_BG_ELS,
+        this.addBackgroundEl.bind(this), this.cloudFrequency);
+
+    // Remove expired elements.
+    this.backgroundEls = this.backgroundEls.filter((obj) => !obj.remove);
+  },
+
+  /**
+   * Update the obstacle positions.
+   * @param {number} deltaTime
+   * @param {number} currentSpeed
+   */
+  updateObstacles(deltaTime, currentSpeed) {
+    const updatedObstacles = this.obstacles.slice(0);
+
+    for (let i = 0; i < this.obstacles.length; i++) {
+      const obstacle = this.obstacles[i];
+      obstacle.update(deltaTime, currentSpeed);
+
+      // Clean up existing obstacles.
+      if (obstacle.remove) {
+        updatedObstacles.shift();
+      }
+    }
+    this.obstacles = updatedObstacles;
+
+    if (this.obstacles.length > 0) {
+      const lastObstacle = this.obstacles[this.obstacles.length - 1];
+
+      if (lastObstacle && !lastObstacle.followingObstacleCreated &&
+          lastObstacle.isVisible() &&
+          (lastObstacle.xPos + lastObstacle.width + lastObstacle.gap) <
+          this.dimensions.WIDTH) {
+        this.addNewObstacle(currentSpeed);
+        lastObstacle.followingObstacleCreated = true;
+      }
+    } else {
+      // Create new obstacles.
+      this.addNewObstacle(currentSpeed);
+    }
+  },
+
+  removeFirstObstacle() {
+    this.obstacles.shift();
+  },
+
+  /**
+   * Add a new obstacle.
+   * @param {number} currentSpeed
+   */
+  addNewObstacle(currentSpeed) {
+    const obstacleCount =
+        Obstacle.types[Obstacle.types.length - 1].type != 'COLLECTABLE' ||
+            (Runner.isAltGameModeEnabled() && !this.altGameModeActive ||
+             this.altGameModeActive) ?
+        Obstacle.types.length - 1 :
+        Obstacle.types.length - 2;
+    const obstacleTypeIndex =
+        obstacleCount > 0 ? getRandomNum(0, obstacleCount) : 0;
+    const obstacleType = Obstacle.types[obstacleTypeIndex];
+
+    // Check for multiples of the same type of obstacle.
+    // Also check obstacle is available at current speed.
+    if ((obstacleCount > 0 && this.duplicateObstacleCheck(obstacleType.type)) ||
+        currentSpeed < obstacleType.minSpeed) {
+      this.addNewObstacle(currentSpeed);
+    } else {
+      const obstacleSpritePos = this.spritePos[obstacleType.type];
+
+      this.obstacles.push(new Obstacle(
+          this.canvasCtx, obstacleType, obstacleSpritePos, this.dimensions,
+          this.gapCoefficient, currentSpeed, obstacleType.width,
+          this.altGameModeActive));
+
+      this.obstacleHistory.unshift(obstacleType.type);
+
+      if (this.obstacleHistory.length > 1) {
+        this.obstacleHistory.splice(Runner.config.MAX_OBSTACLE_DUPLICATION);
+      }
+    }
+  },
+
+  /**
+   * Returns whether the previous two obstacles are the same as the next one.
+   * Maximum duplication is set in config value MAX_OBSTACLE_DUPLICATION.
+   * @return {boolean}
+   */
+  duplicateObstacleCheck(nextObstacleType) {
+    let duplicateCount = 0;
+
+    for (let i = 0; i < this.obstacleHistory.length; i++) {
+      duplicateCount =
+          this.obstacleHistory[i] === nextObstacleType ? duplicateCount + 1 : 0;
+    }
+    return duplicateCount >= Runner.config.MAX_OBSTACLE_DUPLICATION;
+  },
+
+  /**
+   * Reset the horizon layer.
+   * Remove existing obstacles and reposition the horizon line.
+   */
+  reset() {
+    this.obstacles = [];
+    for (let l = 0; l < this.horizonLines.length; l++) {
+      this.horizonLines[l].reset();
+    }
+
+    this.nightMode.reset();
+  },
+
+  /**
+   * Update the canvas width and scaling.
+   * @param {number} width Canvas width.
+   * @param {number} height Canvas height.
+   */
+  resize(width, height) {
+    this.canvas.width = width;
+    this.canvas.height = height;
+  },
+
+  /**
+   * Add a new cloud to the horizon.
+   */
+  addCloud() {
+    this.clouds.push(new Cloud(this.canvas, this.spritePos.CLOUD,
+        this.dimensions.WIDTH));
+  },
+
+  /**
+   * Add a random background element to the horizon.
+   */
+  addBackgroundEl() {
+    const backgroundElTypes =
+        Object.keys(Runner.spriteDefinition.BACKGROUND_EL);
+
+    if (backgroundElTypes.length > 0) {
+      let index = getRandomNum(0, backgroundElTypes.length - 1);
+      let type = backgroundElTypes[index];
+
+      // Add variation if available.
+      while (type == this.lastEl && backgroundElTypes.length > 1) {
+        index = getRandomNum(0, backgroundElTypes.length - 1);
+        type = backgroundElTypes[index];
+      }
+
+      this.lastEl = type;
+      this.backgroundEls.push(new BackgroundEl(
+          this.canvas, this.spritePos.BACKGROUND_EL, this.dimensions.WIDTH,
+          type));
+    }
+  },
+};
+
+// Copyright 2013 The Chromium Authors
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+
+function toggleHelpBox() {
+  const helpBoxOuter = document.getElementById('details');
+  helpBoxOuter.classList.toggle(HIDDEN_CLASS);
+  const detailsButton = document.getElementById('details-button');
+  if (helpBoxOuter.classList.contains(HIDDEN_CLASS)) {
+    /** @suppress {missingProperties} */
+    detailsButton.innerText = detailsButton.detailsText;
+  } else {
+    /** @suppress {missingProperties} */
+    detailsButton.innerText = detailsButton.hideDetailsText;
+  }
+
+  // Details appears over the main content on small screens.
+  if (mobileNav) {
+    document.getElementById('main-content').classList.toggle(HIDDEN_CLASS);
+    const runnerContainer = document.querySelector('.runner-container');
+    if (runnerContainer) {
+      runnerContainer.classList.toggle(HIDDEN_CLASS);
+    }
+  }
+}
+
+function diagnoseErrors() {
+  if (window.errorPageController) {
+    window.errorPageController.diagnoseErrorsButtonClick();
+  }
+}
+
+// Subframes use a different layout but the same html file.  This is to make it
+// easier to support platforms that load the error page via different
+// mechanisms (Currently just iOS).
+let isSubFrame = false;
+if (window.top.location !== window.location) {
+  document.documentElement.setAttribute('subframe', '');
+  isSubFrame = true;
+}
+
+// Re-renders the error page using |strings| as the dictionary of values.
+// Used by NetErrorTabHelper to update DNS error pages with probe results.
+function updateForDnsProbe(strings) {
+  const context = new JsEvalContext(strings);
+  jstProcess(context, document.body);
+  onDocumentLoadOrUpdate();
+}
+
+// Adds an icon class to the list and removes classes previously set.
+function updateIconClass(newClass) {
+  const frameSelector = isSubFrame ? '#sub-frame-error' : '#main-frame-error';
+  const iconEl = document.querySelector(frameSelector + ' .icon');
+
+  if (iconEl.classList.contains(newClass)) {
+    return;
+  }
+
+  iconEl.className = 'icon ' + newClass;
+}
+
+// Implements button clicks.  This function is needed during the transition
+// between implementing these in trunk chromium and implementing them in iOS.
+function reloadButtonClick(url) {
+  if (window.errorPageController) {
+    // 
+
+    // 
+    window.errorPageController.reloadButtonClick();
+    // 
+  } else {
+    window.location = url;
+  }
+}
+
+function downloadButtonClick() {
+  if (window.errorPageController) {
+    window.errorPageController.downloadButtonClick();
+    const downloadButton = document.getElementById('download-button');
+    downloadButton.disabled = true;
+    /** @suppress {missingProperties} */
+    downloadButton.textContent = downloadButton.disabledText;
+
+    document.getElementById('download-link-wrapper')
+        .classList.add(HIDDEN_CLASS);
+    document.getElementById('download-link-clicked-wrapper')
+        .classList.remove(HIDDEN_CLASS);
+  }
+}
+
+function detailsButtonClick() {
+  if (window.errorPageController) {
+    window.errorPageController.detailsButtonClick();
+  }
+}
+// clang-format off
+// 
+
+function setAutoFetchState(scheduled, can_schedule) {
+  document.getElementById('cancel-save-page-button')
+      .classList.toggle(HIDDEN_CLASS, !scheduled);
+  document.getElementById('save-page-for-later-button')
+      .classList.toggle(HIDDEN_CLASS, scheduled || !can_schedule);
+}
+
+function savePageLaterClick() {
+  window.errorPageController.savePageForLater();
+  // savePageForLater will eventually trigger a call to setAutoFetchState() when
+  // it completes.
+}
+
+function cancelSavePageClick() {
+  window.errorPageController.cancelSavePage();
+  // setAutoFetchState is not called in response to cancelSavePage(), so do it
+  // now.
+  setAutoFetchState(false, true);
+}
+
+function toggleErrorInformationPopup() {
+  document.getElementById('error-information-popup-container')
+      .classList.toggle(HIDDEN_CLASS);
+}
+
+function launchDownloadsPage() {
+  window.errorPageController.launchDownloadsPage();
+}
+
+function toggleOfflineContentListVisibility(updatePref) {
+  if (!loadTimeData.valueExists('offlineContentList')) {
+    return;
+  }
+
+  const contentListElement = document.getElementById('offline-content-list');
+  const isVisible = !contentListElement.classList.toggle('list-hidden');
+
+  if (updatePref && window.errorPageController) {
+    window.errorPageController.listVisibilityChanged(isVisible);
+  }
+}
+
+// Called on document load, and from updateForDnsProbe().
+function onDocumentLoadOrUpdate() {
+  const downloadButtonVisible = loadTimeData.valueExists('downloadButton') &&
+      loadTimeData.getValue('downloadButton').msg;
+  const detailsButton = document.getElementById('details-button');
+
+  // If offline content suggestions will be visible, the usual buttons will not
+  // be presented.
+  const offlineContentVisible =
+      loadTimeData.valueExists('suggestedOfflineContentPresentation');
+  if (offlineContentVisible) {
+    document.querySelector('.nav-wrapper').classList.add(HIDDEN_CLASS);
+    detailsButton.classList.add(HIDDEN_CLASS);
+
+    document.getElementById('download-link').hidden = !downloadButtonVisible;
+    document.getElementById('download-links-wrapper')
+        .classList.remove(HIDDEN_CLASS);
+    document.getElementById('error-information-popup-container')
+        .classList.add('use-popup-container', HIDDEN_CLASS);
+    document.getElementById('error-information-button')
+        .classList.remove(HIDDEN_CLASS);
+  }
+
+  loadTimeData.valueExists('attemptAutoFetch') &&
+      loadTimeData.getValue('attemptAutoFetch');
+
+  const reloadButtonVisible = loadTimeData.valueExists('reloadButton') &&
+      loadTimeData.getValue('reloadButton').msg;
+
+  const reloadButton = document.getElementById('reload-button');
+  const downloadButton = document.getElementById('download-button');
+  if (reloadButton.style.display === 'none' &&
+      downloadButton.style.display === 'none') {
+    detailsButton.classList.add('singular');
+  }
+
+  // Show or hide control buttons.
+  const controlButtonDiv = document.getElementById('control-buttons');
+  controlButtonDiv.hidden =
+      offlineContentVisible || !(reloadButtonVisible || downloadButtonVisible);
+
+  const iconClass = loadTimeData.valueExists('iconClass') &&
+      loadTimeData.getValue('iconClass');
+
+  updateIconClass(iconClass);
+
+  if (!isSubFrame && iconClass === 'icon-offline') {
+    document.documentElement.classList.add('offline');
+    new Runner('.interstitial-wrapper');
+  }
+}
+
+function onDocumentLoad() {
+  // `loadTimeDataRaw` is injected to the `window` scope from C++.
+  loadTimeData.data = window.loadTimeDataRaw;
+  jstProcess(new JsEvalContext(window.loadTimeDataRaw), document.body);
+
+  // Sets up the proper button layout for the current platform.
+  const buttonsDiv = document.getElementById('buttons');
+  {
+    buttonsDiv.classList.add('suggested-left');
+  }
+
+  onDocumentLoadOrUpdate();
+}
+
+// Expose methods that are triggered either
+//  - By `onclick=...` handlers in the HTML code, OR
+//  - By `href="javascript:..."` in localized links.
+//  - By inected JS code coming from C++
+//
+//  since those need to be available on the 'window' object.
+Object.assign(window, {
+  cancelSavePageClick,
+  detailsButtonClick,
+  diagnoseErrors,
+  downloadButtonClick,
+  launchDownloadsPage,
+  reloadButtonClick,
+  savePageLaterClick,
+  toggleErrorInformationPopup,
+  toggleHelpBox,
+  toggleOfflineContentListVisibility,
+  updateForDnsProbe,
+});
+
+document.addEventListener('DOMContentLoaded', onDocumentLoad);
+//# sourceMappingURL=neterror.rollup.js.map
+</script>
+</head>
+<body class="neterror" style="font-family: &#39;Segoe UI&#39;, Tahoma, sans-serif; font-size: 75%" jstcache="0">
+  <div id="main-frame-error" class="interstitial-wrapper" jstcache="0">
+    <div id="main-content" jstcache="0">
+      <div class="icon" jstcache="0"></div>
+      <div id="main-message" jstcache="0">
+        <h1 jstcache="0">
+          <span jsselect="heading" jsvalues=".innerHTML:msg" jstcache="9"><span jscontent="hostName" jstcache="22">td.doubleclick.net</span> is blocked</span>
+          <a id="error-information-button" class="hidden" onclick="toggleErrorInformationPopup();" jstcache="0"></a>
+        </h1>
+        <p jsselect="summary" jsvalues=".innerHTML:msg" jstcache="1">This content is blocked. Contact the site owner to fix the issue.</p>
+        <!--The suggestion list and error code are normally presented inline,
+          in which case error-information-popup-* divs have no effect. When
+          error-information-popup-container has the use-popup-container class, this
+          information is provided in a popup instead.-->
+        <div id="error-information-popup-container" jstcache="0">
+          <div id="error-information-popup" jstcache="0">
+            <div id="error-information-popup-box" jstcache="0">
+              <div id="error-information-popup-content" jstcache="0">
+                <div id="suggestions-list" style="display:none" jsdisplay="(suggestionsSummaryList &amp;&amp; suggestionsSummaryList.length)" jstcache="16">
+                  <p jsvalues=".innerHTML:suggestionsSummaryListHeader" jstcache="18"></p>
+                  <ul jsvalues=".className:suggestionsSummaryList.length == 1 ? &#39;single-suggestion&#39; : &#39;&#39;" jstcache="19">
+                    <li jsselect="suggestionsSummaryList" jsvalues=".innerHTML:summary" jstcache="21"></li>
+                  </ul>
+                </div>
+                <div class="error-code" jscontent="errorCode" jstcache="17">ERR_BLOCKED_BY_CSP</div>
+                <p id="error-information-popup-close" jstcache="0">
+                  <a class="link-button" jscontent="closeDescriptionPopup" onclick="toggleErrorInformationPopup();" jstcache="20">null</a>
+                </p>
+              </div>
+            </div>
+          </div>
+        </div>
+        <div id="download-links-wrapper" class="hidden" jstcache="0">
+          <div id="download-link-wrapper" jstcache="0">
+            <a id="download-link" class="link-button" onclick="downloadButtonClick()" jsselect="downloadButton" jscontent="msg" jsvalues=".disabledText:disabledMsg" jstcache="6" style="display: none;">
+            </a>
+          </div>
+          <div id="download-link-clicked-wrapper" class="hidden" jstcache="0">
+            <div id="download-link-clicked" class="link-button" jsselect="downloadButton" jscontent="disabledMsg" jstcache="11" style="display: none;">
+            </div>
+          </div>
+        </div>
+        <div id="save-page-for-later-button" class="hidden" jstcache="0">
+          <a class="link-button" onclick="savePageLaterClick()" jsselect="savePageLater" jscontent="savePageMsg" jstcache="10" style="display: none;">
+          </a>
+        </div>
+        <div id="cancel-save-page-button" class="hidden" onclick="cancelSavePageClick()" jsselect="savePageLater" jsvalues=".innerHTML:cancelMsg" jstcache="4" style="display: none;">
+        </div>
+        <div id="offline-content-list" class="list-hidden" hidden="" jstcache="0">
+          <div id="offline-content-list-visibility-card" onclick="toggleOfflineContentListVisibility(true)" jstcache="0">
+            <div id="offline-content-list-title" jsselect="offlineContentList" jscontent="title" jstcache="12" style="display: none;">
+            </div>
+            <div jstcache="0">
+              <div id="offline-content-list-show-text" jsselect="offlineContentList" jscontent="showText" jstcache="14" style="display: none;">
+              </div>
+              <div id="offline-content-list-hide-text" jsselect="offlineContentList" jscontent="hideText" jstcache="15" style="display: none;">
+              </div>
+            </div>
+          </div>
+          <div id="offline-content-suggestions" jstcache="0"></div>
+          <div id="offline-content-list-action" jstcache="0">
+            <a class="link-button" onclick="launchDownloadsPage()" jsselect="offlineContentList" jscontent="actionText" jstcache="13" style="display: none;">
+            </a>
+          </div>
+        </div>
+      </div>
+    </div>
+    <div id="buttons" class="nav-wrapper suggested-left" jstcache="0">
+      <div id="control-buttons" hidden="" jstcache="0">
+        <button id="reload-button" class="blue-button text-button" onclick="reloadButtonClick(this.url);" jsselect="reloadButton" jsvalues=".url:reloadUrl" jscontent="msg" jstcache="5" style="display: none;"></button>
+        <button id="download-button" class="blue-button text-button" onclick="downloadButtonClick()" jsselect="downloadButton" jscontent="msg" jsvalues=".disabledText:disabledMsg" jstcache="6" style="display: none;">
+        </button>
+      </div>
+      <button id="details-button" class="secondary-button text-button small-link singular" onclick="detailsButtonClick(); toggleHelpBox()" jscontent="details" jsdisplay="(suggestionsDetails &amp;&amp; suggestionsDetails.length &gt; 0) || diagnose" jsvalues=".detailsText:details; .hideDetailsText:hideDetails;" jstcache="2" style="display: none;"></button>
+    </div>
+    <div id="details" class="hidden" jstcache="0">
+      <div class="suggestions" jsselect="suggestionsDetails" jstcache="3" jsinstance="*0" style="display: none;">
+        <div class="suggestion-header" jsvalues=".innerHTML:header" jstcache="7"></div>
+        <div class="suggestion-body" jsvalues=".innerHTML:body" jstcache="8"></div>
+      </div>
+    </div>
+  </div>
+  <div id="sub-frame-error" jstcache="0">
+    <!-- Show details when hovering over the icon, in case the details are
+         hidden because they're too large. -->
+    <div class="icon icon-generic" jstcache="0"></div>
+    <div id="sub-frame-error-details" jsselect="summary" jsvalues=".innerHTML:msg" jstcache="1">This content is blocked. Contact the site owner to fix the issue.</div>
+  </div>
+
+  <div id="offline-resources" jstcache="0">
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+
+
+<script jstcache="0">var loadTimeDataRaw = {"details":"Details","errorCode":"ERR_BLOCKED_BY_CSP","fontfamily":"'Segoe UI', Tahoma, sans-serif","fontfamilyMd":"'Segoe UI', Tahoma, sans-serif","fontsize":"75%","heading":{"hostName":"td.doubleclick.net","msg":"\u003Cspan jscontent=\"hostName\">\u003C/span> is blocked"},"hideDetails":"Hide details","iconClass":"icon-generic","language":"en","suggestionsDetails":[],"suggestionsSummaryList":[],"summary":{"failedUrl":"https://td.doubleclick.net/td/rul/654613002?random=1713704512647&cv=11&fst=1713704512647&fmt=3&bg=ffffff&guid=ON&async=1&gtm=45be44h0v9179586716za200&gcd=13l3l3l3l1&dma=0&u_w=1536&u_h=864&url=https%3A%2F%2Fdashboard.workos.com%2Fenvironment_01HW0B51Y5DVM09Q10FCPJK811%2Fonboarding%2Fuser-management&hn=www.googleadservices.com&frm=0&tiba=User%20management%20onboarding%20%7C%20WorkOS&npa=0&pscdl=noapi&auid=796908348.1713703616&uaa=x86&uab=64&uafvl=Chromium%3B124.0.6367.60%7CGoogle%2520Chrome%3B124.0.6367.60%7CNot-A.Brand%3B99.0.0.0&uamb=0&uam=&uap=Windows&uapv=15.0.0&uaw=0&fledge=1&data=event%3Dform_submit","hostName":"td.doubleclick.net","msg":"This content is blocked. Contact the site owner to fix the issue."},"textdirection":"ltr","title":"td.doubleclick.net"};</script></body></html>
\ No newline at end of file

From 5bd6dd226517cafbe921be4acd19b09c9c1a7263 Mon Sep 17 00:00:00 2001
From: Romeo Rosete <110788242+bombastictranz@users.noreply.github.com>
Date: Wed, 24 Apr 2024 07:47:43 -0400
Subject: [PATCH 3/3] 654613002(3).html

Stock control supervisors
---
 654613002(3).html | 6809 +++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 6809 insertions(+)
 create mode 100644 654613002(3).html

diff --git a/654613002(3).html b/654613002(3).html
new file mode 100644
index 0000000000..04f7553380
--- /dev/null
+++ b/654613002(3).html
@@ -0,0 +1,6809 @@
+<!DOCTYPE html>
+<!-- saved from url=(0029)chrome-error://chromewebdata/ -->
+<html dir="ltr" lang="en" subframe=""><head><meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
+  
+  <meta name="color-scheme" content="light dark">
+  <meta name="theme-color" content="#fff">
+  <meta name="viewport" content="width=device-width, initial-scale=1.0,
+                                 maximum-scale=1.0, user-scalable=no">
+  <title>td.doubleclick.net</title>
+  <style>/* Copyright 2017 The Chromium Authors
+ * Use of this source code is governed by a BSD-style license that can be
+ * found in the LICENSE file. */
+
+a {
+  color: var(--link-color);
+}
+
+body {
+  --background-color: #fff;
+  --error-code-color: var(--google-gray-700);
+  --google-blue-100: rgb(210, 227, 252);
+  --google-blue-300: rgb(138, 180, 248);
+  --google-blue-600: rgb(26, 115, 232);
+  --google-blue-700: rgb(25, 103, 210);
+  --google-gray-100: rgb(241, 243, 244);
+  --google-gray-300: rgb(218, 220, 224);
+  --google-gray-500: rgb(154, 160, 166);
+  --google-gray-50: rgb(248, 249, 250);
+  --google-gray-600: rgb(128, 134, 139);
+  --google-gray-700: rgb(95, 99, 104);
+  --google-gray-800: rgb(60, 64, 67);
+  --google-gray-900: rgb(32, 33, 36);
+  --heading-color: var(--google-gray-900);
+  --link-color: rgb(88, 88, 88);
+  --popup-container-background-color: rgba(0,0,0,.65);
+  --primary-button-fill-color-active: var(--google-blue-700);
+  --primary-button-fill-color: var(--google-blue-600);
+  --primary-button-text-color: #fff;
+  --quiet-background-color: rgb(247, 247, 247);
+  --secondary-button-border-color: var(--google-gray-500);
+  --secondary-button-fill-color: #fff;
+  --secondary-button-hover-border-color: var(--google-gray-600);
+  --secondary-button-hover-fill-color: var(--google-gray-50);
+  --secondary-button-text-color: var(--google-gray-700);
+  --small-link-color: var(--google-gray-700);
+  --text-color: var(--google-gray-700);
+  background: var(--background-color);
+  color: var(--text-color);
+  word-wrap: break-word;
+}
+
+.nav-wrapper .secondary-button {
+  background: var(--secondary-button-fill-color);
+  border: 1px solid var(--secondary-button-border-color);
+  color: var(--secondary-button-text-color);
+  float: none;
+  margin: 0;
+  padding: 8px 16px;
+}
+
+.hidden {
+  display: none;
+}
+
+html {
+  -webkit-text-size-adjust: 100%;
+  font-size: 125%;
+}
+
+.icon {
+  background-repeat: no-repeat;
+  background-size: 100%;
+}
+
+@media (prefers-color-scheme: dark) {
+  body {
+    --background-color: var(--google-gray-900);
+    --error-code-color: var(--google-gray-500);
+    --heading-color: var(--google-gray-500);
+    --link-color: var(--google-blue-300);
+    --primary-button-fill-color-active: rgb(129, 162, 208);
+    --primary-button-fill-color: var(--google-blue-300);
+    --primary-button-text-color: var(--google-gray-900);
+    --quiet-background-color: var(--background-color);
+    --secondary-button-border-color: var(--google-gray-700);
+    --secondary-button-fill-color: var(--google-gray-900);
+    --secondary-button-hover-fill-color: rgb(48, 51, 57);
+    --secondary-button-text-color: var(--google-blue-300);
+    --small-link-color: var(--google-blue-300);
+    --text-color: var(--google-gray-500);
+  }
+}
+</style>
+  <style>/* Copyright 2014 The Chromium Authors
+   Use of this source code is governed by a BSD-style license that can be
+   found in the LICENSE file. */
+
+button {
+  border: 0;
+  border-radius: 20px;
+  box-sizing: border-box;
+  color: var(--primary-button-text-color);
+  cursor: pointer;
+  float: right;
+  font-size: .875em;
+  margin: 0;
+  padding: 8px 16px;
+  transition: box-shadow 150ms cubic-bezier(0.4, 0, 0.2, 1);
+  user-select: none;
+}
+
+[dir='rtl'] button {
+  float: left;
+}
+
+.bad-clock button,
+.captive-portal button,
+.https-only button,
+.insecure-form button,
+.lookalike-url button,
+.main-frame-blocked button,
+.neterror button,
+.pdf button,
+.ssl button,
+.enterprise-block button,
+.enterprise-warn button,
+.safe-browsing-billing button {
+  background: var(--primary-button-fill-color);
+}
+
+button:active {
+  background: var(--primary-button-fill-color-active);
+  outline: 0;
+}
+
+#debugging {
+  display: inline;
+  overflow: auto;
+}
+
+.debugging-content {
+  line-height: 1em;
+  margin-bottom: 0;
+  margin-top: 1em;
+}
+
+.debugging-content-fixed-width {
+  display: block;
+  font-family: monospace;
+  font-size: 1.2em;
+  margin-top: 0.5em;
+}
+
+.debugging-title {
+  font-weight: bold;
+}
+
+#details {
+  margin: 0 0 50px;
+}
+
+#details p:not(:first-of-type) {
+  margin-top: 20px;
+}
+
+.secondary-button:active {
+  border-color: white;
+  box-shadow: 0 1px 2px 0 rgba(60, 64, 67, .3),
+      0 2px 6px 2px rgba(60, 64, 67, .15);
+}
+
+.secondary-button:hover {
+  background: var(--secondary-button-hover-fill-color);
+  border-color: var(--secondary-button-hover-border-color);
+  text-decoration: none;
+}
+
+.error-code {
+  color: var(--error-code-color);
+  font-size: .8em;
+  margin-top: 12px;
+  text-transform: uppercase;
+}
+
+#error-debugging-info {
+  font-size: 0.8em;
+}
+
+h1 {
+  color: var(--heading-color);
+  font-size: 1.6em;
+  font-weight: normal;
+  line-height: 1.25em;
+  margin-bottom: 16px;
+}
+
+h2 {
+  font-size: 1.2em;
+  font-weight: normal;
+}
+
+.icon {
+  height: 72px;
+  margin: 0 0 40px;
+  width: 72px;
+}
+
+input[type=checkbox] {
+  opacity: 0;
+}
+
+input[type=checkbox]:focus ~ .checkbox::after {
+  outline: -webkit-focus-ring-color auto 5px;
+}
+
+.interstitial-wrapper {
+  box-sizing: border-box;
+  font-size: 1em;
+  line-height: 1.6em;
+  margin: 14vh auto 0;
+  max-width: 600px;
+  width: 100%;
+}
+
+#main-message > p {
+  display: inline;
+}
+
+#extended-reporting-opt-in {
+  font-size: .875em;
+  margin-top: 32px;
+}
+
+#extended-reporting-opt-in label {
+  display: grid;
+  grid-template-columns: 1.8em 1fr;
+  position: relative;
+}
+
+#enhanced-protection-message {
+  border-radius: 20px;
+  font-size: 1em;
+  margin-top: 32px;
+  padding: 10px 5px;
+}
+
+#enhanced-protection-message a {
+  color: var(--google-red-10);
+}
+
+#enhanced-protection-message label {
+  display: grid;
+  grid-template-columns: 2.5em 1fr;
+  position: relative;
+}
+
+#enhanced-protection-message div {
+  margin: 0.5em;
+}
+
+#enhanced-protection-message .icon {
+  height: 1.5em;
+  vertical-align: middle;
+  width: 1.5em;
+}
+
+.nav-wrapper {
+  margin-top: 51px;
+}
+
+.nav-wrapper::after {
+  clear: both;
+  content: '';
+  display: table;
+  width: 100%;
+}
+
+.small-link {
+  color: var(--small-link-color);
+  font-size: .875em;
+}
+
+.checkboxes {
+  flex: 0 0 24px;
+}
+
+.checkbox {
+  --padding: .9em;
+  background: transparent;
+  display: block;
+  height: 1em;
+  left: -1em;
+  padding-inline-start: var(--padding);
+  position: absolute;
+  right: 0;
+  top: -.5em;
+  width: 1em;
+}
+
+.checkbox::after {
+  border: 1px solid white;
+  border-radius: 2px;
+  content: '';
+  height: 1em;
+  left: var(--padding);
+  position: absolute;
+  top: var(--padding);
+  width: 1em;
+}
+
+.checkbox::before {
+  background: transparent;
+  border: 2px solid white;
+  border-inline-end-width: 0;
+  border-top-width: 0;
+  content: '';
+  height: .2em;
+  left: calc(.3em + var(--padding));
+  opacity: 0;
+  position: absolute;
+  top: calc(.3em  + var(--padding));
+  transform: rotate(-45deg);
+  width: .5em;
+}
+
+input[type=checkbox]:checked ~ .checkbox::before {
+  opacity: 1;
+}
+
+#recurrent-error-message {
+  background: #ededed;
+  border-radius: 4px;
+  margin-bottom: 16px;
+  margin-top: 12px;
+  padding: 12px 16px;
+}
+
+.showing-recurrent-error-message #extended-reporting-opt-in {
+  margin-top: 16px;
+}
+
+.showing-recurrent-error-message #enhanced-protection-message {
+  margin-top: 16px;
+}
+
+@media (max-width: 700px) {
+  .interstitial-wrapper {
+    padding: 0 10%;
+  }
+
+  #error-debugging-info {
+    overflow: auto;
+  }
+}
+
+@media (max-width: 420px) {
+  button,
+  [dir='rtl'] button,
+  .small-link {
+    float: none;
+    font-size: .825em;
+    font-weight: 500;
+    margin: 0;
+    width: 100%;
+  }
+
+  button {
+    padding: 16px 24px;
+  }
+
+  #details {
+    margin: 20px 0 20px 0;
+  }
+
+  #details p:not(:first-of-type) {
+    margin-top: 10px;
+  }
+
+  .secondary-button:not(.hidden) {
+    display: block;
+    margin-top: 20px;
+    text-align: center;
+    width: 100%;
+  }
+
+  .interstitial-wrapper {
+    padding: 0 5%;
+  }
+
+  #extended-reporting-opt-in {
+    margin-top: 24px;
+  }
+
+  #enhanced-protection-message {
+    margin-top: 24px;
+  }
+
+  .nav-wrapper {
+    margin-top: 30px;
+  }
+}
+
+/**
+ * Mobile specific styling.
+ * Navigation buttons are anchored to the bottom of the screen.
+ * Details message replaces the top content in its own scrollable area.
+ */
+
+@media (max-width: 420px) {
+  .nav-wrapper .secondary-button {
+    border: 0;
+    margin: 16px 0 0;
+    margin-inline-end: 0;
+    padding-bottom: 16px;
+    padding-top: 16px;
+  }
+}
+
+/* Fixed nav. */
+@media (min-width: 240px) and (max-width: 420px) and
+       (min-height: 401px),
+       (min-width: 421px) and (min-height: 240px) and
+       (max-height: 560px) {
+  body .nav-wrapper {
+    background: var(--background-color);
+    bottom: 0;
+    box-shadow: 0 -12px 24px var(--background-color);
+    left: 0;
+    margin: 0 auto;
+    max-width: 736px;
+    padding-inline-end: 24px;
+    padding-inline-start: 24px;
+    position: fixed;
+    right: 0;
+    width: 100%;
+    z-index: 2;
+  }
+
+  .interstitial-wrapper {
+    max-width: 736px;
+  }
+
+  #details,
+  #main-content {
+    padding-bottom: 40px;
+  }
+
+  #details {
+    padding-top: 5.5vh;
+  }
+
+  button.small-link {
+    color: var(--google-blue-600);
+  }
+}
+
+@media (max-width: 420px) and (orientation: portrait),
+       (max-height: 560px) {
+  body {
+    margin: 0 auto;
+  }
+
+  button,
+  [dir='rtl'] button,
+  button.small-link,
+  .nav-wrapper .secondary-button {
+    font-family: Roboto-Regular,Helvetica;
+    font-size: .933em;
+    margin: 6px 0;
+    transform: translatez(0);
+  }
+
+  .nav-wrapper {
+    box-sizing: border-box;
+    padding-bottom: 8px;
+    width: 100%;
+  }
+
+  #details {
+    box-sizing: border-box;
+    height: auto;
+    margin: 0;
+    opacity: 1;
+    transition: opacity 250ms cubic-bezier(0.4, 0, 0.2, 1);
+  }
+
+  #details.hidden,
+  #main-content.hidden {
+    height: 0;
+    opacity: 0;
+    overflow: hidden;
+    padding-bottom: 0;
+    transition: none;
+  }
+
+  h1 {
+    font-size: 1.5em;
+    margin-bottom: 8px;
+  }
+
+  .icon {
+    margin-bottom: 5.69vh;
+  }
+
+  .interstitial-wrapper {
+    box-sizing: border-box;
+    margin: 7vh auto 12px;
+    padding: 0 24px;
+    position: relative;
+  }
+
+  .interstitial-wrapper p {
+    font-size: .95em;
+    line-height: 1.61em;
+    margin-top: 8px;
+  }
+
+  #main-content {
+    margin: 0;
+    transition: opacity 100ms cubic-bezier(0.4, 0, 0.2, 1);
+  }
+
+  .small-link {
+    border: 0;
+  }
+
+  .suggested-left > #control-buttons,
+  .suggested-right > #control-buttons {
+    float: none;
+    margin: 0;
+  }
+}
+
+@media (min-width: 421px) and (min-height: 500px) and (max-height: 560px) {
+  .interstitial-wrapper {
+    margin-top: 10vh;
+  }
+}
+
+@media (min-height: 400px) and (orientation:portrait) {
+  .interstitial-wrapper {
+    margin-bottom: 145px;
+  }
+}
+
+@media (min-height: 299px) {
+  .nav-wrapper {
+    padding-bottom: 16px;
+  }
+}
+
+@media (max-height: 560px) and (min-height: 240px) and (orientation:landscape) {
+  .extended-reporting-has-checkbox #details {
+    padding-bottom: 80px;
+  }
+}
+
+@media (min-height: 500px) and (max-height: 650px) and (max-width: 414px) and
+       (orientation: portrait) {
+  .interstitial-wrapper {
+    margin-top: 7vh;
+  }
+}
+
+@media (min-height: 650px) and (max-width: 414px) and (orientation: portrait) {
+  .interstitial-wrapper {
+    margin-top: 10vh;
+  }
+}
+
+/* Small mobile screens. No fixed nav. */
+@media (max-height: 400px) and (orientation: portrait),
+       (max-height: 239px) and (orientation: landscape),
+       (max-width: 419px) and (max-height: 399px) {
+  .interstitial-wrapper {
+    display: flex;
+    flex-direction: column;
+    margin-bottom: 0;
+  }
+
+  #details {
+    flex: 1 1 auto;
+    order: 0;
+  }
+
+  #main-content {
+    flex: 1 1 auto;
+    order: 0;
+  }
+
+  .nav-wrapper {
+    flex: 0 1 auto;
+    margin-top: 8px;
+    order: 1;
+    padding-inline-end: 0;
+    padding-inline-start: 0;
+    position: relative;
+    width: 100%;
+  }
+
+  button,
+  .nav-wrapper .secondary-button {
+    padding: 16px 24px;
+  }
+
+  button.small-link {
+    color: var(--google-blue-600);
+  }
+}
+
+@media (max-width: 239px) and (orientation: portrait) {
+  .nav-wrapper {
+    padding-inline-end: 0;
+    padding-inline-start: 0;
+  }
+}
+</style>
+  <style>/* Copyright 2013 The Chromium Authors
+ * Use of this source code is governed by a BSD-style license that can be
+ * found in the LICENSE file. */
+
+/* Don't use the main frame div when the error is in a subframe. */
+html[subframe] #main-frame-error {
+  display: none;
+}
+
+/* Don't use the subframe error div when the error is in a main frame. */
+html:not([subframe]) #sub-frame-error {
+  display: none;
+}
+
+h1 {
+  margin-top: 0;
+  word-wrap: break-word;
+}
+
+h1 span {
+  font-weight: 500;
+}
+
+a {
+  text-decoration: none;
+}
+
+.icon {
+  -webkit-user-select: none;
+  display: inline-block;
+}
+
+.icon-generic {
+  /* Can't access chrome://theme/IDR_ERROR_NETWORK_GENERIC from an untrusted
+   * renderer process, so embed the resource manually. */
+  content: image-set(
+      url(data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAEgAAABIAQMAAABvIyEEAAAABlBMVEUAAABTU1OoaSf/AAAAAXRSTlMAQObYZgAAAENJREFUeF7tzbEJACEQRNGBLeAasBCza2lLEGx0CxFGG9hBMDDxRy/72O9FMnIFapGylsu1fgoBdkXfUHLrQgdfrlJN1BdYBjQQm3UAAAAASUVORK5CYII=) 1x,
+      url(data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAJAAAACQAQMAAADdiHD7AAAABlBMVEUAAABTU1OoaSf/AAAAAXRSTlMAQObYZgAAAFJJREFUeF7t0cENgDAMQ9FwYgxG6WjpaIzCCAxQxVggFuDiCvlLOeRdHR9yzjncHVoq3npu+wQUrUuJHylSTmBaespJyJQoObUeyxDQb3bEm5Au81c0pSCD8HYAAAAASUVORK5CYII=) 2x);
+}
+
+.icon-info {
+  content: image-set(
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+
+#suggestions-list a {
+  color: var(--google-blue-600);
+}
+
+#suggestions-list p {
+  margin-block-end: 0;
+}
+
+#suggestions-list ul {
+  margin-top: 0;
+}
+
+.single-suggestion {
+  list-style-type: none;
+  padding-inline-start: 0;
+}
+
+#error-information-button {
+  content: url(data:image/svg+xml;base64,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);
+  height: 24px;
+  vertical-align: -.15em;
+  width: 24px;
+}
+
+.use-popup-container#error-information-popup-container
+  #error-information-popup {
+  align-items: center;
+  background-color: var(--popup-container-background-color);
+  display: flex;
+  height: 100%;
+  left: 0;
+  position: fixed;
+  top: 0;
+  width: 100%;
+  z-index: 100;
+}
+
+.use-popup-container#error-information-popup-container
+  #error-information-popup-content > p {
+  margin-bottom: 11px;
+  margin-inline-start: 20px;
+}
+
+.use-popup-container#error-information-popup-container #suggestions-list ul {
+  margin-inline-start: 15px;
+}
+
+.use-popup-container#error-information-popup-container
+  #error-information-popup-box {
+  background-color: var(--background-color);
+  left: 5%;
+  padding-bottom: 15px;
+  padding-top: 15px;
+  position: fixed;
+  width: 90%;
+  z-index: 101;
+}
+
+.use-popup-container#error-information-popup-container div.error-code {
+  margin-inline-start: 20px;
+}
+
+.use-popup-container#error-information-popup-container #suggestions-list p {
+  margin-inline-start: 20px;
+}
+
+:not(.use-popup-container)#error-information-popup-container
+  #error-information-popup-close {
+  display: none;
+}
+
+#error-information-popup-close {
+  margin-bottom: 0;
+  margin-inline-end: 35px;
+  margin-top: 15px;
+  text-align: end;
+}
+
+.link-button {
+  color: rgb(66, 133, 244);
+  display: inline-block;
+  font-weight: bold;
+  text-transform: uppercase;
+}
+
+#sub-frame-error-details {
+
+  color: #8F8F8F;
+
+  /* Not done on mobile for performance reasons. */
+  text-shadow: 0 1px 0 rgba(255,255,255,0.3);
+
+}
+
+[jscontent=hostName],
+[jscontent=failedUrl] {
+  overflow-wrap: break-word;
+}
+
+.secondary-button {
+  background: #d9d9d9;
+  color: #696969;
+  margin-inline-end: 16px;
+}
+
+.snackbar {
+  background: #323232;
+  border-radius: 2px;
+  bottom: 24px;
+  box-sizing: border-box;
+  color: #fff;
+  font-size: .87em;
+  left: 24px;
+  max-width: 568px;
+  min-width: 288px;
+  opacity: 0;
+  padding: 16px 24px 12px;
+  position: fixed;
+  transform: translateY(90px);
+  will-change: opacity, transform;
+  z-index: 999;
+}
+
+.snackbar-show {
+  -webkit-animation:
+    show-snackbar 250ms cubic-bezier(0, 0, 0.2, 1) forwards,
+    hide-snackbar 250ms cubic-bezier(0.4, 0, 1, 1) forwards 5s;
+}
+
+@-webkit-keyframes show-snackbar {
+  100% {
+    opacity: 1;
+    transform: translateY(0);
+  }
+}
+
+@-webkit-keyframes hide-snackbar {
+  0% {
+    opacity: 1;
+    transform: translateY(0);
+  }
+  100% {
+    opacity: 0;
+    transform: translateY(90px);
+  }
+}
+
+.suggestions {
+  margin-top: 18px;
+}
+
+.suggestion-header {
+  font-weight: bold;
+  margin-bottom: 4px;
+}
+
+.suggestion-body {
+  color: #777;
+}
+
+/* Decrease padding at low sizes. */
+@media (max-width: 640px), (max-height: 640px) {
+  h1 {
+    margin: 0 0 15px;
+  }
+  .suggestions {
+    margin-top: 10px;
+  }
+  .suggestion-header {
+    margin-bottom: 0;
+  }
+}
+
+#download-link,
+#download-link-clicked {
+  margin-bottom: 30px;
+  margin-top: 30px;
+}
+
+#download-link-clicked {
+  color: #BBB;
+}
+
+#download-link::before,
+#download-link-clicked::before {
+  content: url(data:image/svg+xml;base64,PHN2ZyB4bWxucz0iaHR0cDovL3d3dy53My5vcmcvMjAwMC9zdmciIHdpZHRoPSIxLjJlbSIgaGVpZ2h0PSIxLjJlbSIgdmlld0JveD0iMCAwIDI0IDI0Ij48cGF0aCBkPSJNNSAyMGgxNHYtMkg1bTE0LTloLTRWM0g5djZINWw3IDcgNy03eiIgZmlsbD0iIzQyODVGNCIvPjwvc3ZnPg==);
+  display: inline-block;
+  margin-inline-end: 4px;
+  vertical-align: -webkit-baseline-middle;
+}
+
+#download-link-clicked::before {
+  opacity: 0;
+  width: 0;
+}
+
+#offline-content-list-visibility-card {
+  border: 1px solid white;
+  border-radius: 8px;
+  display: flex;
+  font-size: .8em;
+  justify-content: space-between;
+  line-height: 1;
+}
+
+#offline-content-list.list-hidden #offline-content-list-visibility-card {
+  border-color: rgb(218, 220, 224);
+}
+
+#offline-content-list-visibility-card > div {
+  padding: 1em;
+}
+
+#offline-content-list-title {
+  color: var(--google-gray-700);
+}
+
+#offline-content-list-show-text,
+#offline-content-list-hide-text {
+  color: rgb(66, 133, 244);
+}
+
+/* Hides the "hide" text div when the offline content list is collapsed/hidden
+ * and, alternatively, hides the "show" text div when the offline content list
+ * is expanded/shown.
+ */
+#offline-content-list.list-hidden #offline-content-list-hide-text,
+#offline-content-list:not(.list-hidden) #offline-content-list-show-text {
+  display: none;
+}
+
+/* Controls the animation of the offline content list when it is expanded/shown.
+ */
+#offline-content-suggestions {
+  /* Max-height has to be set for the height animation to work. The chosen value
+   * is a little greater than the maximum height the list will have, when all
+   * suggestions have images, so that it is never clamped. This makes so that
+   * when the actual height is smaller then the animation is not as smooth.
+   */
+  max-height: 27em;
+  transition: max-height 200ms ease-in, visibility 0s 200ms,
+              opacity 200ms 200ms linear;
+}
+
+/* Controls the animation of the offline content list when it is
+ * collapsed/hidden.
+ */
+#offline-content-list.list-hidden #offline-content-suggestions {
+  max-height: 0;
+  opacity: 0;
+  transition: opacity 200ms linear, visibility 0s 200ms,
+              max-height 200ms 200ms ease-out;
+  visibility: hidden;
+}
+
+#offline-content-list {
+  margin-inline-start: -5%;
+  width: 110%;
+}
+
+/* The selectors below adjust the "overflow" of the suggestion cards contents
+ * based on the same screen size based strategy used for the main frame, which
+ * is applied by the `interstitial-wrapper` class. */
+@media (max-width: 420px)  {
+  #offline-content-list {
+    margin-inline-start: -2.5%;
+    width: 105%;
+  }
+}
+@media (max-width: 420px) and (orientation: portrait),
+       (max-height: 560px) {
+  #offline-content-list {
+    margin-inline-start: -12px;
+    width: calc(100% + 24px);
+  }
+}
+
+.suggestion-with-image .offline-content-suggestion-thumbnail {
+  flex-basis: 8.2em;
+  flex-shrink: 0;
+}
+
+.suggestion-with-image .offline-content-suggestion-thumbnail > img {
+  height: 100%;
+  width: 100%;
+}
+
+.suggestion-with-image #offline-content-list:not(.is-rtl)
+.offline-content-suggestion-thumbnail > img {
+  border-bottom-right-radius: 7px;
+  border-top-right-radius: 7px;
+}
+
+.suggestion-with-image #offline-content-list.is-rtl
+.offline-content-suggestion-thumbnail > img {
+  border-bottom-left-radius: 7px;
+  border-top-left-radius: 7px;
+}
+
+.suggestion-with-icon .offline-content-suggestion-thumbnail {
+  align-items: center;
+  display: flex;
+  justify-content: center;
+  min-height: 4.2em;
+  min-width: 4.2em;
+}
+
+.suggestion-with-icon .offline-content-suggestion-thumbnail > div {
+  align-items: center;
+  background-color: rgb(241, 243, 244);
+  border-radius: 50%;
+  display: flex;
+  height: 2.3em;
+  justify-content: center;
+  width: 2.3em;
+}
+
+.suggestion-with-icon .offline-content-suggestion-thumbnail > div > img {
+  height: 1.45em;
+  width: 1.45em;
+}
+
+.offline-content-suggestion-favicon {
+  height: 1em;
+  margin-inline-end: 0.4em;
+  width: 1.4em;
+}
+
+.offline-content-suggestion-favicon > img {
+  height: 1.4em;
+  width: 1.4em;
+}
+
+.no-favicon .offline-content-suggestion-favicon {
+  display: none;
+}
+
+.image-video {
+  content: url(data:image/svg+xml;base64,PHN2ZyB4bWxucz0iaHR0cDovL3d3dy53My5vcmcvMjAwMC9zdmciIHdpZHRoPSIyNCIgaGVpZ2h0PSIyNCIgdmlld0JveD0iMCAwIDI0IDI0Ij48cGF0aCBkPSJNMTcgMTAuNVY3YTEgMSAwIDAgMC0xLTFINGExIDEgMCAwIDAtMSAxdjEwYTEgMSAwIDAgMCAxIDFoMTJhMSAxIDAgMCAwIDEtMXYtMy41bDQgNHYtMTFsLTQgNHoiIGZpbGw9IiMzQzQwNDMiLz48L3N2Zz4=);
+}
+
+.image-music-note {
+  content: url(data:image/svg+xml;base64,PHN2ZyB4bWxucz0iaHR0cDovL3d3dy53My5vcmcvMjAwMC9zdmciIHdpZHRoPSIyNCIgaGVpZ2h0PSIyNCIgdmlld0JveD0iMCAwIDI0IDI0Ij48cGF0aCBkPSJNMTIgM3Y5LjI2Yy0uNS0uMTctMS0uMjYtMS41LS4yNkM4IDEyIDYgMTQgNiAxNi41UzggMjEgMTAuNSAyMXM0LjUtMiA0LjUtNC41VjZoNFYzaC03eiIgZmlsbD0iIzNDNDA0MyIvPjwvc3ZnPg==);
+}
+
+.image-earth {
+  content: url(data:image/svg+xml;base64,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);
+}
+
+.image-file {
+  content: url(data:image/svg+xml;base64,PHN2ZyB4bWxucz0iaHR0cDovL3d3dy53My5vcmcvMjAwMC9zdmciIHdpZHRoPSIyNCIgaGVpZ2h0PSIyNCIgdmlld0JveD0iMCAwIDI0IDI0Ij48cGF0aCBkPSJNMTMgOVYzLjVMMTguNSA5TTYgMmMtMS4xMSAwLTIgLjg5LTIgMnYxNmEyIDIgMCAwIDAgMiAyaDEyYTIgMiAwIDAgMCAyLTJWOGwtNi02SDZ6IiBmaWxsPSIjM0M0MDQzIi8+PC9zdmc+);
+}
+
+.offline-content-suggestion-texts {
+  display: flex;
+  flex-direction: column;
+  justify-content: space-between;
+  line-height: 1.3;
+  padding: .9em;
+  width: 100%;
+}
+
+.offline-content-suggestion-title {
+  -webkit-box-orient: vertical;
+  -webkit-line-clamp: 3;
+  color: rgb(32, 33, 36);
+  display: -webkit-box;
+  font-size: 1.1em;
+  overflow: hidden;
+  text-overflow: ellipsis;
+}
+
+div.offline-content-suggestion {
+  align-items: stretch;
+  border: 1px solid rgb(218, 220, 224);
+  border-radius: 8px;
+  display: flex;
+  justify-content: space-between;
+  margin-bottom: .8em;
+}
+
+.suggestion-with-image {
+  flex-direction: row;
+  height: 8.2em;
+  max-height: 8.2em;
+}
+
+.suggestion-with-icon {
+  flex-direction: row-reverse;
+  height: 4.2em;
+  max-height: 4.2em;
+}
+
+.suggestion-with-icon .offline-content-suggestion-title {
+  -webkit-line-clamp: 1;
+  word-break: break-all;
+}
+
+.suggestion-with-icon .offline-content-suggestion-texts {
+  padding-inline-start: 0;
+}
+
+.offline-content-suggestion-attribution-freshness {
+  color: rgb(95, 99, 104);
+  display: flex;
+  font-size: .8em;
+  line-height: 1.7em;
+}
+
+.offline-content-suggestion-attribution {
+  -webkit-box-orient: vertical;
+  -webkit-line-clamp: 1;
+  display: -webkit-box;
+  flex-shrink: 1;
+  margin-inline-end: 0.3em;
+  overflow: hidden;
+  overflow-wrap: break-word;
+  text-overflow: ellipsis;
+  word-break: break-all;
+}
+
+.no-attribution .offline-content-suggestion-attribution {
+  display: none;
+}
+
+.offline-content-suggestion-freshness::before {
+  content: '-';
+  display: inline-block;
+  flex-shrink: 0;
+  margin-inline-end: .1em;
+  margin-inline-start: .1em;
+}
+
+.no-attribution .offline-content-suggestion-freshness::before {
+  display: none;
+}
+
+.offline-content-suggestion-freshness {
+  flex-shrink: 0;
+}
+
+.suggestion-with-image .offline-content-suggestion-pin-spacer {
+  flex-grow: 100;
+  flex-shrink: 1;
+}
+
+.suggestion-with-image .offline-content-suggestion-pin {
+  content: url(data:image/svg+xml;base64,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);
+  flex-shrink: 0;
+  height: 1.4em;
+  margin-inline-start: .4em;
+  width: 1.4em;
+}
+
+/* Controls the animation (and a bit more) of the launch-downloads-home action
+ * button when the offline content list is expanded/shown.
+ */
+#offline-content-list-action {
+  text-align: center;
+  transition: visibility 0s 200ms, opacity 200ms 200ms linear;
+}
+
+/* Controls the animation of the launch-downloads-home action button when the
+ * offline content list is collapsed/hidden.
+ */
+#offline-content-list.list-hidden #offline-content-list-action {
+  opacity: 0;
+  transition: opacity 200ms linear, visibility 0s 200ms;
+  visibility: hidden;
+}
+
+#cancel-save-page-button {
+  background-image: url(data:image/svg+xml;base64,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);
+  background-position: right 27px center;
+  background-repeat: no-repeat;
+  border: 1px solid var(--google-gray-300);
+  border-radius: 5px;
+  color: var(--google-gray-700);
+  margin-bottom: 26px;
+  padding-bottom: 16px;
+  padding-inline-end: 88px;
+  padding-inline-start: 16px;
+  padding-top: 16px;
+  text-align: start;
+}
+
+html[dir='rtl'] #cancel-save-page-button {
+  background-position: left 27px center;
+}
+
+#save-page-for-later-button {
+  display: flex;
+  justify-content: start;
+}
+
+#save-page-for-later-button a::before {
+  content: url(data:image/svg+xml;base64,PHN2ZyB4bWxucz0iaHR0cDovL3d3dy53My5vcmcvMjAwMC9zdmciIHdpZHRoPSIxLjJlbSIgaGVpZ2h0PSIxLjJlbSIgdmlld0JveD0iMCAwIDI0IDI0Ij48cGF0aCBkPSJNNSAyMGgxNHYtMkg1bTE0LTloLTRWM0g5djZINWw3IDcgNy03eiIgZmlsbD0iIzQyODVGNCIvPjwvc3ZnPg==);
+  display: inline-block;
+  margin-inline-end: 4px;
+  vertical-align: -webkit-baseline-middle;
+}
+
+.hidden#save-page-for-later-button {
+  display: none;
+}
+
+/* Don't allow overflow when in a subframe. */
+html[subframe] body {
+  overflow: hidden;
+}
+
+#sub-frame-error {
+  -webkit-align-items: center;
+  -webkit-flex-flow: column;
+  -webkit-justify-content: center;
+  background-color: #DDD;
+  display: -webkit-flex;
+  height: 100%;
+  left: 0;
+  position: absolute;
+  text-align: center;
+  top: 0;
+  transition: background-color 200ms ease-in-out;
+  width: 100%;
+}
+
+#sub-frame-error:hover {
+  background-color: #EEE;
+}
+
+#sub-frame-error .icon-generic {
+  margin: 0 0 16px;
+}
+
+#sub-frame-error-details {
+  margin: 0 10px;
+  text-align: center;
+  visibility: hidden;
+}
+
+/* Show details only when hovering. */
+#sub-frame-error:hover #sub-frame-error-details {
+  visibility: visible;
+}
+
+/* If the iframe is too small, always hide the error code. */
+/* TODO(mmenke): See if overflow: no-display works better, once supported. */
+@media (max-width: 200px), (max-height: 95px) {
+  #sub-frame-error-details {
+    display: none;
+  }
+}
+
+/* Adjust icon for small embedded frames in apps. */
+@media (max-height: 100px) {
+  #sub-frame-error .icon-generic {
+    height: auto;
+    margin: 0;
+    padding-top: 0;
+    width: 25px;
+  }
+}
+
+/* details-button is special; it's a <button> element that looks like a link. */
+#details-button {
+  box-shadow: none;
+  min-width: 0;
+}
+
+/* Styles for platform dependent separation of controls and details button. */
+.suggested-left > #control-buttons,
+.suggested-right > #details-button {
+  float: left;
+}
+
+.suggested-right > #control-buttons,
+.suggested-left > #details-button {
+  float: right;
+}
+
+.suggested-left .secondary-button {
+  margin-inline-end: 0;
+  margin-inline-start: 16px;
+}
+
+#details-button.singular {
+  float: none;
+}
+
+/* download-button shows both icon and text. */
+#download-button {
+  padding-bottom: 4px;
+  padding-top: 4px;
+  position: relative;
+}
+
+#download-button::before {
+  background: image-set(
+      url(data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAABgAAAAYCAQAAABKfvVzAAAAO0lEQVQ4y2NgGArgPxIY1YChsOE/LtBAmpYG0mxpIOSDBpKUo2lpIDZxNJCkHKqlYZAla3RAHQ1DFgAARRroHyLNTwwAAAAASUVORK5CYII=) 1x,
+      url(data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAADAAAAAwCAQAAAD9CzEMAAAAZElEQVRYw+3Ruw3AMAwDUY3OzZUmRRD4E9iim9wNwAdbEURHyk4AAAAATiCVK8lLyPsKeT9K3lsownnunfkPxO78hKiYHxBV8x2icr5BVM+/CMf8g3DN34Rzns6ViwHUAUQ/6wIAd5Km7l6c8AAAAABJRU5ErkJggg==) 2x)
+    no-repeat;
+  content: '';
+  display: inline-block;
+  height: 24px;
+  margin-inline-end: 4px;
+  margin-inline-start: -4px;
+  vertical-align: middle;
+  width: 24px;
+}
+
+#download-button:disabled {
+  background: rgb(180, 206, 249);
+  color: rgb(255, 255, 255);
+}
+
+#buttons::after {
+  clear: both;
+  content: '';
+  display: block;
+  width: 100%;
+}
+
+/* Offline page */
+html[dir='rtl'] .runner-container,
+html[dir='rtl'].offline .icon-offline {
+  transform: scaleX(-1);
+}
+
+.offline {
+  transition: filter 1.5s cubic-bezier(0.65, 0.05, 0.36, 1),
+              background-color 1.5s cubic-bezier(0.65, 0.05, 0.36, 1);
+
+  will-change: filter, background-color;
+
+}
+
+.offline body {
+  transition: background-color 1.5s cubic-bezier(0.65, 0.05, 0.36, 1);
+}
+
+.offline #main-message > p {
+  display: none;
+}
+
+.offline.inverted {
+  background-color: #fff;
+  filter: invert(1);
+}
+
+.offline.inverted body {
+  background-color: #fff;
+}
+
+.offline .interstitial-wrapper {
+  color: var(--text-color);
+  font-size: 1em;
+  line-height: 1.55;
+  margin: 0 auto;
+  max-width: 600px;
+  padding-top: 100px;
+  position: relative;
+  width: 100%;
+}
+
+.offline .runner-container {
+  direction: ltr;
+  height: 150px;
+  max-width: 600px;
+  overflow: hidden;
+  position: absolute;
+  top: 35px;
+  width: 44px;
+}
+
+.offline .runner-container:focus {
+  outline: none;
+}
+
+.offline .runner-container:focus-visible {
+  outline: 3px solid var(--google-blue-300);
+}
+
+.offline .runner-canvas {
+  height: 150px;
+  max-width: 600px;
+  opacity: 1;
+  overflow: hidden;
+  position: absolute;
+  top: 0;
+  z-index: 10;
+}
+
+.offline .controller {
+  height: 100vh;
+  left: 0;
+  position: absolute;
+  top: 0;
+  width: 100vw;
+  z-index: 9;
+}
+
+#offline-resources {
+  display: none;
+}
+
+#offline-instruction {
+  image-rendering: pixelated;
+  left: 0;
+  margin: auto;
+  position: absolute;
+  right: 0;
+  top: 60px;
+  width: fit-content;
+}
+
+.offline-runner-live-region {
+  bottom: 0;
+  clip-path: polygon(0 0, 0 0, 0 0);
+  color: var(--background-color);
+  display: block;
+  font-size: xx-small;
+  overflow: hidden;
+  position: absolute;
+  text-align: center;
+  transition: color 1.5s cubic-bezier(0.65, 0.05, 0.36, 1);
+  user-select: none;
+}
+
+/* Custom toggle */
+.slow-speed-option {
+  align-items: center;
+  background: var(--google-gray-50);
+  border-radius: 24px/50%;
+  bottom: 0;
+  color: var(--error-code-color);
+  display: inline-flex;
+  font-size: 1em;
+  left: 0;
+  line-height: 1.1em;
+  margin: 5px auto;
+  padding: 2px 12px 3px 20px;
+  position: absolute;
+  right: 0;
+  width: max-content;
+  z-index: 999;
+}
+
+.slow-speed-option.hidden {
+  display: none;
+}
+
+.slow-speed-option [type=checkbox] {
+  opacity: 0;
+  pointer-events: none;
+  position: absolute;
+}
+
+.slow-speed-option .slow-speed-toggle {
+  cursor: pointer;
+  margin-inline-start: 8px;
+  padding: 8px 4px;
+  position: relative;
+}
+
+.slow-speed-option [type=checkbox]:disabled ~ .slow-speed-toggle {
+  cursor: default;
+}
+
+.slow-speed-option-label [type=checkbox] {
+  opacity: 0;
+  pointer-events: none;
+  position: absolute;
+}
+
+.slow-speed-option .slow-speed-toggle::before,
+.slow-speed-option .slow-speed-toggle::after {
+  content: '';
+  display: block;
+  margin: 0 3px;
+  transition: all 100ms cubic-bezier(0.4, 0, 1, 1);
+}
+
+.slow-speed-option .slow-speed-toggle::before {
+  background: rgb(189,193,198);
+  border-radius: 0.65em;
+  height: 0.9em;
+  width: 2em;
+}
+
+.slow-speed-option .slow-speed-toggle::after {
+  background: #fff;
+  border-radius: 50%;
+  box-shadow: 0 1px 3px 0 rgb(0 0 0 / 40%);
+  height: 1.2em;
+  position: absolute;
+  top: 51%;
+  transform: translate(-20%, -50%);
+  width: 1.1em;
+}
+
+.slow-speed-option [type=checkbox]:focus + .slow-speed-toggle {
+  box-shadow: 0 0 8px rgb(94, 158, 214);
+  outline: 1px solid rgb(93, 157, 213);
+}
+
+.slow-speed-option [type=checkbox]:checked + .slow-speed-toggle::before {
+  background: var(--google-blue-600);
+  opacity: 0.5;
+}
+
+.slow-speed-option [type=checkbox]:checked + .slow-speed-toggle::after {
+  background: var(--google-blue-600);
+  transform: translate(calc(2em - 90%), -50%);
+}
+
+.slow-speed-option [type=checkbox]:checked:disabled +
+  .slow-speed-toggle::before {
+  background: rgb(189,193,198);
+}
+
+.slow-speed-option [type=checkbox]:checked:disabled +
+  .slow-speed-toggle::after {
+  background: var(--google-gray-50);
+}
+
+@media (max-width: 420px) {
+  #download-button {
+    padding-bottom: 12px;
+    padding-top: 12px;
+  }
+
+  .suggested-left > #control-buttons,
+  .suggested-right > #control-buttons {
+    float: none;
+  }
+
+  .snackbar {
+    border-radius: 0;
+    bottom: 0;
+    left: 0;
+    width: 100%;
+  }
+}
+
+@media (max-height: 350px) {
+  h1 {
+    margin: 0 0 15px;
+  }
+
+  .icon-offline {
+    margin: 0 0 10px;
+  }
+
+  .interstitial-wrapper {
+    margin-top: 5%;
+  }
+
+  .nav-wrapper {
+    margin-top: 30px;
+  }
+}
+
+@media (min-width: 420px) and (max-width: 736px) and
+       (min-height: 240px) and (max-height: 420px) and
+       (orientation:landscape) {
+  .interstitial-wrapper {
+    margin-bottom: 100px;
+  }
+}
+
+@media (max-width: 360px) and (max-height: 480px) {
+  .offline .interstitial-wrapper {
+    padding-top: 60px;
+  }
+
+  .offline .runner-container {
+    top: 8px;
+  }
+}
+
+@media (min-height: 240px) and (orientation: landscape) {
+  .offline .interstitial-wrapper {
+    margin-bottom: 90px;
+  }
+
+  .icon-offline {
+    margin-bottom: 20px;
+  }
+}
+
+@media (max-height: 320px) and (orientation: landscape) {
+  .icon-offline {
+    margin-bottom: 0;
+  }
+
+  .offline .runner-container {
+    top: 10px;
+  }
+}
+
+@media (max-width: 240px) {
+  button {
+    padding-inline-end: 12px;
+    padding-inline-start: 12px;
+  }
+
+  .interstitial-wrapper {
+    overflow: inherit;
+    padding: 0 8px;
+  }
+}
+
+@media (max-width: 120px) {
+  button {
+    width: auto;
+  }
+}
+
+.arcade-mode,
+.arcade-mode .runner-container,
+.arcade-mode .runner-canvas {
+  image-rendering: pixelated;
+  max-width: 100%;
+  overflow: hidden;
+}
+
+.arcade-mode #buttons,
+.arcade-mode #main-content {
+  opacity: 0;
+  overflow: hidden;
+}
+
+.arcade-mode .interstitial-wrapper {
+  height: 100vh;
+  max-width: 100%;
+  overflow: hidden;
+}
+
+.arcade-mode .runner-container {
+  left: 0;
+  margin: auto;
+  right: 0;
+  transform-origin: top center;
+  transition: transform 250ms cubic-bezier(0.4, 0, 1, 1) 400ms;
+  z-index: 2;
+}
+
+@media (prefers-color-scheme: dark) {
+  .icon {
+    filter: invert(1);
+  }
+
+  .offline .runner-canvas {
+    filter: invert(1);
+  }
+
+  .offline.inverted {
+    background-color: var(--background-color);
+    filter: invert(0);
+  }
+
+  .offline.inverted body {
+    background-color: #fff;
+  }
+
+  .offline.inverted .offline-runner-live-region {
+    color: #fff;
+  }
+
+  #suggestions-list a {
+    color: var(--link-color);
+  }
+
+  #error-information-button {
+    filter: invert(0.6);
+  }
+
+  .slow-speed-option {
+    background: var(--google-gray-800);
+    color: var(--google-gray-100);
+  }
+
+  .slow-speed-option .slow-speed-toggle::before,
+  .slow-speed-option [type=checkbox]:checked:disabled +
+    .slow-speed-toggle::before {
+     background: rgb(189,193,198);
+  }
+
+  .slow-speed-option [type=checkbox]:checked + .slow-speed-toggle::after,
+  .slow-speed-option [type=checkbox]:checked + .slow-speed-toggle::before {
+    background: var(--google-blue-300);
+  }
+}
+</style>
+  <script>(function(){function l(a,b,c){return Function.prototype.call.apply(Array.prototype.slice,arguments)}function m(a,b,c){var e=l(arguments,2);return function(){return b.apply(a,e)}}function n(a,b){var c=new p(b);for(c.h=[a];c.h.length;){var e=c,d=c.h.shift();e.i(d);for(d=d.firstChild;d;d=d.nextSibling)1==d.nodeType&&e.h.push(d);}}function p(a){this.i=a;}function q(a){a.style.display="";}function r(a){a.style.display="none";}var t=/\s*;\s*/;function u(a,b){this.l.apply(this,arguments);}u.prototype.l=function(a,b){this.a||(this.a={});if(b){var c=this.a,e=b.a;for(d in e)c[d]=e[d];}else {var d=this.a;e=v;for(c in e)d[c]=e[c];}this.a.$this=a;this.a.$context=this;this.f="undefined"!=typeof a&&null!=a?a:"";b||(this.a.$top=this.f);};var v={$default:null},w=[];function x(a){for(var b in a.a)delete a.a[b];a.f=null;w.push(a);}function y(a,b,c){try{return b.call(c,a.a,a.f)}catch(e){return v.$default}}
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+function S(a,b){var c=document;if(b){var e=c.getElementById(a);if(!e){e=b();var d=c.getElementById("jsts");d||(d=c.createElement("div"),d.id="jsts",r(d),d.style.position="absolute",c.body.appendChild(d));var g=c.createElement("div");d.appendChild(g);g.innerHTML=e;e=c.getElementById(a);}c=e;}else c=c.getElementById(a);return c?(L(c),c=c.cloneNode(!0),c.removeAttribute("id"),c):null}function T(a,b,c){c==b.length-1?a.setAttribute("jsinstance","*"+c):a.setAttribute("jsinstance",""+c);}window.jstGetTemplate=S;window.JsEvalContext=u;window.jstProcess=function(a,b){var c=new F;L(b);c.m=b?9==b.nodeType?b:b.ownerDocument||document:document;var e=m(c,c.g,a,b),d=c.j=[],g=c.o=[];c.c=[];e();for(var h,f,k;d.length;)h=d[d.length-1],e=g[g.length-1],e>=h.length?(e=c,f=d.pop(),f.length=0,e.c.push(f),g.pop()):(f=h[e++],k=h[e++],h=h[e++],g[g.length-1]=e,f.call(c,k,h));};
+})();
+
+// Copyright 2017 The Chromium Authors
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+
+const HIDDEN_CLASS$1 = 'hidden';
+
+// 
+
+//
+
+// Copyright 2015 The Chromium Authors
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+
+let mobileNav = false;
+
+/**
+ * For small screen mobile the navigation buttons are moved
+ * below the advanced text.
+ */
+function onResize() {
+  const helpOuterBox = document.querySelector('#details');
+  const mainContent = document.querySelector('#main-content');
+  const mediaQuery = '(min-width: 240px) and (max-width: 420px) and ' +
+      '(min-height: 401px), ' +
+      '(max-height: 560px) and (min-height: 240px) and ' +
+      '(min-width: 421px)';
+
+  const detailsHidden = helpOuterBox.classList.contains(HIDDEN_CLASS$1);
+  const runnerContainer = document.querySelector('.runner-container');
+
+  // Check for change in nav status.
+  if (mobileNav !== window.matchMedia(mediaQuery).matches) {
+    mobileNav = !mobileNav;
+
+    // Handle showing the top content / details sections according to state.
+    if (mobileNav) {
+      mainContent.classList.toggle(HIDDEN_CLASS$1, !detailsHidden);
+      helpOuterBox.classList.toggle(HIDDEN_CLASS$1, detailsHidden);
+      if (runnerContainer) {
+        runnerContainer.classList.toggle(HIDDEN_CLASS$1, !detailsHidden);
+      }
+    } else if (!detailsHidden) {
+      // Non mobile nav with visible details.
+      mainContent.classList.remove(HIDDEN_CLASS$1);
+      helpOuterBox.classList.remove(HIDDEN_CLASS$1);
+      if (runnerContainer) {
+        runnerContainer.classList.remove(HIDDEN_CLASS$1);
+      }
+    }
+  }
+}
+
+function setupMobileNav() {
+  window.addEventListener('resize', onResize);
+  onResize();
+}
+
+document.addEventListener('DOMContentLoaded', setupMobileNav);
+
+// Copyright 2022 The Chromium Authors
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+/**
+ * Verify |value| is truthy.
+ * @param value A value to check for truthiness. Note that this
+ *     may be used to test whether |value| is defined or not, and we don't want
+ *     to force a cast to boolean.
+ */
+function assert(value, message) {
+    if (value) {
+        return;
+    }
+    throw new Error('Assertion failed' + (message ? `: ${message}` : ''));
+}
+
+// Copyright 2022 The Chromium Authors
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+/**
+ * @fileoverview This file defines a singleton which provides access to all data
+ * that is available as soon as the page's resources are loaded (before DOM
+ * content has finished loading). This data includes both localized strings and
+ * any data that is important to have ready from a very early stage (e.g. things
+ * that must be displayed right away).
+ *
+ * Note that loadTimeData is not guaranteed to be consistent between page
+ * refreshes (https://crbug.com/740629) and should not contain values that might
+ * change if the page is re-opened later.
+ */
+class LoadTimeData {
+    data_ = null;
+    /**
+     * Sets the backing object.
+     *
+     * Note that there is no getter for |data_| to discourage abuse of the form:
+     *
+     *     var value = loadTimeData.data()['key'];
+     */
+    set data(value) {
+        assert(!this.data_, 'Re-setting data.');
+        this.data_ = value;
+    }
+    /**
+     * @param id An ID of a value that might exist.
+     * @return True if |id| is a key in the dictionary.
+     */
+    valueExists(id) {
+        assert(this.data_, 'No data. Did you remember to include strings.js?');
+        return id in this.data_;
+    }
+    /**
+     * Fetches a value, expecting that it exists.
+     * @param id The key that identifies the desired value.
+     * @return The corresponding value.
+     */
+    getValue(id) {
+        assert(this.data_, 'No data. Did you remember to include strings.js?');
+        const value = this.data_[id];
+        assert(typeof value !== 'undefined', 'Could not find value for ' + id);
+        return value;
+    }
+    /**
+     * As above, but also makes sure that the value is a string.
+     * @param id The key that identifies the desired string.
+     * @return The corresponding string value.
+     */
+    getString(id) {
+        const value = this.getValue(id);
+        assert(typeof value === 'string', `[${value}] (${id}) is not a string`);
+        return value;
+    }
+    /**
+     * Returns a formatted localized string where $1 to $9 are replaced by the
+     * second to the tenth argument.
+     * @param id The ID of the string we want.
+     * @param args The extra values to include in the formatted output.
+     * @return The formatted string.
+     */
+    getStringF(id, ...args) {
+        const value = this.getString(id);
+        if (!value) {
+            return '';
+        }
+        return this.substituteString(value, ...args);
+    }
+    /**
+     * Returns a formatted localized string where $1 to $9 are replaced by the
+     * second to the tenth argument. Any standalone $ signs must be escaped as
+     * $$.
+     * @param label The label to substitute through. This is not an resource ID.
+     * @param args The extra values to include in the formatted output.
+     * @return The formatted string.
+     */
+    substituteString(label, ...args) {
+        return label.replace(/\$(.|$|\n)/g, function (m) {
+            assert(m.match(/\$[$1-9]/), 'Unescaped $ found in localized string.');
+            if (m === '$$') {
+                return '$';
+            }
+            const substitute = args[Number(m[1]) - 1];
+            if (substitute === undefined || substitute === null) {
+                // Not all callers actually provide values for all substitutes. Return
+                // an empty value for this case.
+                return '';
+            }
+            return substitute.toString();
+        });
+    }
+    /**
+     * Returns a formatted string where $1 to $9 are replaced by the second to
+     * tenth argument, split apart into a list of pieces describing how the
+     * substitution was performed. Any standalone $ signs must be escaped as $$.
+     * @param label A localized string to substitute through.
+     *     This is not an resource ID.
+     * @param args The extra values to include in the formatted output.
+     * @return The formatted string pieces.
+     */
+    getSubstitutedStringPieces(label, ...args) {
+        // Split the string by separately matching all occurrences of $1-9 and of
+        // non $1-9 pieces.
+        const pieces = (label.match(/(\$[1-9])|(([^$]|\$([^1-9]|$))+)/g) ||
+            []).map(function (p) {
+            // Pieces that are not $1-9 should be returned after replacing $$
+            // with $.
+            if (!p.match(/^\$[1-9]$/)) {
+                assert((p.match(/\$/g) || []).length % 2 === 0, 'Unescaped $ found in localized string.');
+                return { value: p.replace(/\$\$/g, '$'), arg: null };
+            }
+            // Otherwise, return the substitution value.
+            const substitute = args[Number(p[1]) - 1];
+            if (substitute === undefined || substitute === null) {
+                // Not all callers actually provide values for all substitutes. Return
+                // an empty value for this case.
+                return { value: '', arg: p };
+            }
+            return { value: substitute.toString(), arg: p };
+        });
+        return pieces;
+    }
+    /**
+     * As above, but also makes sure that the value is a boolean.
+     * @param id The key that identifies the desired boolean.
+     * @return The corresponding boolean value.
+     */
+    getBoolean(id) {
+        const value = this.getValue(id);
+        assert(typeof value === 'boolean', `[${value}] (${id}) is not a boolean`);
+        return value;
+    }
+    /**
+     * As above, but also makes sure that the value is an integer.
+     * @param id The key that identifies the desired number.
+     * @return The corresponding number value.
+     */
+    getInteger(id) {
+        const value = this.getValue(id);
+        assert(typeof value === 'number', `[${value}] (${id}) is not a number`);
+        assert(value === Math.floor(value), 'Number isn\'t integer: ' + value);
+        return value;
+    }
+    /**
+     * Override values in loadTimeData with the values found in |replacements|.
+     * @param replacements The dictionary object of keys to replace.
+     */
+    overrideValues(replacements) {
+        assert(typeof replacements === 'object', 'Replacements must be a dictionary object.');
+        assert(this.data_, 'Data must exist before being overridden');
+        for (const key in replacements) {
+            this.data_[key] = replacements[key];
+        }
+    }
+    /**
+     * Reset loadTimeData's data. Should only be used in tests.
+     * @param newData The data to restore to, when null restores to unset state.
+     */
+    resetForTesting(newData = null) {
+        this.data_ = newData;
+    }
+    /**
+     * @return Whether loadTimeData.data has been set.
+     */
+    isInitialized() {
+        return this.data_ !== null;
+    }
+}
+const loadTimeData = new LoadTimeData();
+
+// Copyright 2023 The Chromium Authors
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+const HIDDEN_CLASS = 'hidden';
+
+// Copyright 2021 The Chromium Authors
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+/* @const
+ * Add matching sprite definition and config to spriteDefinitionByType.
+ */
+const GAME_TYPE = ['altgame'];
+
+//******************************************************************************
+
+/**
+ * Collision box object.
+ * @param {number} x X position.
+ * @param {number} y Y Position.
+ * @param {number} w Width.
+ * @param {number} h Height.
+ * @constructor
+ */
+function CollisionBox(x, y, w, h) {
+  this.x = x;
+  this.y = y;
+  this.width = w;
+  this.height = h;
+}
+
+/**
+ * T-Rex runner sprite definitions.
+ */
+const spriteDefinitionByType = {
+  original: {
+    LDPI: {
+      BACKGROUND_EL: {x: 86, y: 2},
+      CACTUS_LARGE: {x: 332, y: 2},
+      CACTUS_SMALL: {x: 228, y: 2},
+      OBSTACLE_2: {x: 332, y: 2},
+      OBSTACLE: {x: 228, y: 2},
+      CLOUD: {x: 86, y: 2},
+      HORIZON: {x: 2, y: 54},
+      MOON: {x: 484, y: 2},
+      PTERODACTYL: {x: 134, y: 2},
+      RESTART: {x: 2, y: 68},
+      TEXT_SPRITE: {x: 655, y: 2},
+      TREX: {x: 848, y: 2},
+      STAR: {x: 645, y: 2},
+      COLLECTABLE: {x: 0, y: 0},
+      ALT_GAME_END: {x: 32, y: 0},
+    },
+    HDPI: {
+      BACKGROUND_EL: {x: 166, y: 2},
+      CACTUS_LARGE: {x: 652, y: 2},
+      CACTUS_SMALL: {x: 446, y: 2},
+      OBSTACLE_2: {x: 652, y: 2},
+      OBSTACLE: {x: 446, y: 2},
+      CLOUD: {x: 166, y: 2},
+      HORIZON: {x: 2, y: 104},
+      MOON: {x: 954, y: 2},
+      PTERODACTYL: {x: 260, y: 2},
+      RESTART: {x: 2, y: 130},
+      TEXT_SPRITE: {x: 1294, y: 2},
+      TREX: {x: 1678, y: 2},
+      STAR: {x: 1276, y: 2},
+      COLLECTABLE: {x: 0, y: 0},
+      ALT_GAME_END: {x: 64, y: 0},
+    },
+    MAX_GAP_COEFFICIENT: 1.5,
+    MAX_OBSTACLE_LENGTH: 3,
+    HAS_CLOUDS: 1,
+    BOTTOM_PAD: 10,
+    TREX: {
+      WAITING_1: {x: 44, w: 44, h: 47, xOffset: 0},
+      WAITING_2: {x: 0, w: 44, h: 47, xOffset: 0},
+      RUNNING_1: {x: 88, w: 44, h: 47, xOffset: 0},
+      RUNNING_2: {x: 132, w: 44, h: 47, xOffset: 0},
+      JUMPING: {x: 0, w: 44, h: 47, xOffset: 0},
+      CRASHED: {x: 220, w: 44, h: 47, xOffset: 0},
+      COLLISION_BOXES: [
+        new CollisionBox(22, 0, 17, 16),
+        new CollisionBox(1, 18, 30, 9),
+        new CollisionBox(10, 35, 14, 8),
+        new CollisionBox(1, 24, 29, 5),
+        new CollisionBox(5, 30, 21, 4),
+        new CollisionBox(9, 34, 15, 4),
+      ],
+    },
+    /** @type {Array<ObstacleType>} */
+    OBSTACLES: [
+      {
+        type: 'CACTUS_SMALL',
+        width: 17,
+        height: 35,
+        yPos: 105,
+        multipleSpeed: 4,
+        minGap: 120,
+        minSpeed: 0,
+        collisionBoxes: [
+          new CollisionBox(0, 7, 5, 27),
+          new CollisionBox(4, 0, 6, 34),
+          new CollisionBox(10, 4, 7, 14),
+        ],
+      },
+      {
+        type: 'CACTUS_LARGE',
+        width: 25,
+        height: 50,
+        yPos: 90,
+        multipleSpeed: 7,
+        minGap: 120,
+        minSpeed: 0,
+        collisionBoxes: [
+          new CollisionBox(0, 12, 7, 38),
+          new CollisionBox(8, 0, 7, 49),
+          new CollisionBox(13, 10, 10, 38),
+        ],
+      },
+      {
+        type: 'PTERODACTYL',
+        width: 46,
+        height: 40,
+        yPos: [100, 75, 50],    // Variable height.
+        yPosMobile: [100, 50],  // Variable height mobile.
+        multipleSpeed: 999,
+        minSpeed: 8.5,
+        minGap: 150,
+        collisionBoxes: [
+          new CollisionBox(15, 15, 16, 5),
+          new CollisionBox(18, 21, 24, 6),
+          new CollisionBox(2, 14, 4, 3),
+          new CollisionBox(6, 10, 4, 7),
+          new CollisionBox(10, 8, 6, 9),
+        ],
+        numFrames: 2,
+        frameRate: 1000 / 6,
+        speedOffset: .8,
+      },
+      {
+        type: 'COLLECTABLE',
+        width: 31,
+        height: 24,
+        yPos: 104,
+        multipleSpeed: 1000,
+        minGap: 9999,
+        minSpeed: 0,
+        collisionBoxes: [
+          new CollisionBox(0, 0, 32, 25),
+        ],
+      },
+    ],
+    BACKGROUND_EL: {
+      'CLOUD': {
+        HEIGHT: 14,
+        MAX_CLOUD_GAP: 400,
+        MAX_SKY_LEVEL: 30,
+        MIN_CLOUD_GAP: 100,
+        MIN_SKY_LEVEL: 71,
+        OFFSET: 4,
+        WIDTH: 46,
+        X_POS: 1,
+        Y_POS: 120,
+      },
+    },
+    BACKGROUND_EL_CONFIG: {
+      MAX_BG_ELS: 1,
+      MAX_GAP: 400,
+      MIN_GAP: 100,
+      POS: 0,
+      SPEED: 0.5,
+      Y_POS: 125,
+    },
+    LINES: [
+      {SOURCE_X: 2, SOURCE_Y: 52, WIDTH: 600, HEIGHT: 12, YPOS: 127},
+    ],
+    ALT_GAME_OVER_TEXT_CONFIG: {
+      TEXT_X: 32,
+      TEXT_Y: 0,
+      TEXT_WIDTH: 246,
+      TEXT_HEIGHT: 17,
+      FLASH_DURATION: 1500,
+      FLASHING: false,
+    },
+  },
+  altgame: {
+    LDPI: {
+      BACKGROUND_EL: {x: 260, y: 19},
+      OBSTACLE1: {x: 152, y: 65},
+      OBSTACLE2: {x: 188, y: 65},
+      OBSTACLE3: {x: 152, y: 65},
+      OBSTACLE4: {x: 188, y: 65},
+      OBSTACLE5: {x: 0, y: 60},
+      OBSTACLE6: {x: 42, y: 58},
+      OBSTACLE7: {x: 98, y: 58},
+      OBSTACLE8: {x: 96, y: 19},
+      HORIZON: {x: 0, y: 3},
+      TREX: {x: 557, y: 63},
+      COLLECTABLE: {x: 193, y: 19},
+    },
+    HDPI: {
+      BACKGROUND_EL: {x: 520, y: 38},
+      OBSTACLE1: {x: 304, y: 130},
+      OBSTACLE2: {x: 376, y: 130},
+      OBSTACLE3: {x: 304, y: 130},
+      OBSTACLE4: {x: 376, y: 130},
+      OBSTACLE5: {x: 0, y: 120},
+      OBSTACLE6: {x: 84, y: 116},
+      OBSTACLE7: {x: 196, y: 116},
+      OBSTACLE8: {x: 192, y: 38},
+      HORIZON: {x: 0, y: 6},
+      TREX: {x: 1114, y: 126},
+      COLLECTABLE: {x: 386, y: 38},
+    },
+    MAX_GAP_COEFFICIENT: 1.5,
+    MAX_OBSTACLE_LENGTH: 2,
+    HAS_CLOUDS: 0,
+    BOTTOM_PAD: 10,
+    TREX: {
+      MAX_JUMP_HEIGHT: 50,
+      MIN_JUMP_HEIGHT: 40,
+      INITIAL_JUMP_VELOCITY: -10,
+      RUNNING_1: {x: 96, w: 49, h: 47, xOffset: 0},
+      RUNNING_2: {x: 145, w: 49, h: 47, xOffset: 0},
+      JUMPING: {x: 47, w: 49, h: 47, xOffset: 0},
+      CRASHED: {x: 194, w: 62, h: 47, xOffset: 0},
+      DUCKING_1: {x: 257, w: 55, h: 26, xOffset: 0},
+      DUCKING_2: {x: 316, w: 55, h: 26, xOffset: 0},
+      COLLISION_BOXES: [
+        new CollisionBox(22, 0, 17, 16),
+        new CollisionBox(1, 18, 30, 9),
+        new CollisionBox(10, 35, 14, 8),
+        new CollisionBox(1, 24, 29, 5),
+        new CollisionBox(5, 30, 21, 4),
+        new CollisionBox(9, 34, 15, 4),
+      ],
+    },
+    /** @type {Array<ObstacleType>} */
+    OBSTACLES: [
+      {
+        type: 'OBSTACLE1',
+        width: 36,
+        height: 45,
+        yPos: 95,
+        multipleSpeed: 999,
+        minGap: 120,
+        minSpeed: 0,
+        collisionBoxes: [
+          new CollisionBox(0, 17, 8, 28),
+          new CollisionBox(6, 3, 24, 42),
+          new CollisionBox(28, 17, 8, 28),
+        ],
+      },
+      {
+        type: 'OBSTACLE2',
+        width: 36,
+        height: 45,
+        yPos: 95,
+        multipleSpeed: 999,
+        minGap: 120,
+        minSpeed: 0,
+        collisionBoxes: [
+          new CollisionBox(0, 17, 8, 28),
+          new CollisionBox(6, 3, 24, 42),
+          new CollisionBox(28, 17, 8, 28),
+        ],
+      },
+      {
+        type: 'OBSTACLE3',
+        width: 72,
+        height: 45,
+        yPos: 95,
+        multipleSpeed: 999,
+        minGap: 120,
+        minSpeed: 8,
+        collisionBoxes: [
+          new CollisionBox(0, 17, 8, 28),
+          new CollisionBox(6, 3, 24, 42),
+          new CollisionBox(28, 17, 8, 28),
+          new CollisionBox(36, 17, 8, 28),
+          new CollisionBox(42, 3, 24, 42),
+          new CollisionBox(64, 17, 8, 28),
+        ],
+      },
+      {
+        type: 'OBSTACLE4',
+        width: 72,
+        height: 45,
+        yPos: 95,
+        multipleSpeed: 999,
+        minGap: 120,
+        minSpeed: 8,
+        collisionBoxes: [
+          new CollisionBox(0, 17, 8, 28),
+          new CollisionBox(6, 3, 24, 42),
+          new CollisionBox(28, 17, 8, 28),
+          new CollisionBox(36, 17, 8, 28),
+          new CollisionBox(42, 3, 24, 42),
+          new CollisionBox(64, 17, 8, 28),
+        ],
+      },
+      {
+        type: 'OBSTACLE5',
+        width: 42,
+        height: 50,
+        yPos: 95,
+        multipleSpeed: 999,
+        minGap: 120,
+        minSpeed: 5,
+        collisionBoxes: [
+          new CollisionBox(0, 0, 42, 50),
+        ],
+      },
+      {
+        type: 'OBSTACLE6',
+        width: 56,
+        height: 52,
+        yPos: 93,
+        multipleSpeed: 999,
+        minGap: 120,
+        minSpeed: 7,
+        collisionBoxes: [
+          new CollisionBox(0, 11, 8, 40),
+          new CollisionBox(8, 0, 19, 51),
+          new CollisionBox(27, 11, 28, 40),
+        ],
+      },
+      {
+        type: 'OBSTACLE7',
+        width: 54,
+        height: 52,
+        yPos: 93,
+        multipleSpeed: 999,
+        minGap: 120,
+        minSpeed: 6,
+        collisionBoxes: [
+          new CollisionBox(0, 11, 19, 40),
+          new CollisionBox(19, 0, 19, 51),
+          new CollisionBox(38, 14, 15, 37),
+        ],
+      },
+      {
+        type: 'OBSTACLE8',
+        width: 49,
+        height: 20,
+        yPos: [100, 75, 50],    // Variable height.
+        yPosMobile: [100, 50],  // Variable height mobile.
+        multipleSpeed: 999,
+        minSpeed: 8.5,
+        minGap: 150,
+        collisionBoxes: [
+          new CollisionBox(15, 15, 16, 5),
+          new CollisionBox(18, 21, 24, 6),
+          new CollisionBox(2, 14, 4, 3),
+          new CollisionBox(6, 10, 4, 7),
+          new CollisionBox(10, 8, 6, 9),
+        ],
+        numFrames: 2,
+        frameRate: 1000 / 6,
+        speedOffset: .8,
+      },
+    ],
+    BACKGROUND_EL: {
+      'GROUP1': {
+        HEIGHT: 91,
+        MAX_CLOUD_GAP: 600,
+        MAX_SKY_LEVEL: 0,
+        MIN_CLOUD_GAP: 300,
+        MIN_SKY_LEVEL: 0,
+        OFFSET: 11,
+        WIDTH: 131,
+        X_POS: 260,
+      },
+      'GROUP2': {
+        HEIGHT: 91,
+        MAX_CLOUD_GAP: 600,
+        MAX_SKY_LEVEL: 0,
+        MIN_CLOUD_GAP: 300,
+        MIN_SKY_LEVEL: 0,
+        OFFSET: 11,
+        WIDTH: 166,
+        X_POS: 391,
+      },
+    },
+    BACKGROUND_EL_CONFIG: {
+      MAX_BG_ELS: 8,
+      MAX_GAP: 600,
+      MIN_GAP: 300,
+      POS: 0,
+      SPEED: 0.8,
+      Y_POS: 122,
+    },
+    LINES: [
+      {SOURCE_X: 2, SOURCE_Y: 3, WIDTH: 600, HEIGHT: 12, YPOS: 128},
+    ],
+  },
+};
+
+// Copyright 2014 The Chromium Authors
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+
+/**
+ * T-Rex runner.
+ * @param {string} outerContainerId Outer containing element id.
+ * @param {!Object=} opt_config
+ * @constructor
+ * @implements {EventListener}
+ * @export
+ */
+function Runner(outerContainerId, opt_config) {
+  // Singleton
+  if (Runner.instance_) {
+    return Runner.instance_;
+  }
+  Runner.instance_ = this;
+
+  this.outerContainerEl = document.querySelector(outerContainerId);
+  this.containerEl = null;
+  this.snackbarEl = null;
+  // A div to intercept touch events. Only set while (playing && useTouch).
+  this.touchController = null;
+
+  this.config = opt_config || Object.assign(Runner.config, Runner.normalConfig);
+  // Logical dimensions of the container.
+  this.dimensions = Runner.defaultDimensions;
+
+  this.gameType = null;
+  Runner.spriteDefinition = spriteDefinitionByType['original'];
+
+  this.altGameImageSprite = null;
+  this.altGameModeActive = false;
+  this.altGameModeFlashTimer = null;
+  this.fadeInTimer = 0;
+
+  this.canvas = null;
+  this.canvasCtx = null;
+
+  this.tRex = null;
+
+  this.distanceMeter = null;
+  this.distanceRan = 0;
+
+  this.highestScore = 0;
+  this.syncHighestScore = false;
+
+  this.time = 0;
+  this.runningTime = 0;
+  this.msPerFrame = 1000 / FPS;
+  this.currentSpeed = this.config.SPEED;
+  Runner.slowDown = false;
+
+  this.obstacles = [];
+
+  this.activated = false; // Whether the easter egg has been activated.
+  this.playing = false; // Whether the game is currently in play state.
+  this.crashed = false;
+  this.paused = false;
+  this.inverted = false;
+  this.invertTimer = 0;
+  this.resizeTimerId_ = null;
+
+  this.playCount = 0;
+
+  // Sound FX.
+  this.audioBuffer = null;
+
+  /** @type {Object} */
+  this.soundFx = {};
+  this.generatedSoundFx = null;
+
+  // Global web audio context for playing sounds.
+  this.audioContext = null;
+
+  // Images.
+  this.images = {};
+  this.imagesLoaded = 0;
+
+  // Gamepad state.
+  this.pollingGamepads = false;
+  this.gamepadIndex = undefined;
+  this.previousGamepad = null;
+
+  if (this.isDisabled()) {
+    this.setupDisabledRunner();
+  } else {
+    if (Runner.isAltGameModeEnabled()) {
+      this.initAltGameType();
+      Runner.gameType = this.gameType;
+    }
+    this.loadImages();
+
+    window['initializeEasterEggHighScore'] =
+        this.initializeHighScore.bind(this);
+  }
+}
+
+/**
+ * Default game width.
+ * @const
+ */
+const DEFAULT_WIDTH = 600;
+
+/**
+ * Frames per second.
+ * @const
+ */
+const FPS = 60;
+
+/** @const */
+const IS_HIDPI = window.devicePixelRatio > 1;
+
+/** @const */
+const IS_IOS = /CriOS/.test(window.navigator.userAgent);
+
+/** @const */
+const IS_MOBILE = /Android/.test(window.navigator.userAgent) || IS_IOS;
+
+/** @const */
+const IS_RTL = document.querySelector('html').dir == 'rtl';
+
+/** @const */
+const ARCADE_MODE_URL = 'chrome://dino/';
+
+/** @const */
+const RESOURCE_POSTFIX = 'offline-resources-';
+
+/** @const */
+const A11Y_STRINGS = {
+  ariaLabel: 'dinoGameA11yAriaLabel',
+  description: 'dinoGameA11yDescription',
+  gameOver: 'dinoGameA11yGameOver',
+  highScore: 'dinoGameA11yHighScore',
+  jump: 'dinoGameA11yJump',
+  started: 'dinoGameA11yStartGame',
+  speedLabel: 'dinoGameA11ySpeedToggle',
+};
+
+/**
+ * Default game configuration.
+ * Shared config for all  versions of the game. Additional parameters are
+ * defined in Runner.normalConfig and Runner.slowConfig.
+ */
+Runner.config = {
+  AUDIOCUE_PROXIMITY_THRESHOLD: 190,
+  AUDIOCUE_PROXIMITY_THRESHOLD_MOBILE_A11Y: 250,
+  BG_CLOUD_SPEED: 0.2,
+  BOTTOM_PAD: 10,
+  // Scroll Y threshold at which the game can be activated.
+  CANVAS_IN_VIEW_OFFSET: -10,
+  CLEAR_TIME: 3000,
+  CLOUD_FREQUENCY: 0.5,
+  FADE_DURATION: 1,
+  FLASH_DURATION: 1000,
+  GAMEOVER_CLEAR_TIME: 1200,
+  INITIAL_JUMP_VELOCITY: 12,
+  INVERT_FADE_DURATION: 12000,
+  MAX_BLINK_COUNT: 3,
+  MAX_CLOUDS: 6,
+  MAX_OBSTACLE_LENGTH: 3,
+  MAX_OBSTACLE_DUPLICATION: 2,
+  RESOURCE_TEMPLATE_ID: 'audio-resources',
+  SPEED: 6,
+  SPEED_DROP_COEFFICIENT: 3,
+  ARCADE_MODE_INITIAL_TOP_POSITION: 35,
+  ARCADE_MODE_TOP_POSITION_PERCENT: 0.1,
+};
+
+Runner.normalConfig = {
+  ACCELERATION: 0.001,
+  AUDIOCUE_PROXIMITY_THRESHOLD: 190,
+  AUDIOCUE_PROXIMITY_THRESHOLD_MOBILE_A11Y: 250,
+  GAP_COEFFICIENT: 0.6,
+  INVERT_DISTANCE: 700,
+  MAX_SPEED: 13,
+  MOBILE_SPEED_COEFFICIENT: 1.2,
+  SPEED: 6,
+};
+
+
+Runner.slowConfig = {
+  ACCELERATION: 0.0005,
+  AUDIOCUE_PROXIMITY_THRESHOLD: 170,
+  AUDIOCUE_PROXIMITY_THRESHOLD_MOBILE_A11Y: 220,
+  GAP_COEFFICIENT: 0.3,
+  INVERT_DISTANCE: 350,
+  MAX_SPEED: 9,
+  MOBILE_SPEED_COEFFICIENT: 1.5,
+  SPEED: 4.2,
+};
+
+
+/**
+ * Default dimensions.
+ */
+Runner.defaultDimensions = {
+  WIDTH: DEFAULT_WIDTH,
+  HEIGHT: 150,
+};
+
+
+/**
+ * CSS class names.
+ * @enum {string}
+ */
+Runner.classes = {
+  ARCADE_MODE: 'arcade-mode',
+  CANVAS: 'runner-canvas',
+  CONTAINER: 'runner-container',
+  CRASHED: 'crashed',
+  ICON: 'icon-offline',
+  INVERTED: 'inverted',
+  SNACKBAR: 'snackbar',
+  SNACKBAR_SHOW: 'snackbar-show',
+  TOUCH_CONTROLLER: 'controller',
+};
+
+
+/**
+ * Sound FX. Reference to the ID of the audio tag on interstitial page.
+ * @enum {string}
+ */
+Runner.sounds = {
+  BUTTON_PRESS: 'offline-sound-press',
+  HIT: 'offline-sound-hit',
+  SCORE: 'offline-sound-reached',
+};
+
+
+/**
+ * Key code mapping.
+ * @enum {Object}
+ */
+Runner.keycodes = {
+  JUMP: {'38': 1, '32': 1},  // Up, spacebar
+  DUCK: {'40': 1},           // Down
+  RESTART: {'13': 1},        // Enter
+};
+
+
+/**
+ * Runner event names.
+ * @enum {string}
+ */
+Runner.events = {
+  ANIM_END: 'webkitAnimationEnd',
+  CLICK: 'click',
+  KEYDOWN: 'keydown',
+  KEYUP: 'keyup',
+  POINTERDOWN: 'pointerdown',
+  POINTERUP: 'pointerup',
+  RESIZE: 'resize',
+  TOUCHEND: 'touchend',
+  TOUCHSTART: 'touchstart',
+  VISIBILITY: 'visibilitychange',
+  BLUR: 'blur',
+  FOCUS: 'focus',
+  LOAD: 'load',
+  GAMEPADCONNECTED: 'gamepadconnected',
+};
+
+Runner.prototype = {
+  /**
+   * Initialize alternative game type.
+   */
+  initAltGameType() {
+    if (GAME_TYPE.length > 0) {
+      this.gameType = loadTimeData && loadTimeData.valueExists('altGameType') ?
+          GAME_TYPE[parseInt(loadTimeData.getValue('altGameType'), 10) - 1] :
+          '';
+    }
+  },
+
+  /**
+   * Whether the easter egg has been disabled. CrOS enterprise enrolled devices.
+   * @return {boolean}
+   */
+  isDisabled() {
+    return loadTimeData && loadTimeData.valueExists('disabledEasterEgg');
+  },
+
+  /**
+   * For disabled instances, set up a snackbar with the disabled message.
+   */
+  setupDisabledRunner() {
+    this.containerEl = document.createElement('div');
+    this.containerEl.className = Runner.classes.SNACKBAR;
+    this.containerEl.textContent = loadTimeData.getValue('disabledEasterEgg');
+    this.outerContainerEl.appendChild(this.containerEl);
+
+    // Show notification when the activation key is pressed.
+    document.addEventListener(Runner.events.KEYDOWN, function(e) {
+      if (Runner.keycodes.JUMP[e.keyCode]) {
+        this.containerEl.classList.add(Runner.classes.SNACKBAR_SHOW);
+        document.querySelector('.icon').classList.add('icon-disabled');
+      }
+    }.bind(this));
+  },
+
+  /**
+   * Setting individual settings for debugging.
+   * @param {string} setting
+   * @param {number|string} value
+   */
+  updateConfigSetting(setting, value) {
+    if (setting in this.config && value !== undefined) {
+      this.config[setting] = value;
+
+      switch (setting) {
+        case 'GRAVITY':
+        case 'MIN_JUMP_HEIGHT':
+        case 'SPEED_DROP_COEFFICIENT':
+          this.tRex.config[setting] = value;
+          break;
+        case 'INITIAL_JUMP_VELOCITY':
+          this.tRex.setJumpVelocity(value);
+          break;
+        case 'SPEED':
+          this.setSpeed(/** @type {number} */ (value));
+          break;
+      }
+    }
+  },
+
+  /**
+   * Creates an on page image element from the base 64 encoded string source.
+   * @param {string} resourceName Name in data object,
+   * @return {HTMLImageElement} The created element.
+   */
+  createImageElement(resourceName) {
+    const imgSrc = loadTimeData && loadTimeData.valueExists(resourceName) ?
+        loadTimeData.getString(resourceName) :
+        null;
+
+    if (imgSrc) {
+      const el =
+          /** @type {HTMLImageElement} */ (document.createElement('img'));
+      el.id = resourceName;
+      el.src = imgSrc;
+      document.getElementById('offline-resources').appendChild(el);
+      return el;
+    }
+    return null;
+  },
+
+  /**
+   * Cache the appropriate image sprite from the page and get the sprite sheet
+   * definition.
+   */
+  loadImages() {
+    let scale = '1x';
+    this.spriteDef = Runner.spriteDefinition.LDPI;
+    if (IS_HIDPI) {
+      scale = '2x';
+      this.spriteDef = Runner.spriteDefinition.HDPI;
+    }
+
+    Runner.imageSprite = /** @type {HTMLImageElement} */
+        (document.getElementById(RESOURCE_POSTFIX + scale));
+
+    if (this.gameType) {
+      Runner.altGameImageSprite = /** @type {HTMLImageElement} */
+          (this.createImageElement('altGameSpecificImage' + scale));
+      Runner.altCommonImageSprite = /** @type {HTMLImageElement} */
+          (this.createImageElement('altGameCommonImage' + scale));
+    }
+    Runner.origImageSprite = Runner.imageSprite;
+
+    // Disable the alt game mode if the sprites can't be loaded.
+    if (!Runner.altGameImageSprite || !Runner.altCommonImageSprite) {
+      Runner.isAltGameModeEnabled = () => false;
+      this.altGameModeActive = false;
+    }
+
+    if (Runner.imageSprite.complete) {
+      this.init();
+    } else {
+      // If the images are not yet loaded, add a listener.
+      Runner.imageSprite.addEventListener(Runner.events.LOAD,
+          this.init.bind(this));
+    }
+  },
+
+  /**
+   * Load and decode base 64 encoded sounds.
+   */
+  loadSounds() {
+    if (!IS_IOS) {
+      this.audioContext = new AudioContext();
+
+      const resourceTemplate =
+          document.getElementById(this.config.RESOURCE_TEMPLATE_ID).content;
+
+      for (const sound in Runner.sounds) {
+        let soundSrc =
+            resourceTemplate.getElementById(Runner.sounds[sound]).src;
+        soundSrc = soundSrc.substr(soundSrc.indexOf(',') + 1);
+        const buffer = decodeBase64ToArrayBuffer(soundSrc);
+
+        // Async, so no guarantee of order in array.
+        this.audioContext.decodeAudioData(buffer, function(index, audioData) {
+            this.soundFx[index] = audioData;
+          }.bind(this, sound));
+      }
+    }
+  },
+
+  /**
+   * Sets the game speed. Adjust the speed accordingly if on a smaller screen.
+   * @param {number=} opt_speed
+   */
+  setSpeed(opt_speed) {
+    const speed = opt_speed || this.currentSpeed;
+
+    // Reduce the speed on smaller mobile screens.
+    if (this.dimensions.WIDTH < DEFAULT_WIDTH) {
+      const mobileSpeed = Runner.slowDown ? speed :
+                                            speed * this.dimensions.WIDTH /
+              DEFAULT_WIDTH * this.config.MOBILE_SPEED_COEFFICIENT;
+      this.currentSpeed = mobileSpeed > speed ? speed : mobileSpeed;
+    } else if (opt_speed) {
+      this.currentSpeed = opt_speed;
+    }
+  },
+
+  /**
+   * Game initialiser.
+   */
+  init() {
+    // Hide the static icon.
+    document.querySelector('.' + Runner.classes.ICON).style.visibility =
+        'hidden';
+
+    this.adjustDimensions();
+    this.setSpeed();
+
+    const ariaLabel = getA11yString(A11Y_STRINGS.ariaLabel);
+    this.containerEl = document.createElement('div');
+    this.containerEl.setAttribute('role', IS_MOBILE ? 'button' : 'application');
+    this.containerEl.setAttribute('tabindex', '0');
+    this.containerEl.setAttribute('title', ariaLabel);
+
+    this.containerEl.className = Runner.classes.CONTAINER;
+
+    // Player canvas container.
+    this.canvas = createCanvas(this.containerEl, this.dimensions.WIDTH,
+        this.dimensions.HEIGHT);
+
+    // Live region for game status updates.
+    this.a11yStatusEl = document.createElement('span');
+    this.a11yStatusEl.className = 'offline-runner-live-region';
+    this.a11yStatusEl.setAttribute('aria-live', 'assertive');
+    this.a11yStatusEl.textContent = '';
+    Runner.a11yStatusEl = this.a11yStatusEl;
+
+    // Add checkbox to slow down the game.
+    this.slowSpeedCheckboxLabel = document.createElement('label');
+    this.slowSpeedCheckboxLabel.className = 'slow-speed-option hidden';
+    this.slowSpeedCheckboxLabel.textContent =
+        getA11yString(A11Y_STRINGS.speedLabel);
+
+    this.slowSpeedCheckbox = document.createElement('input');
+    this.slowSpeedCheckbox.setAttribute('type', 'checkbox');
+    this.slowSpeedCheckbox.setAttribute(
+        'title', getA11yString(A11Y_STRINGS.speedLabel));
+    this.slowSpeedCheckbox.setAttribute('tabindex', '0');
+    this.slowSpeedCheckbox.setAttribute('checked', 'checked');
+
+    this.slowSpeedToggleEl = document.createElement('span');
+    this.slowSpeedToggleEl.className = 'slow-speed-toggle';
+
+    this.slowSpeedCheckboxLabel.appendChild(this.slowSpeedCheckbox);
+    this.slowSpeedCheckboxLabel.appendChild(this.slowSpeedToggleEl);
+
+    if (IS_IOS) {
+      this.outerContainerEl.appendChild(this.a11yStatusEl);
+    } else {
+      this.containerEl.appendChild(this.a11yStatusEl);
+    }
+
+    announcePhrase(getA11yString(A11Y_STRINGS.description));
+
+    this.generatedSoundFx = new GeneratedSoundFx();
+
+    this.canvasCtx =
+        /** @type {CanvasRenderingContext2D} */ (this.canvas.getContext('2d'));
+    this.canvasCtx.fillStyle = '#f7f7f7';
+    this.canvasCtx.fill();
+    Runner.updateCanvasScaling(this.canvas);
+
+    // Horizon contains clouds, obstacles and the ground.
+    this.horizon = new Horizon(this.canvas, this.spriteDef, this.dimensions,
+        this.config.GAP_COEFFICIENT);
+
+    // Distance meter
+    this.distanceMeter = new DistanceMeter(this.canvas,
+          this.spriteDef.TEXT_SPRITE, this.dimensions.WIDTH);
+
+    // Draw t-rex
+    this.tRex = new Trex(this.canvas, this.spriteDef.TREX);
+
+    this.outerContainerEl.appendChild(this.containerEl);
+    this.outerContainerEl.appendChild(this.slowSpeedCheckboxLabel);
+
+    this.startListening();
+    this.update();
+
+    window.addEventListener(Runner.events.RESIZE,
+        this.debounceResize.bind(this));
+
+    // Handle dark mode
+    const darkModeMediaQuery =
+        window.matchMedia('(prefers-color-scheme: dark)');
+    this.isDarkMode = darkModeMediaQuery && darkModeMediaQuery.matches;
+    darkModeMediaQuery.addListener((e) => {
+      this.isDarkMode = e.matches;
+    });
+  },
+
+  /**
+   * Create the touch controller. A div that covers whole screen.
+   */
+  createTouchController() {
+    this.touchController = document.createElement('div');
+    this.touchController.className = Runner.classes.TOUCH_CONTROLLER;
+    this.touchController.addEventListener(Runner.events.TOUCHSTART, this);
+    this.touchController.addEventListener(Runner.events.TOUCHEND, this);
+    this.outerContainerEl.appendChild(this.touchController);
+  },
+
+  /**
+   * Debounce the resize event.
+   */
+  debounceResize() {
+    if (!this.resizeTimerId_) {
+      this.resizeTimerId_ =
+          setInterval(this.adjustDimensions.bind(this), 250);
+    }
+  },
+
+  /**
+   * Adjust game space dimensions on resize.
+   */
+  adjustDimensions() {
+    clearInterval(this.resizeTimerId_);
+    this.resizeTimerId_ = null;
+
+    const boxStyles = window.getComputedStyle(this.outerContainerEl);
+    const padding = Number(boxStyles.paddingLeft.substr(0,
+        boxStyles.paddingLeft.length - 2));
+
+    this.dimensions.WIDTH = this.outerContainerEl.offsetWidth - padding * 2;
+    if (this.isArcadeMode()) {
+      this.dimensions.WIDTH = Math.min(DEFAULT_WIDTH, this.dimensions.WIDTH);
+      if (this.activated) {
+        this.setArcadeModeContainerScale();
+      }
+    }
+
+    // Redraw the elements back onto the canvas.
+    if (this.canvas) {
+      this.canvas.width = this.dimensions.WIDTH;
+      this.canvas.height = this.dimensions.HEIGHT;
+
+      Runner.updateCanvasScaling(this.canvas);
+
+      this.distanceMeter.calcXPos(this.dimensions.WIDTH);
+      this.clearCanvas();
+      this.horizon.update(0, 0, true);
+      this.tRex.update(0);
+
+      // Outer container and distance meter.
+      if (this.playing || this.crashed || this.paused) {
+        this.containerEl.style.width = this.dimensions.WIDTH + 'px';
+        this.containerEl.style.height = this.dimensions.HEIGHT + 'px';
+        this.distanceMeter.update(0, Math.ceil(this.distanceRan));
+        this.stop();
+      } else {
+        this.tRex.draw(0, 0);
+      }
+
+      // Game over panel.
+      if (this.crashed && this.gameOverPanel) {
+        this.gameOverPanel.updateDimensions(this.dimensions.WIDTH);
+        this.gameOverPanel.draw(this.altGameModeActive, this.tRex);
+      }
+    }
+  },
+
+  /**
+   * Play the game intro.
+   * Canvas container width expands out to the full width.
+   */
+  playIntro() {
+    if (!this.activated && !this.crashed) {
+      this.playingIntro = true;
+      this.tRex.playingIntro = true;
+
+      // CSS animation definition.
+      const keyframes = '@-webkit-keyframes intro { ' +
+            'from { width:' + Trex.config.WIDTH + 'px }' +
+            'to { width: ' + this.dimensions.WIDTH + 'px }' +
+          '}';
+      document.styleSheets[0].insertRule(keyframes, 0);
+
+      this.containerEl.addEventListener(Runner.events.ANIM_END,
+          this.startGame.bind(this));
+
+      this.containerEl.style.webkitAnimation = 'intro .4s ease-out 1 both';
+      this.containerEl.style.width = this.dimensions.WIDTH + 'px';
+
+      this.setPlayStatus(true);
+      this.activated = true;
+    } else if (this.crashed) {
+      this.restart();
+    }
+  },
+
+
+  /**
+   * Update the game status to started.
+   */
+  startGame() {
+    if (this.isArcadeMode()) {
+      this.setArcadeMode();
+    }
+    this.toggleSpeed();
+    this.runningTime = 0;
+    this.playingIntro = false;
+    this.tRex.playingIntro = false;
+    this.containerEl.style.webkitAnimation = '';
+    this.playCount++;
+    this.generatedSoundFx.background();
+    announcePhrase(getA11yString(A11Y_STRINGS.started));
+
+    if (Runner.audioCues) {
+      this.containerEl.setAttribute('title', getA11yString(A11Y_STRINGS.jump));
+    }
+
+    // Handle tabbing off the page. Pause the current game.
+    document.addEventListener(Runner.events.VISIBILITY,
+          this.onVisibilityChange.bind(this));
+
+    window.addEventListener(Runner.events.BLUR,
+          this.onVisibilityChange.bind(this));
+
+    window.addEventListener(Runner.events.FOCUS,
+          this.onVisibilityChange.bind(this));
+  },
+
+  clearCanvas() {
+    this.canvasCtx.clearRect(0, 0, this.dimensions.WIDTH,
+        this.dimensions.HEIGHT);
+  },
+
+  /**
+   * Checks whether the canvas area is in the viewport of the browser
+   * through the current scroll position.
+   * @return boolean.
+   */
+  isCanvasInView() {
+    return this.containerEl.getBoundingClientRect().top >
+        Runner.config.CANVAS_IN_VIEW_OFFSET;
+  },
+
+  /**
+   * Enable the alt game mode. Switching out the sprites.
+   */
+  enableAltGameMode() {
+    Runner.imageSprite = Runner.altGameImageSprite;
+    Runner.spriteDefinition = spriteDefinitionByType[Runner.gameType];
+
+    if (IS_HIDPI) {
+      this.spriteDef = Runner.spriteDefinition.HDPI;
+    } else {
+      this.spriteDef = Runner.spriteDefinition.LDPI;
+    }
+
+    this.altGameModeActive = true;
+    this.tRex.enableAltGameMode(this.spriteDef.TREX);
+    this.horizon.enableAltGameMode(this.spriteDef);
+    this.generatedSoundFx.background();
+  },
+
+  /**
+   * Update the game frame and schedules the next one.
+   */
+  update() {
+    this.updatePending = false;
+
+    const now = getTimeStamp();
+    let deltaTime = now - (this.time || now);
+
+    // Flashing when switching game modes.
+    if (this.altGameModeFlashTimer < 0 || this.altGameModeFlashTimer === 0) {
+      this.altGameModeFlashTimer = null;
+      this.tRex.setFlashing(false);
+      this.enableAltGameMode();
+    } else if (this.altGameModeFlashTimer > 0) {
+      this.altGameModeFlashTimer -= deltaTime;
+      this.tRex.update(deltaTime);
+      deltaTime = 0;
+    }
+
+    this.time = now;
+
+    if (this.playing) {
+      this.clearCanvas();
+
+      // Additional fade in - Prevents jump when switching sprites
+      if (this.altGameModeActive &&
+          this.fadeInTimer <= this.config.FADE_DURATION) {
+        this.fadeInTimer += deltaTime / 1000;
+        this.canvasCtx.globalAlpha = this.fadeInTimer;
+      } else {
+        this.canvasCtx.globalAlpha = 1;
+      }
+
+      if (this.tRex.jumping) {
+        this.tRex.updateJump(deltaTime);
+      }
+
+      this.runningTime += deltaTime;
+      const hasObstacles = this.runningTime > this.config.CLEAR_TIME;
+
+      // First jump triggers the intro.
+      if (this.tRex.jumpCount === 1 && !this.playingIntro) {
+        this.playIntro();
+      }
+
+      // The horizon doesn't move until the intro is over.
+      if (this.playingIntro) {
+        this.horizon.update(0, this.currentSpeed, hasObstacles);
+      } else if (!this.crashed) {
+        const showNightMode = this.isDarkMode ^ this.inverted;
+        deltaTime = !this.activated ? 0 : deltaTime;
+        this.horizon.update(
+            deltaTime, this.currentSpeed, hasObstacles, showNightMode);
+      }
+
+      // Check for collisions.
+      let collision = hasObstacles &&
+          checkForCollision(this.horizon.obstacles[0], this.tRex);
+
+      // For a11y, audio cues.
+      if (Runner.audioCues && hasObstacles) {
+        const jumpObstacle =
+            this.horizon.obstacles[0].typeConfig.type != 'COLLECTABLE';
+
+        if (!this.horizon.obstacles[0].jumpAlerted) {
+          const threshold = Runner.isMobileMouseInput ?
+              Runner.config.AUDIOCUE_PROXIMITY_THRESHOLD_MOBILE_A11Y :
+              Runner.config.AUDIOCUE_PROXIMITY_THRESHOLD;
+          const adjProximityThreshold = threshold +
+              (threshold * Math.log10(this.currentSpeed / Runner.config.SPEED));
+
+          if (this.horizon.obstacles[0].xPos < adjProximityThreshold) {
+            if (jumpObstacle) {
+              this.generatedSoundFx.jump();
+            }
+            this.horizon.obstacles[0].jumpAlerted = true;
+          }
+        }
+      }
+
+      // Activated alt game mode.
+      if (Runner.isAltGameModeEnabled() && collision &&
+          this.horizon.obstacles[0].typeConfig.type == 'COLLECTABLE') {
+        this.horizon.removeFirstObstacle();
+        this.tRex.setFlashing(true);
+        collision = false;
+        this.altGameModeFlashTimer = this.config.FLASH_DURATION;
+        this.runningTime = 0;
+        this.generatedSoundFx.collect();
+      }
+
+      if (!collision) {
+        this.distanceRan += this.currentSpeed * deltaTime / this.msPerFrame;
+
+        if (this.currentSpeed < this.config.MAX_SPEED) {
+          this.currentSpeed += this.config.ACCELERATION;
+        }
+      } else {
+        this.gameOver();
+      }
+
+      const playAchievementSound = this.distanceMeter.update(deltaTime,
+          Math.ceil(this.distanceRan));
+
+      if (!Runner.audioCues && playAchievementSound) {
+        this.playSound(this.soundFx.SCORE);
+      }
+
+      // Night mode.
+      if (!Runner.isAltGameModeEnabled()) {
+        if (this.invertTimer > this.config.INVERT_FADE_DURATION) {
+          this.invertTimer = 0;
+          this.invertTrigger = false;
+          this.invert(false);
+        } else if (this.invertTimer) {
+          this.invertTimer += deltaTime;
+        } else {
+          const actualDistance =
+              this.distanceMeter.getActualDistance(Math.ceil(this.distanceRan));
+
+          if (actualDistance > 0) {
+            this.invertTrigger =
+                !(actualDistance % this.config.INVERT_DISTANCE);
+
+            if (this.invertTrigger && this.invertTimer === 0) {
+              this.invertTimer += deltaTime;
+              this.invert(false);
+            }
+          }
+        }
+      }
+    }
+
+    if (this.playing || (!this.activated &&
+        this.tRex.blinkCount < Runner.config.MAX_BLINK_COUNT)) {
+      this.tRex.update(deltaTime);
+      this.scheduleNextUpdate();
+    }
+  },
+
+  /**
+   * Event handler.
+   * @param {Event} e
+   */
+  handleEvent(e) {
+    return (function(evtType, events) {
+      switch (evtType) {
+        case events.KEYDOWN:
+        case events.TOUCHSTART:
+        case events.POINTERDOWN:
+          this.onKeyDown(e);
+          break;
+        case events.KEYUP:
+        case events.TOUCHEND:
+        case events.POINTERUP:
+          this.onKeyUp(e);
+          break;
+        case events.GAMEPADCONNECTED:
+          this.onGamepadConnected(e);
+          break;
+      }
+    }.bind(this))(e.type, Runner.events);
+  },
+
+  /**
+   * Initialize audio cues if activated by focus on the canvas element.
+   * @param {Event} e
+   */
+  handleCanvasKeyPress(e) {
+    if (!this.activated && !Runner.audioCues) {
+      this.toggleSpeed();
+      Runner.audioCues = true;
+      this.generatedSoundFx.init();
+      Runner.generatedSoundFx = this.generatedSoundFx;
+      Runner.config.CLEAR_TIME *= 1.2;
+    } else if (e.keyCode && Runner.keycodes.JUMP[e.keyCode]) {
+      this.onKeyDown(e);
+    }
+  },
+
+  /**
+   * Prevent space key press from scrolling.
+   * @param {Event} e
+   */
+  preventScrolling(e) {
+    if (e.keyCode === 32) {
+      e.preventDefault();
+    }
+  },
+
+  /**
+   * Toggle speed setting if toggle is shown.
+   */
+  toggleSpeed() {
+    if (Runner.audioCues) {
+      const speedChange = Runner.slowDown != this.slowSpeedCheckbox.checked;
+
+      if (speedChange) {
+        Runner.slowDown = this.slowSpeedCheckbox.checked;
+        const updatedConfig =
+            Runner.slowDown ? Runner.slowConfig : Runner.normalConfig;
+
+        Runner.config = Object.assign(Runner.config, updatedConfig);
+        this.currentSpeed = updatedConfig.SPEED;
+        this.tRex.enableSlowConfig();
+        this.horizon.adjustObstacleSpeed();
+      }
+      if (this.playing) {
+        this.disableSpeedToggle(true);
+      }
+    }
+  },
+
+  /**
+   * Show the speed toggle.
+   * From focus event or when audio cues are activated.
+   * @param {Event=} e
+   */
+  showSpeedToggle(e) {
+    const isFocusEvent = e && e.type == 'focus';
+    if (Runner.audioCues || isFocusEvent) {
+      this.slowSpeedCheckboxLabel.classList.toggle(
+          HIDDEN_CLASS, isFocusEvent ? false : !this.crashed);
+    }
+  },
+
+  /**
+   * Disable the speed toggle.
+   * @param {boolean} disable
+   */
+  disableSpeedToggle(disable) {
+    if (disable) {
+      this.slowSpeedCheckbox.setAttribute('disabled', 'disabled');
+    } else {
+      this.slowSpeedCheckbox.removeAttribute('disabled');
+    }
+  },
+
+  /**
+   * Bind relevant key / mouse / touch listeners.
+   */
+  startListening() {
+    // A11y keyboard / screen reader activation.
+    this.containerEl.addEventListener(
+        Runner.events.KEYDOWN, this.handleCanvasKeyPress.bind(this));
+    if (!IS_MOBILE) {
+      this.containerEl.addEventListener(
+          Runner.events.FOCUS, this.showSpeedToggle.bind(this));
+    }
+    this.canvas.addEventListener(
+        Runner.events.KEYDOWN, this.preventScrolling.bind(this));
+    this.canvas.addEventListener(
+        Runner.events.KEYUP, this.preventScrolling.bind(this));
+
+    // Keys.
+    document.addEventListener(Runner.events.KEYDOWN, this);
+    document.addEventListener(Runner.events.KEYUP, this);
+
+    // Touch / pointer.
+    this.containerEl.addEventListener(Runner.events.TOUCHSTART, this);
+    document.addEventListener(Runner.events.POINTERDOWN, this);
+    document.addEventListener(Runner.events.POINTERUP, this);
+
+    if (this.isArcadeMode()) {
+      // Gamepad
+      window.addEventListener(Runner.events.GAMEPADCONNECTED, this);
+    }
+  },
+
+  /**
+   * Remove all listeners.
+   */
+  stopListening() {
+    document.removeEventListener(Runner.events.KEYDOWN, this);
+    document.removeEventListener(Runner.events.KEYUP, this);
+
+    if (this.touchController) {
+      this.touchController.removeEventListener(Runner.events.TOUCHSTART, this);
+      this.touchController.removeEventListener(Runner.events.TOUCHEND, this);
+    }
+
+    this.containerEl.removeEventListener(Runner.events.TOUCHSTART, this);
+    document.removeEventListener(Runner.events.POINTERDOWN, this);
+    document.removeEventListener(Runner.events.POINTERUP, this);
+
+    if (this.isArcadeMode()) {
+      window.removeEventListener(Runner.events.GAMEPADCONNECTED, this);
+    }
+  },
+
+  /**
+   * Process keydown.
+   * @param {Event} e
+   */
+  onKeyDown(e) {
+    // Prevent native page scrolling whilst tapping on mobile.
+    if (IS_MOBILE && this.playing) {
+      e.preventDefault();
+    }
+
+    if (this.isCanvasInView()) {
+      // Allow toggling of speed toggle.
+      if (Runner.keycodes.JUMP[e.keyCode] &&
+          e.target == this.slowSpeedCheckbox) {
+        return;
+      }
+
+      if (!this.crashed && !this.paused) {
+        // For a11y, screen reader activation.
+        const isMobileMouseInput = IS_MOBILE &&
+            e.type === Runner.events.POINTERDOWN && e.pointerType == 'mouse' &&
+            (e.target == this.containerEl ||
+             (IS_IOS &&
+              (e.target == this.touchController || e.target == this.canvas)));
+
+        if (Runner.keycodes.JUMP[e.keyCode] ||
+            e.type === Runner.events.TOUCHSTART || isMobileMouseInput) {
+          e.preventDefault();
+          // Starting the game for the first time.
+          if (!this.playing) {
+            // Started by touch so create a touch controller.
+            if (!this.touchController && e.type === Runner.events.TOUCHSTART) {
+              this.createTouchController();
+            }
+
+            if (isMobileMouseInput) {
+              this.handleCanvasKeyPress(e);
+            }
+            this.loadSounds();
+            this.setPlayStatus(true);
+            this.update();
+            if (window.errorPageController) {
+              errorPageController.trackEasterEgg();
+            }
+          }
+          // Start jump.
+          if (!this.tRex.jumping && !this.tRex.ducking) {
+            if (Runner.audioCues) {
+              this.generatedSoundFx.cancelFootSteps();
+            } else {
+              this.playSound(this.soundFx.BUTTON_PRESS);
+            }
+            this.tRex.startJump(this.currentSpeed);
+          }
+        } else if (this.playing && Runner.keycodes.DUCK[e.keyCode]) {
+          e.preventDefault();
+          if (this.tRex.jumping) {
+            // Speed drop, activated only when jump key is not pressed.
+            this.tRex.setSpeedDrop();
+          } else if (!this.tRex.jumping && !this.tRex.ducking) {
+            // Duck.
+            this.tRex.setDuck(true);
+          }
+        }
+      }
+    }
+  },
+
+  /**
+   * Process key up.
+   * @param {Event} e
+   */
+  onKeyUp(e) {
+    const keyCode = String(e.keyCode);
+    const isjumpKey = Runner.keycodes.JUMP[keyCode] ||
+        e.type === Runner.events.TOUCHEND || e.type === Runner.events.POINTERUP;
+
+    if (this.isRunning() && isjumpKey) {
+      this.tRex.endJump();
+    } else if (Runner.keycodes.DUCK[keyCode]) {
+      this.tRex.speedDrop = false;
+      this.tRex.setDuck(false);
+    } else if (this.crashed) {
+      // Check that enough time has elapsed before allowing jump key to restart.
+      const deltaTime = getTimeStamp() - this.time;
+
+      if (this.isCanvasInView() &&
+          (Runner.keycodes.RESTART[keyCode] || this.isLeftClickOnCanvas(e) ||
+          (deltaTime >= this.config.GAMEOVER_CLEAR_TIME &&
+          Runner.keycodes.JUMP[keyCode]))) {
+        this.handleGameOverClicks(e);
+      }
+    } else if (this.paused && isjumpKey) {
+      // Reset the jump state
+      this.tRex.reset();
+      this.play();
+    }
+  },
+
+  /**
+   * Process gamepad connected event.
+   * @param {Event} e
+   */
+  onGamepadConnected(e) {
+    if (!this.pollingGamepads) {
+      this.pollGamepadState();
+    }
+  },
+
+  /**
+   * rAF loop for gamepad polling.
+   */
+  pollGamepadState() {
+    const gamepads = navigator.getGamepads();
+    this.pollActiveGamepad(gamepads);
+
+    this.pollingGamepads = true;
+    requestAnimationFrame(this.pollGamepadState.bind(this));
+  },
+
+  /**
+   * Polls for a gamepad with the jump button pressed. If one is found this
+   * becomes the "active" gamepad and all others are ignored.
+   * @param {!Array<Gamepad>} gamepads
+   */
+  pollForActiveGamepad(gamepads) {
+    for (let i = 0; i < gamepads.length; ++i) {
+      if (gamepads[i] && gamepads[i].buttons.length > 0 &&
+          gamepads[i].buttons[0].pressed) {
+        this.gamepadIndex = i;
+        this.pollActiveGamepad(gamepads);
+        return;
+      }
+    }
+  },
+
+  /**
+   * Polls the chosen gamepad for button presses and generates KeyboardEvents
+   * to integrate with the rest of the game logic.
+   * @param {!Array<Gamepad>} gamepads
+   */
+  pollActiveGamepad(gamepads) {
+    if (this.gamepadIndex === undefined) {
+      this.pollForActiveGamepad(gamepads);
+      return;
+    }
+
+    const gamepad = gamepads[this.gamepadIndex];
+    if (!gamepad) {
+      this.gamepadIndex = undefined;
+      this.pollForActiveGamepad(gamepads);
+      return;
+    }
+
+    // The gamepad specification defines the typical mapping of physical buttons
+    // to button indicies: https://w3c.github.io/gamepad/#remapping
+    this.pollGamepadButton(gamepad, 0, 38);  // Jump
+    if (gamepad.buttons.length >= 2) {
+      this.pollGamepadButton(gamepad, 1, 40);  // Duck
+    }
+    if (gamepad.buttons.length >= 10) {
+      this.pollGamepadButton(gamepad, 9, 13);  // Restart
+    }
+
+    this.previousGamepad = gamepad;
+  },
+
+  /**
+   * Generates a key event based on a gamepad button.
+   * @param {!Gamepad} gamepad
+   * @param {number} buttonIndex
+   * @param {number} keyCode
+   */
+  pollGamepadButton(gamepad, buttonIndex, keyCode) {
+    const state = gamepad.buttons[buttonIndex].pressed;
+    let previousState = false;
+    if (this.previousGamepad) {
+      previousState = this.previousGamepad.buttons[buttonIndex].pressed;
+    }
+    // Generate key events on the rising and falling edge of a button press.
+    if (state !== previousState) {
+      const e = new KeyboardEvent(state ? Runner.events.KEYDOWN
+                                      : Runner.events.KEYUP,
+                                { keyCode: keyCode });
+      document.dispatchEvent(e);
+    }
+  },
+
+  /**
+   * Handle interactions on the game over screen state.
+   * A user is able to tap the high score twice to reset it.
+   * @param {Event} e
+   */
+  handleGameOverClicks(e) {
+    if (e.target != this.slowSpeedCheckbox) {
+      e.preventDefault();
+      if (this.distanceMeter.hasClickedOnHighScore(e) && this.highestScore) {
+        if (this.distanceMeter.isHighScoreFlashing()) {
+          // Subsequent click, reset the high score.
+          this.saveHighScore(0, true);
+          this.distanceMeter.resetHighScore();
+        } else {
+          // First click, flash the high score.
+          this.distanceMeter.startHighScoreFlashing();
+        }
+      } else {
+        this.distanceMeter.cancelHighScoreFlashing();
+        this.restart();
+      }
+    }
+  },
+
+  /**
+   * Returns whether the event was a left click on canvas.
+   * On Windows right click is registered as a click.
+   * @param {Event} e
+   * @return {boolean}
+   */
+  isLeftClickOnCanvas(e) {
+    return e.button != null && e.button < 2 &&
+        e.type === Runner.events.POINTERUP &&
+        (e.target === this.canvas ||
+         (IS_MOBILE && Runner.audioCues && e.target === this.containerEl));
+  },
+
+  /**
+   * RequestAnimationFrame wrapper.
+   */
+  scheduleNextUpdate() {
+    if (!this.updatePending) {
+      this.updatePending = true;
+      this.raqId = requestAnimationFrame(this.update.bind(this));
+    }
+  },
+
+  /**
+   * Whether the game is running.
+   * @return {boolean}
+   */
+  isRunning() {
+    return !!this.raqId;
+  },
+
+  /**
+   * Set the initial high score as stored in the user's profile.
+   * @param {number} highScore
+   */
+  initializeHighScore(highScore) {
+    this.syncHighestScore = true;
+    highScore = Math.ceil(highScore);
+    if (highScore < this.highestScore) {
+      if (window.errorPageController) {
+        errorPageController.updateEasterEggHighScore(this.highestScore);
+      }
+      return;
+    }
+    this.highestScore = highScore;
+    this.distanceMeter.setHighScore(this.highestScore);
+  },
+
+  /**
+   * Sets the current high score and saves to the profile if available.
+   * @param {number} distanceRan Total distance ran.
+   * @param {boolean=} opt_resetScore Whether to reset the score.
+   */
+  saveHighScore(distanceRan, opt_resetScore) {
+    this.highestScore = Math.ceil(distanceRan);
+    this.distanceMeter.setHighScore(this.highestScore);
+
+    // Store the new high score in the profile.
+    if (this.syncHighestScore && window.errorPageController) {
+      if (opt_resetScore) {
+        errorPageController.resetEasterEggHighScore();
+      } else {
+        errorPageController.updateEasterEggHighScore(this.highestScore);
+      }
+    }
+  },
+
+  /**
+   * Game over state.
+   */
+  gameOver() {
+    this.playSound(this.soundFx.HIT);
+    vibrate(200);
+
+    this.stop();
+    this.crashed = true;
+    this.distanceMeter.achievement = false;
+
+    this.tRex.update(100, Trex.status.CRASHED);
+
+    // Game over panel.
+    if (!this.gameOverPanel) {
+      const origSpriteDef = IS_HIDPI ? spriteDefinitionByType.original.HDPI :
+                                       spriteDefinitionByType.original.LDPI;
+
+      if (this.canvas) {
+        if (Runner.isAltGameModeEnabled) {
+          this.gameOverPanel = new GameOverPanel(
+              this.canvas, origSpriteDef.TEXT_SPRITE, origSpriteDef.RESTART,
+              this.dimensions, origSpriteDef.ALT_GAME_END,
+              this.altGameModeActive);
+        } else {
+          this.gameOverPanel = new GameOverPanel(
+              this.canvas, origSpriteDef.TEXT_SPRITE, origSpriteDef.RESTART,
+              this.dimensions);
+        }
+      }
+    }
+
+    this.gameOverPanel.draw(this.altGameModeActive, this.tRex);
+
+    // Update the high score.
+    if (this.distanceRan > this.highestScore) {
+      this.saveHighScore(this.distanceRan);
+    }
+
+    // Reset the time clock.
+    this.time = getTimeStamp();
+
+    if (Runner.audioCues) {
+      this.generatedSoundFx.stopAll();
+      announcePhrase(
+          getA11yString(A11Y_STRINGS.gameOver)
+              .replace(
+                  '$1',
+                  this.distanceMeter.getActualDistance(this.distanceRan)
+                      .toString()) +
+          ' ' +
+          getA11yString(A11Y_STRINGS.highScore)
+              .replace(
+                  '$1',
+
+                  this.distanceMeter.getActualDistance(this.highestScore)
+                      .toString()));
+      this.containerEl.setAttribute(
+          'title', getA11yString(A11Y_STRINGS.ariaLabel));
+    }
+    this.showSpeedToggle();
+    this.disableSpeedToggle(false);
+  },
+
+  stop() {
+    this.setPlayStatus(false);
+    this.paused = true;
+    cancelAnimationFrame(this.raqId);
+    this.raqId = 0;
+    this.generatedSoundFx.stopAll();
+  },
+
+  play() {
+    if (!this.crashed) {
+      this.setPlayStatus(true);
+      this.paused = false;
+      this.tRex.update(0, Trex.status.RUNNING);
+      this.time = getTimeStamp();
+      this.update();
+      this.generatedSoundFx.background();
+    }
+  },
+
+  restart() {
+    if (!this.raqId) {
+      this.playCount++;
+      this.runningTime = 0;
+      this.setPlayStatus(true);
+      this.toggleSpeed();
+      this.paused = false;
+      this.crashed = false;
+      this.distanceRan = 0;
+      this.setSpeed(this.config.SPEED);
+      this.time = getTimeStamp();
+      this.containerEl.classList.remove(Runner.classes.CRASHED);
+      this.clearCanvas();
+      this.distanceMeter.reset();
+      this.horizon.reset();
+      this.tRex.reset();
+      this.playSound(this.soundFx.BUTTON_PRESS);
+      this.invert(true);
+      this.flashTimer = null;
+      this.update();
+      this.gameOverPanel.reset();
+      this.generatedSoundFx.background();
+      this.containerEl.setAttribute('title', getA11yString(A11Y_STRINGS.jump));
+      announcePhrase(getA11yString(A11Y_STRINGS.started));
+    }
+  },
+
+  setPlayStatus(isPlaying) {
+    if (this.touchController) {
+      this.touchController.classList.toggle(HIDDEN_CLASS, !isPlaying);
+    }
+    this.playing = isPlaying;
+  },
+
+  /**
+   * Whether the game should go into arcade mode.
+   * @return {boolean}
+   */
+  isArcadeMode() {
+    // In RTL languages the title is wrapped with the left to right mark
+    // control characters &#x202A; and &#x202C but are invisible.
+    return IS_RTL ? document.title.indexOf(ARCADE_MODE_URL) == 1 :
+                    document.title === ARCADE_MODE_URL;
+  },
+
+  /**
+   * Hides offline messaging for a fullscreen game only experience.
+   */
+  setArcadeMode() {
+    document.body.classList.add(Runner.classes.ARCADE_MODE);
+    this.setArcadeModeContainerScale();
+  },
+
+  /**
+   * Sets the scaling for arcade mode.
+   */
+  setArcadeModeContainerScale() {
+    const windowHeight = window.innerHeight;
+    const scaleHeight = windowHeight / this.dimensions.HEIGHT;
+    const scaleWidth = window.innerWidth / this.dimensions.WIDTH;
+    const scale = Math.max(1, Math.min(scaleHeight, scaleWidth));
+    const scaledCanvasHeight = this.dimensions.HEIGHT * scale;
+    // Positions the game container at 10% of the available vertical window
+    // height minus the game container height.
+    const translateY = Math.ceil(Math.max(0, (windowHeight - scaledCanvasHeight -
+        Runner.config.ARCADE_MODE_INITIAL_TOP_POSITION) *
+        Runner.config.ARCADE_MODE_TOP_POSITION_PERCENT)) *
+        window.devicePixelRatio;
+
+    const cssScale = IS_RTL ? -scale + ',' + scale : scale;
+    this.containerEl.style.transform =
+        'scale(' + cssScale + ') translateY(' + translateY + 'px)';
+  },
+
+  /**
+   * Pause the game if the tab is not in focus.
+   */
+  onVisibilityChange(e) {
+    if (document.hidden || document.webkitHidden || e.type === 'blur' ||
+        document.visibilityState !== 'visible') {
+      this.stop();
+    } else if (!this.crashed) {
+      this.tRex.reset();
+      this.play();
+    }
+  },
+
+  /**
+   * Play a sound.
+   * @param {AudioBuffer} soundBuffer
+   */
+  playSound(soundBuffer) {
+    if (soundBuffer) {
+      const sourceNode = this.audioContext.createBufferSource();
+      sourceNode.buffer = soundBuffer;
+      sourceNode.connect(this.audioContext.destination);
+      sourceNode.start(0);
+    }
+  },
+
+  /**
+   * Inverts the current page / canvas colors.
+   * @param {boolean} reset Whether to reset colors.
+   */
+  invert(reset) {
+    const htmlEl = document.firstElementChild;
+
+    if (reset) {
+      htmlEl.classList.toggle(Runner.classes.INVERTED,
+          false);
+      this.invertTimer = 0;
+      this.inverted = false;
+    } else {
+      this.inverted = htmlEl.classList.toggle(
+          Runner.classes.INVERTED, this.invertTrigger);
+    }
+  },
+};
+
+
+/**
+ * Updates the canvas size taking into
+ * account the backing store pixel ratio and
+ * the device pixel ratio.
+ *
+ * See article by Paul Lewis:
+ * http://www.html5rocks.com/en/tutorials/canvas/hidpi/
+ *
+ * @param {HTMLCanvasElement} canvas
+ * @param {number=} opt_width
+ * @param {number=} opt_height
+ * @return {boolean} Whether the canvas was scaled.
+ */
+Runner.updateCanvasScaling = function(canvas, opt_width, opt_height) {
+  const context =
+      /** @type {CanvasRenderingContext2D} */ (canvas.getContext('2d'));
+
+  // Query the various pixel ratios
+  const devicePixelRatio = Math.floor(window.devicePixelRatio) || 1;
+  /** @suppress {missingProperties} */
+  const backingStoreRatio =
+      Math.floor(context.webkitBackingStorePixelRatio) || 1;
+  const ratio = devicePixelRatio / backingStoreRatio;
+
+  // Upscale the canvas if the two ratios don't match
+  if (devicePixelRatio !== backingStoreRatio) {
+    const oldWidth = opt_width || canvas.width;
+    const oldHeight = opt_height || canvas.height;
+
+    canvas.width = oldWidth * ratio;
+    canvas.height = oldHeight * ratio;
+
+    canvas.style.width = oldWidth + 'px';
+    canvas.style.height = oldHeight + 'px';
+
+    // Scale the context to counter the fact that we've manually scaled
+    // our canvas element.
+    context.scale(ratio, ratio);
+    return true;
+  } else if (devicePixelRatio === 1) {
+    // Reset the canvas width / height. Fixes scaling bug when the page is
+    // zoomed and the devicePixelRatio changes accordingly.
+    canvas.style.width = canvas.width + 'px';
+    canvas.style.height = canvas.height + 'px';
+  }
+  return false;
+};
+
+
+/**
+ * Whether events are enabled.
+ * @return {boolean}
+ */
+Runner.isAltGameModeEnabled = function() {
+  return loadTimeData && loadTimeData.valueExists('enableAltGameMode');
+};
+
+
+/**
+ * Generated sound FX class for audio cues.
+ * @constructor
+ */
+function GeneratedSoundFx() {
+  this.audioCues = false;
+  this.context = null;
+  this.panner = null;
+}
+
+GeneratedSoundFx.prototype = {
+  init() {
+    this.audioCues = true;
+    if (!this.context) {
+      // iOS only supports the webkit version.
+      this.context = window.webkitAudioContext ? new webkitAudioContext() :
+                                                 new AudioContext();
+      if (IS_IOS) {
+        this.context.onstatechange = (function() {
+                                       if (this.context.state != 'running') {
+                                         this.context.resume();
+                                       }
+                                     }).bind(this);
+        this.context.resume();
+      }
+      this.panner = this.context.createStereoPanner ?
+          this.context.createStereoPanner() :
+          null;
+    }
+  },
+
+  stopAll() {
+    this.cancelFootSteps();
+  },
+
+  /**
+   * Play oscillators at certain frequency and for a certain time.
+   * @param {number} frequency
+   * @param {number} startTime
+   * @param {number} duration
+   * @param {?number=} opt_vol
+   * @param {number=} opt_pan
+   */
+  playNote(frequency, startTime, duration, opt_vol, opt_pan) {
+    const osc1 = this.context.createOscillator();
+    const osc2 = this.context.createOscillator();
+    const volume = this.context.createGain();
+
+    // Set oscillator wave type
+    osc1.type = 'triangle';
+    osc2.type = 'triangle';
+    volume.gain.value = 0.1;
+
+    // Set up node routing
+    if (this.panner) {
+      this.panner.pan.value = opt_pan || 0;
+      osc1.connect(volume).connect(this.panner);
+      osc2.connect(volume).connect(this.panner);
+      this.panner.connect(this.context.destination);
+    } else {
+      osc1.connect(volume);
+      osc2.connect(volume);
+      volume.connect(this.context.destination);
+    }
+
+    // Detune oscillators for chorus effect
+    osc1.frequency.value = frequency + 1;
+    osc2.frequency.value = frequency - 2;
+
+    // Fade out
+    volume.gain.setValueAtTime(opt_vol || 0.01, startTime + duration - 0.05);
+    volume.gain.linearRampToValueAtTime(0.00001, startTime + duration);
+
+    // Start oscillators
+    osc1.start(startTime);
+    osc2.start(startTime);
+    // Stop oscillators
+    osc1.stop(startTime + duration);
+    osc2.stop(startTime + duration);
+  },
+
+  background() {
+    if (this.audioCues) {
+      const now = this.context.currentTime;
+      this.playNote(493.883, now, 0.116);
+      this.playNote(659.255, now + 0.116, 0.232);
+      this.loopFootSteps();
+    }
+  },
+
+  loopFootSteps() {
+    if (this.audioCues && !this.bgSoundIntervalId) {
+      this.bgSoundIntervalId = setInterval(function() {
+        this.playNote(73.42, this.context.currentTime, 0.05, 0.16);
+        this.playNote(69.30, this.context.currentTime + 0.116, 0.116, 0.16);
+      }.bind(this), 280);
+    }
+  },
+
+  cancelFootSteps() {
+    if (this.audioCues && this.bgSoundIntervalId) {
+      clearInterval(this.bgSoundIntervalId);
+      this.bgSoundIntervalId = null;
+      this.playNote(103.83, this.context.currentTime, 0.232, 0.02);
+      this.playNote(116.54, this.context.currentTime + 0.116, 0.232, 0.02);
+    }
+  },
+
+  collect() {
+    if (this.audioCues) {
+      this.cancelFootSteps();
+      const now = this.context.currentTime;
+      this.playNote(830.61, now, 0.116);
+      this.playNote(1318.51, now + 0.116, 0.232);
+    }
+  },
+
+  jump() {
+    if (this.audioCues) {
+      const now = this.context.currentTime;
+      this.playNote(659.25, now, 0.116, 0.3, -0.6);
+      this.playNote(880, now + 0.116, 0.232, 0.3, -0.6);
+    }
+  },
+};
+
+
+/**
+ * For screen readers make an announcement to the live region.
+ * @param {string} phrase Sentence to speak.
+ */
+function announcePhrase(phrase) {
+  if (Runner.a11yStatusEl) {
+    Runner.a11yStatusEl.textContent = '';
+    Runner.a11yStatusEl.textContent = phrase;
+  }
+}
+
+
+/**
+ * Returns a string from loadTimeData data object.
+ * @param {string} stringName
+ * @return {string}
+ */
+function getA11yString(stringName) {
+  return loadTimeData && loadTimeData.valueExists(stringName) ?
+      loadTimeData.getString(stringName) :
+      '';
+}
+
+
+/**
+ * Get random number.
+ * @param {number} min
+ * @param {number} max
+ */
+function getRandomNum(min, max) {
+  return Math.floor(Math.random() * (max - min + 1)) + min;
+}
+
+
+/**
+ * Vibrate on mobile devices.
+ * @param {number} duration Duration of the vibration in milliseconds.
+ */
+function vibrate(duration) {
+  if (IS_MOBILE && window.navigator.vibrate) {
+    window.navigator.vibrate(duration);
+  }
+}
+
+
+/**
+ * Create canvas element.
+ * @param {Element} container Element to append canvas to.
+ * @param {number} width
+ * @param {number} height
+ * @param {string=} opt_classname
+ * @return {HTMLCanvasElement}
+ */
+function createCanvas(container, width, height, opt_classname) {
+  const canvas =
+      /** @type {!HTMLCanvasElement} */ (document.createElement('canvas'));
+  canvas.className = opt_classname ? Runner.classes.CANVAS + ' ' +
+      opt_classname : Runner.classes.CANVAS;
+  canvas.width = width;
+  canvas.height = height;
+  container.appendChild(canvas);
+
+  return canvas;
+}
+
+
+/**
+ * Decodes the base 64 audio to ArrayBuffer used by Web Audio.
+ * @param {string} base64String
+ */
+function decodeBase64ToArrayBuffer(base64String) {
+  const len = (base64String.length / 4) * 3;
+  const str = atob(base64String);
+  const arrayBuffer = new ArrayBuffer(len);
+  const bytes = new Uint8Array(arrayBuffer);
+
+  for (let i = 0; i < len; i++) {
+    bytes[i] = str.charCodeAt(i);
+  }
+  return bytes.buffer;
+}
+
+
+/**
+ * Return the current timestamp.
+ * @return {number}
+ */
+function getTimeStamp() {
+  return IS_IOS ? new Date().getTime() : performance.now();
+}
+
+
+//******************************************************************************
+
+
+/**
+ * Game over panel.
+ * @param {!HTMLCanvasElement} canvas
+ * @param {Object} textImgPos
+ * @param {Object} restartImgPos
+ * @param {!Object} dimensions Canvas dimensions.
+ * @param {Object=} opt_altGameEndImgPos
+ * @param {boolean=} opt_altGameActive
+ * @constructor
+ */
+function GameOverPanel(
+    canvas, textImgPos, restartImgPos, dimensions, opt_altGameEndImgPos,
+    opt_altGameActive) {
+  this.canvas = canvas;
+  this.canvasCtx =
+      /** @type {CanvasRenderingContext2D} */ (canvas.getContext('2d'));
+  this.canvasDimensions = dimensions;
+  this.textImgPos = textImgPos;
+  this.restartImgPos = restartImgPos;
+  this.altGameEndImgPos = opt_altGameEndImgPos;
+  this.altGameModeActive = opt_altGameActive;
+
+  // Retry animation.
+  this.frameTimeStamp = 0;
+  this.animTimer = 0;
+  this.currentFrame = 0;
+
+  this.gameOverRafId = null;
+
+  this.flashTimer = 0;
+  this.flashCounter = 0;
+  this.originalText = true;
+}
+
+GameOverPanel.RESTART_ANIM_DURATION = 875;
+GameOverPanel.LOGO_PAUSE_DURATION = 875;
+GameOverPanel.FLASH_ITERATIONS = 5;
+
+/**
+ * Animation frames spec.
+ */
+GameOverPanel.animConfig = {
+  frames: [0, 36, 72, 108, 144, 180, 216, 252],
+  msPerFrame: GameOverPanel.RESTART_ANIM_DURATION / 8,
+};
+
+/**
+ * Dimensions used in the panel.
+ * @enum {number}
+ */
+GameOverPanel.dimensions = {
+  TEXT_X: 0,
+  TEXT_Y: 13,
+  TEXT_WIDTH: 191,
+  TEXT_HEIGHT: 11,
+  RESTART_WIDTH: 36,
+  RESTART_HEIGHT: 32,
+};
+
+
+GameOverPanel.prototype = {
+  /**
+   * Update the panel dimensions.
+   * @param {number} width New canvas width.
+   * @param {number} opt_height Optional new canvas height.
+   */
+  updateDimensions(width, opt_height) {
+    this.canvasDimensions.WIDTH = width;
+    if (opt_height) {
+      this.canvasDimensions.HEIGHT = opt_height;
+    }
+    this.currentFrame = GameOverPanel.animConfig.frames.length - 1;
+  },
+
+  drawGameOverText(dimensions, opt_useAltText) {
+    const centerX = this.canvasDimensions.WIDTH / 2;
+    let textSourceX = dimensions.TEXT_X;
+    let textSourceY = dimensions.TEXT_Y;
+    let textSourceWidth = dimensions.TEXT_WIDTH;
+    let textSourceHeight = dimensions.TEXT_HEIGHT;
+
+    const textTargetX = Math.round(centerX - (dimensions.TEXT_WIDTH / 2));
+    const textTargetY = Math.round((this.canvasDimensions.HEIGHT - 25) / 3);
+    const textTargetWidth = dimensions.TEXT_WIDTH;
+    const textTargetHeight = dimensions.TEXT_HEIGHT;
+
+    if (IS_HIDPI) {
+      textSourceY *= 2;
+      textSourceX *= 2;
+      textSourceWidth *= 2;
+      textSourceHeight *= 2;
+    }
+
+    if (!opt_useAltText) {
+      textSourceX += this.textImgPos.x;
+      textSourceY += this.textImgPos.y;
+    }
+
+    const spriteSource =
+        opt_useAltText ? Runner.altCommonImageSprite : Runner.origImageSprite;
+
+    this.canvasCtx.save();
+
+    if (IS_RTL) {
+      this.canvasCtx.translate(this.canvasDimensions.WIDTH, 0);
+      this.canvasCtx.scale(-1, 1);
+    }
+
+    // Game over text from sprite.
+    this.canvasCtx.drawImage(
+        spriteSource, textSourceX, textSourceY, textSourceWidth,
+        textSourceHeight, textTargetX, textTargetY, textTargetWidth,
+        textTargetHeight);
+
+    this.canvasCtx.restore();
+  },
+
+  /**
+   * Draw additional adornments for alternative game types.
+   */
+  drawAltGameElements(tRex) {
+    // Additional adornments.
+    if (this.altGameModeActive && Runner.spriteDefinition.ALT_GAME_END_CONFIG) {
+      const altGameEndConfig = Runner.spriteDefinition.ALT_GAME_END_CONFIG;
+
+      let altGameEndSourceWidth = altGameEndConfig.WIDTH;
+      let altGameEndSourceHeight = altGameEndConfig.HEIGHT;
+      const altGameEndTargetX = tRex.xPos + altGameEndConfig.X_OFFSET;
+      const altGameEndTargetY = tRex.yPos + altGameEndConfig.Y_OFFSET;
+
+      if (IS_HIDPI) {
+        altGameEndSourceWidth *= 2;
+        altGameEndSourceHeight *= 2;
+      }
+
+      this.canvasCtx.drawImage(
+          Runner.altCommonImageSprite, this.altGameEndImgPos.x,
+          this.altGameEndImgPos.y, altGameEndSourceWidth,
+          altGameEndSourceHeight, altGameEndTargetX, altGameEndTargetY,
+          altGameEndConfig.WIDTH, altGameEndConfig.HEIGHT);
+    }
+  },
+
+  /**
+   * Draw restart button.
+   */
+  drawRestartButton() {
+    const dimensions = GameOverPanel.dimensions;
+    let framePosX = GameOverPanel.animConfig.frames[this.currentFrame];
+    let restartSourceWidth = dimensions.RESTART_WIDTH;
+    let restartSourceHeight = dimensions.RESTART_HEIGHT;
+    const restartTargetX =
+        (this.canvasDimensions.WIDTH / 2) - (dimensions.RESTART_WIDTH / 2);
+    const restartTargetY = this.canvasDimensions.HEIGHT / 2;
+
+    if (IS_HIDPI) {
+      restartSourceWidth *= 2;
+      restartSourceHeight *= 2;
+      framePosX *= 2;
+    }
+
+    this.canvasCtx.save();
+
+    if (IS_RTL) {
+      this.canvasCtx.translate(this.canvasDimensions.WIDTH, 0);
+      this.canvasCtx.scale(-1, 1);
+    }
+
+    this.canvasCtx.drawImage(
+        Runner.origImageSprite, this.restartImgPos.x + framePosX,
+        this.restartImgPos.y, restartSourceWidth, restartSourceHeight,
+        restartTargetX, restartTargetY, dimensions.RESTART_WIDTH,
+        dimensions.RESTART_HEIGHT);
+    this.canvasCtx.restore();
+  },
+
+
+  /**
+   * Draw the panel.
+   * @param {boolean} opt_altGameModeActive
+   * @param {!Trex} opt_tRex
+   */
+  draw(opt_altGameModeActive, opt_tRex) {
+    if (opt_altGameModeActive) {
+      this.altGameModeActive = opt_altGameModeActive;
+    }
+
+    this.drawGameOverText(GameOverPanel.dimensions, false);
+    this.drawRestartButton();
+    this.drawAltGameElements(opt_tRex);
+    this.update();
+  },
+
+  /**
+   * Update animation frames.
+   */
+  update() {
+    const now = getTimeStamp();
+    const deltaTime = now - (this.frameTimeStamp || now);
+
+    this.frameTimeStamp = now;
+    this.animTimer += deltaTime;
+    this.flashTimer += deltaTime;
+
+    // Restart Button
+    if (this.currentFrame == 0 &&
+        this.animTimer > GameOverPanel.LOGO_PAUSE_DURATION) {
+      this.animTimer = 0;
+      this.currentFrame++;
+      this.drawRestartButton();
+    } else if (
+        this.currentFrame > 0 &&
+        this.currentFrame < GameOverPanel.animConfig.frames.length) {
+      if (this.animTimer >= GameOverPanel.animConfig.msPerFrame) {
+        this.currentFrame++;
+        this.drawRestartButton();
+      }
+    } else if (
+        !this.altGameModeActive &&
+        this.currentFrame == GameOverPanel.animConfig.frames.length) {
+      this.reset();
+      return;
+    }
+
+    // Game over text
+    if (this.altGameModeActive &&
+        spriteDefinitionByType.original.ALT_GAME_OVER_TEXT_CONFIG) {
+      const altTextConfig =
+          spriteDefinitionByType.original.ALT_GAME_OVER_TEXT_CONFIG;
+
+      if (altTextConfig.FLASHING) {
+        if (this.flashCounter < GameOverPanel.FLASH_ITERATIONS &&
+            this.flashTimer > altTextConfig.FLASH_DURATION) {
+          this.flashTimer = 0;
+          this.originalText = !this.originalText;
+
+          this.clearGameOverTextBounds();
+          if (this.originalText) {
+            this.drawGameOverText(GameOverPanel.dimensions, false);
+            this.flashCounter++;
+          } else {
+            this.drawGameOverText(altTextConfig, true);
+          }
+        } else if (this.flashCounter >= GameOverPanel.FLASH_ITERATIONS) {
+          this.reset();
+          return;
+        }
+      } else {
+        this.clearGameOverTextBounds(altTextConfig);
+        this.drawGameOverText(altTextConfig, true);
+      }
+    }
+
+    this.gameOverRafId = requestAnimationFrame(this.update.bind(this));
+  },
+
+  /**
+   * Clear game over text.
+   * @param {Object} dimensions Game over text config.
+   */
+  clearGameOverTextBounds(dimensions) {
+    this.canvasCtx.save();
+
+    this.canvasCtx.clearRect(
+        Math.round(
+            this.canvasDimensions.WIDTH / 2 - (dimensions.TEXT_WIDTH / 2)),
+        Math.round((this.canvasDimensions.HEIGHT - 25) / 3),
+        dimensions.TEXT_WIDTH, dimensions.TEXT_HEIGHT + 4);
+    this.canvasCtx.restore();
+  },
+
+  reset() {
+    if (this.gameOverRafId) {
+      cancelAnimationFrame(this.gameOverRafId);
+      this.gameOverRafId = null;
+    }
+    this.animTimer = 0;
+    this.frameTimeStamp = 0;
+    this.currentFrame = 0;
+    this.flashTimer = 0;
+    this.flashCounter = 0;
+    this.originalText = true;
+  },
+};
+
+
+//******************************************************************************
+
+/**
+ * Check for a collision.
+ * @param {!Obstacle} obstacle
+ * @param {!Trex} tRex T-rex object.
+ * @param {CanvasRenderingContext2D=} opt_canvasCtx Optional canvas context for
+ *    drawing collision boxes.
+ * @return {Array<CollisionBox>|undefined}
+ */
+function checkForCollision(obstacle, tRex, opt_canvasCtx) {
+  Runner.defaultDimensions.WIDTH + obstacle.xPos;
+
+  // Adjustments are made to the bounding box as there is a 1 pixel white
+  // border around the t-rex and obstacles.
+  const tRexBox = new CollisionBox(
+      tRex.xPos + 1,
+      tRex.yPos + 1,
+      tRex.config.WIDTH - 2,
+      tRex.config.HEIGHT - 2);
+
+  const obstacleBox = new CollisionBox(
+      obstacle.xPos + 1,
+      obstacle.yPos + 1,
+      obstacle.typeConfig.width * obstacle.size - 2,
+      obstacle.typeConfig.height - 2);
+
+  // Debug outer box
+  if (opt_canvasCtx) {
+    drawCollisionBoxes(opt_canvasCtx, tRexBox, obstacleBox);
+  }
+
+  // Simple outer bounds check.
+  if (boxCompare(tRexBox, obstacleBox)) {
+    const collisionBoxes = obstacle.collisionBoxes;
+    let tRexCollisionBoxes = [];
+
+    if (Runner.isAltGameModeEnabled()) {
+      tRexCollisionBoxes = Runner.spriteDefinition.TREX.COLLISION_BOXES;
+    } else {
+      tRexCollisionBoxes = tRex.ducking ? Trex.collisionBoxes.DUCKING :
+                                          Trex.collisionBoxes.RUNNING;
+    }
+
+    // Detailed axis aligned box check.
+    for (let t = 0; t < tRexCollisionBoxes.length; t++) {
+      for (let i = 0; i < collisionBoxes.length; i++) {
+        // Adjust the box to actual positions.
+        const adjTrexBox =
+            createAdjustedCollisionBox(tRexCollisionBoxes[t], tRexBox);
+        const adjObstacleBox =
+            createAdjustedCollisionBox(collisionBoxes[i], obstacleBox);
+        const crashed = boxCompare(adjTrexBox, adjObstacleBox);
+
+        // Draw boxes for debug.
+        if (opt_canvasCtx) {
+          drawCollisionBoxes(opt_canvasCtx, adjTrexBox, adjObstacleBox);
+        }
+
+        if (crashed) {
+          return [adjTrexBox, adjObstacleBox];
+        }
+      }
+    }
+  }
+}
+
+
+/**
+ * Adjust the collision box.
+ * @param {!CollisionBox} box The original box.
+ * @param {!CollisionBox} adjustment Adjustment box.
+ * @return {CollisionBox} The adjusted collision box object.
+ */
+function createAdjustedCollisionBox(box, adjustment) {
+  return new CollisionBox(
+      box.x + adjustment.x,
+      box.y + adjustment.y,
+      box.width,
+      box.height);
+}
+
+
+/**
+ * Draw the collision boxes for debug.
+ */
+function drawCollisionBoxes(canvasCtx, tRexBox, obstacleBox) {
+  canvasCtx.save();
+  canvasCtx.strokeStyle = '#f00';
+  canvasCtx.strokeRect(tRexBox.x, tRexBox.y, tRexBox.width, tRexBox.height);
+
+  canvasCtx.strokeStyle = '#0f0';
+  canvasCtx.strokeRect(obstacleBox.x, obstacleBox.y,
+      obstacleBox.width, obstacleBox.height);
+  canvasCtx.restore();
+}
+
+
+/**
+ * Compare two collision boxes for a collision.
+ * @param {CollisionBox} tRexBox
+ * @param {CollisionBox} obstacleBox
+ * @return {boolean} Whether the boxes intersected.
+ */
+function boxCompare(tRexBox, obstacleBox) {
+  let crashed = false;
+  tRexBox.x;
+  tRexBox.y;
+
+  const obstacleBoxX = obstacleBox.x;
+  obstacleBox.y;
+
+  // Axis-Aligned Bounding Box method.
+  if (tRexBox.x < obstacleBoxX + obstacleBox.width &&
+      tRexBox.x + tRexBox.width > obstacleBoxX &&
+      tRexBox.y < obstacleBox.y + obstacleBox.height &&
+      tRexBox.height + tRexBox.y > obstacleBox.y) {
+    crashed = true;
+  }
+
+  return crashed;
+}
+
+
+//******************************************************************************
+
+/**
+ * Obstacle.
+ * @param {CanvasRenderingContext2D} canvasCtx
+ * @param {ObstacleType} type
+ * @param {Object} spriteImgPos Obstacle position in sprite.
+ * @param {Object} dimensions
+ * @param {number} gapCoefficient Mutipler in determining the gap.
+ * @param {number} speed
+ * @param {number=} opt_xOffset
+ * @param {boolean=} opt_isAltGameMode
+ * @constructor
+ */
+function Obstacle(
+    canvasCtx, type, spriteImgPos, dimensions, gapCoefficient, speed,
+    opt_xOffset, opt_isAltGameMode) {
+  this.canvasCtx = canvasCtx;
+  this.spritePos = spriteImgPos;
+  this.typeConfig = type;
+  this.gapCoefficient = Runner.slowDown ? gapCoefficient * 2 : gapCoefficient;
+  this.size = getRandomNum(1, Obstacle.MAX_OBSTACLE_LENGTH);
+  this.dimensions = dimensions;
+  this.remove = false;
+  this.xPos = dimensions.WIDTH + (opt_xOffset || 0);
+  this.yPos = 0;
+  this.width = 0;
+  this.collisionBoxes = [];
+  this.gap = 0;
+  this.speedOffset = 0;
+  this.altGameModeActive = opt_isAltGameMode;
+  this.imageSprite = this.typeConfig.type == 'COLLECTABLE' ?
+      Runner.altCommonImageSprite :
+      this.altGameModeActive ? Runner.altGameImageSprite : Runner.imageSprite;
+
+  // For animated obstacles.
+  this.currentFrame = 0;
+  this.timer = 0;
+
+  this.init(speed);
+}
+
+/**
+ * Coefficient for calculating the maximum gap.
+ */
+Obstacle.MAX_GAP_COEFFICIENT = 1.5;
+
+/**
+ * Maximum obstacle grouping count.
+ */
+Obstacle.MAX_OBSTACLE_LENGTH = 3;
+
+
+Obstacle.prototype = {
+  /**
+   * Initialise the DOM for the obstacle.
+   * @param {number} speed
+   */
+  init(speed) {
+    this.cloneCollisionBoxes();
+
+    // Only allow sizing if we're at the right speed.
+    if (this.size > 1 && this.typeConfig.multipleSpeed > speed) {
+      this.size = 1;
+    }
+
+    this.width = this.typeConfig.width * this.size;
+
+    // Check if obstacle can be positioned at various heights.
+    if (Array.isArray(this.typeConfig.yPos)) {
+      const yPosConfig =
+          IS_MOBILE ? this.typeConfig.yPosMobile : this.typeConfig.yPos;
+      this.yPos = yPosConfig[getRandomNum(0, yPosConfig.length - 1)];
+    } else {
+      this.yPos = this.typeConfig.yPos;
+    }
+
+    this.draw();
+
+    // Make collision box adjustments,
+    // Central box is adjusted to the size as one box.
+    //      ____        ______        ________
+    //    _|   |-|    _|     |-|    _|       |-|
+    //   | |<->| |   | |<--->| |   | |<----->| |
+    //   | | 1 | |   | |  2  | |   | |   3   | |
+    //   |_|___|_|   |_|_____|_|   |_|_______|_|
+    //
+    if (this.size > 1) {
+      this.collisionBoxes[1].width = this.width - this.collisionBoxes[0].width -
+          this.collisionBoxes[2].width;
+      this.collisionBoxes[2].x = this.width - this.collisionBoxes[2].width;
+    }
+
+    // For obstacles that go at a different speed from the horizon.
+    if (this.typeConfig.speedOffset) {
+      this.speedOffset = Math.random() > 0.5 ? this.typeConfig.speedOffset :
+                                               -this.typeConfig.speedOffset;
+    }
+
+    this.gap = this.getGap(this.gapCoefficient, speed);
+
+    // Increase gap for audio cues enabled.
+    if (Runner.audioCues) {
+      this.gap *= 2;
+    }
+  },
+
+  /**
+   * Draw and crop based on size.
+   */
+  draw() {
+    let sourceWidth = this.typeConfig.width;
+    let sourceHeight = this.typeConfig.height;
+
+    if (IS_HIDPI) {
+      sourceWidth = sourceWidth * 2;
+      sourceHeight = sourceHeight * 2;
+    }
+
+    // X position in sprite.
+    let sourceX =
+        (sourceWidth * this.size) * (0.5 * (this.size - 1)) + this.spritePos.x;
+
+    // Animation frames.
+    if (this.currentFrame > 0) {
+      sourceX += sourceWidth * this.currentFrame;
+    }
+
+    this.canvasCtx.drawImage(
+        this.imageSprite, sourceX, this.spritePos.y, sourceWidth * this.size,
+        sourceHeight, this.xPos, this.yPos, this.typeConfig.width * this.size,
+        this.typeConfig.height);
+  },
+
+  /**
+   * Obstacle frame update.
+   * @param {number} deltaTime
+   * @param {number} speed
+   */
+  update(deltaTime, speed) {
+    if (!this.remove) {
+      if (this.typeConfig.speedOffset) {
+        speed += this.speedOffset;
+      }
+      this.xPos -= Math.floor((speed * FPS / 1000) * deltaTime);
+
+      // Update frame
+      if (this.typeConfig.numFrames) {
+        this.timer += deltaTime;
+        if (this.timer >= this.typeConfig.frameRate) {
+          this.currentFrame =
+              this.currentFrame === this.typeConfig.numFrames - 1 ?
+              0 :
+              this.currentFrame + 1;
+          this.timer = 0;
+        }
+      }
+      this.draw();
+
+      if (!this.isVisible()) {
+        this.remove = true;
+      }
+    }
+  },
+
+  /**
+   * Calculate a random gap size.
+   * - Minimum gap gets wider as speed increses
+   * @param {number} gapCoefficient
+   * @param {number} speed
+   * @return {number} The gap size.
+   */
+  getGap(gapCoefficient, speed) {
+    const minGap = Math.round(
+        this.width * speed + this.typeConfig.minGap * gapCoefficient);
+    const maxGap = Math.round(minGap * Obstacle.MAX_GAP_COEFFICIENT);
+    return getRandomNum(minGap, maxGap);
+  },
+
+  /**
+   * Check if obstacle is visible.
+   * @return {boolean} Whether the obstacle is in the game area.
+   */
+  isVisible() {
+    return this.xPos + this.width > 0;
+  },
+
+  /**
+   * Make a copy of the collision boxes, since these will change based on
+   * obstacle type and size.
+   */
+  cloneCollisionBoxes() {
+    const collisionBoxes = this.typeConfig.collisionBoxes;
+
+    for (let i = collisionBoxes.length - 1; i >= 0; i--) {
+      this.collisionBoxes[i] = new CollisionBox(
+          collisionBoxes[i].x, collisionBoxes[i].y, collisionBoxes[i].width,
+          collisionBoxes[i].height);
+    }
+  },
+};
+
+
+//******************************************************************************
+/**
+ * T-rex game character.
+ * @param {HTMLCanvasElement} canvas
+ * @param {Object} spritePos Positioning within image sprite.
+ * @constructor
+ */
+function Trex(canvas, spritePos) {
+  this.canvas = canvas;
+  this.canvasCtx =
+      /** @type {CanvasRenderingContext2D} */ (canvas.getContext('2d'));
+  this.spritePos = spritePos;
+  this.xPos = 0;
+  this.yPos = 0;
+  this.xInitialPos = 0;
+  // Position when on the ground.
+  this.groundYPos = 0;
+  this.currentFrame = 0;
+  this.currentAnimFrames = [];
+  this.blinkDelay = 0;
+  this.blinkCount = 0;
+  this.animStartTime = 0;
+  this.timer = 0;
+  this.msPerFrame = 1000 / FPS;
+  this.config = Object.assign(Trex.config, Trex.normalJumpConfig);
+  // Current status.
+  this.status = Trex.status.WAITING;
+  this.jumping = false;
+  this.ducking = false;
+  this.jumpVelocity = 0;
+  this.reachedMinHeight = false;
+  this.speedDrop = false;
+  this.jumpCount = 0;
+  this.jumpspotX = 0;
+  this.altGameModeEnabled = false;
+  this.flashing = false;
+
+  this.init();
+}
+
+
+/**
+ * T-rex player config.
+ */
+Trex.config = {
+  DROP_VELOCITY: -5,
+  FLASH_OFF: 175,
+  FLASH_ON: 100,
+  HEIGHT: 47,
+  HEIGHT_DUCK: 25,
+  INTRO_DURATION: 1500,
+  SPEED_DROP_COEFFICIENT: 3,
+  SPRITE_WIDTH: 262,
+  START_X_POS: 50,
+  WIDTH: 44,
+  WIDTH_DUCK: 59,
+};
+
+Trex.slowJumpConfig = {
+  GRAVITY: 0.25,
+  MAX_JUMP_HEIGHT: 50,
+  MIN_JUMP_HEIGHT: 45,
+  INITIAL_JUMP_VELOCITY: -20,
+};
+
+Trex.normalJumpConfig = {
+  GRAVITY: 0.6,
+  MAX_JUMP_HEIGHT: 30,
+  MIN_JUMP_HEIGHT: 30,
+  INITIAL_JUMP_VELOCITY: -10,
+};
+
+/**
+ * Used in collision detection.
+ * @enum {Array<CollisionBox>}
+ */
+Trex.collisionBoxes = {
+  DUCKING: [new CollisionBox(1, 18, 55, 25)],
+  RUNNING: [
+    new CollisionBox(22, 0, 17, 16),
+    new CollisionBox(1, 18, 30, 9),
+    new CollisionBox(10, 35, 14, 8),
+    new CollisionBox(1, 24, 29, 5),
+    new CollisionBox(5, 30, 21, 4),
+    new CollisionBox(9, 34, 15, 4),
+  ],
+};
+
+
+/**
+ * Animation states.
+ * @enum {string}
+ */
+Trex.status = {
+  CRASHED: 'CRASHED',
+  DUCKING: 'DUCKING',
+  JUMPING: 'JUMPING',
+  RUNNING: 'RUNNING',
+  WAITING: 'WAITING',
+};
+
+/**
+ * Blinking coefficient.
+ * @const
+ */
+Trex.BLINK_TIMING = 7000;
+
+
+/**
+ * Animation config for different states.
+ * @enum {Object}
+ */
+Trex.animFrames = {
+  WAITING: {
+    frames: [44, 0],
+    msPerFrame: 1000 / 3,
+  },
+  RUNNING: {
+    frames: [88, 132],
+    msPerFrame: 1000 / 12,
+  },
+  CRASHED: {
+    frames: [220],
+    msPerFrame: 1000 / 60,
+  },
+  JUMPING: {
+    frames: [0],
+    msPerFrame: 1000 / 60,
+  },
+  DUCKING: {
+    frames: [264, 323],
+    msPerFrame: 1000 / 8,
+  },
+};
+
+
+Trex.prototype = {
+  /**
+   * T-rex player initaliser.
+   * Sets the t-rex to blink at random intervals.
+   */
+  init() {
+    this.groundYPos = Runner.defaultDimensions.HEIGHT - this.config.HEIGHT -
+        Runner.config.BOTTOM_PAD;
+    this.yPos = this.groundYPos;
+    this.minJumpHeight = this.groundYPos - this.config.MIN_JUMP_HEIGHT;
+
+    this.draw(0, 0);
+    this.update(0, Trex.status.WAITING);
+  },
+
+  /**
+   * Assign the appropriate jump parameters based on the game speed.
+   */
+  enableSlowConfig: function() {
+    const jumpConfig =
+        Runner.slowDown ? Trex.slowJumpConfig : Trex.normalJumpConfig;
+    Trex.config = Object.assign(Trex.config, jumpConfig);
+
+    this.adjustAltGameConfigForSlowSpeed();
+  },
+
+  /**
+   * Enables the alternative game. Redefines the dino config.
+   * @param {Object} spritePos New positioning within image sprite.
+   */
+  enableAltGameMode: function(spritePos) {
+    this.altGameModeEnabled = true;
+    this.spritePos = spritePos;
+    const spriteDefinition = Runner.spriteDefinition['TREX'];
+
+    // Update animation frames.
+    Trex.animFrames.RUNNING.frames =
+        [spriteDefinition.RUNNING_1.x, spriteDefinition.RUNNING_2.x];
+    Trex.animFrames.CRASHED.frames = [spriteDefinition.CRASHED.x];
+
+    if (typeof spriteDefinition.JUMPING.x == 'object') {
+      Trex.animFrames.JUMPING.frames = spriteDefinition.JUMPING.x;
+    } else {
+      Trex.animFrames.JUMPING.frames = [spriteDefinition.JUMPING.x];
+    }
+
+    Trex.animFrames.DUCKING.frames =
+        [spriteDefinition.DUCKING_1.x, spriteDefinition.DUCKING_2.x];
+
+    // Update Trex config
+    Trex.config.GRAVITY = spriteDefinition.GRAVITY || Trex.config.GRAVITY;
+    Trex.config.HEIGHT = spriteDefinition.RUNNING_1.h,
+    Trex.config.INITIAL_JUMP_VELOCITY = spriteDefinition.INITIAL_JUMP_VELOCITY;
+    Trex.config.MAX_JUMP_HEIGHT = spriteDefinition.MAX_JUMP_HEIGHT;
+    Trex.config.MIN_JUMP_HEIGHT = spriteDefinition.MIN_JUMP_HEIGHT;
+    Trex.config.WIDTH = spriteDefinition.RUNNING_1.w;
+    Trex.config.WIDTH_CRASHED = spriteDefinition.CRASHED.w;
+    Trex.config.WIDTH_JUMP = spriteDefinition.JUMPING.w;
+    Trex.config.INVERT_JUMP = spriteDefinition.INVERT_JUMP;
+
+    this.adjustAltGameConfigForSlowSpeed(spriteDefinition.GRAVITY);
+    this.config = Trex.config;
+
+    // Adjust bottom horizon placement.
+    this.groundYPos = Runner.defaultDimensions.HEIGHT - this.config.HEIGHT -
+        Runner.spriteDefinition['BOTTOM_PAD'];
+    this.yPos = this.groundYPos;
+    this.reset();
+  },
+
+  /**
+   * Slow speeds adjustments for the alt game modes.
+   * @param {number=} opt_gravityValue
+   */
+  adjustAltGameConfigForSlowSpeed: function(opt_gravityValue) {
+    if (Runner.slowDown) {
+      if (opt_gravityValue) {
+        Trex.config.GRAVITY = opt_gravityValue / 1.5;
+      }
+      Trex.config.MIN_JUMP_HEIGHT *= 1.5;
+      Trex.config.MAX_JUMP_HEIGHT *= 1.5;
+      Trex.config.INITIAL_JUMP_VELOCITY =
+          Trex.config.INITIAL_JUMP_VELOCITY * 1.5;
+    }
+  },
+
+  /**
+   * Setter whether dino is flashing.
+   * @param {boolean} status
+   */
+  setFlashing: function(status) {
+    this.flashing = status;
+  },
+
+  /**
+   * Setter for the jump velocity.
+   * The approriate drop velocity is also set.
+   * @param {number} setting
+   */
+  setJumpVelocity(setting) {
+    this.config.INITIAL_JUMP_VELOCITY = -setting;
+    this.config.DROP_VELOCITY = -setting / 2;
+  },
+
+  /**
+   * Set the animation status.
+   * @param {!number} deltaTime
+   * @param {Trex.status=} opt_status Optional status to switch to.
+   */
+  update(deltaTime, opt_status) {
+    this.timer += deltaTime;
+
+    // Update the status.
+    if (opt_status) {
+      this.status = opt_status;
+      this.currentFrame = 0;
+      this.msPerFrame = Trex.animFrames[opt_status].msPerFrame;
+      this.currentAnimFrames = Trex.animFrames[opt_status].frames;
+
+      if (opt_status === Trex.status.WAITING) {
+        this.animStartTime = getTimeStamp();
+        this.setBlinkDelay();
+      }
+    }
+    // Game intro animation, T-rex moves in from the left.
+    if (this.playingIntro && this.xPos < this.config.START_X_POS) {
+      this.xPos += Math.round((this.config.START_X_POS /
+          this.config.INTRO_DURATION) * deltaTime);
+      this.xInitialPos = this.xPos;
+    }
+
+    if (this.status === Trex.status.WAITING) {
+      this.blink(getTimeStamp());
+    } else {
+      this.draw(this.currentAnimFrames[this.currentFrame], 0);
+    }
+
+    // Update the frame position.
+    if (!this.flashing && this.timer >= this.msPerFrame) {
+      this.currentFrame = this.currentFrame ==
+          this.currentAnimFrames.length - 1 ? 0 : this.currentFrame + 1;
+      this.timer = 0;
+    }
+
+    // Speed drop becomes duck if the down key is still being pressed.
+    if (this.speedDrop && this.yPos === this.groundYPos) {
+      this.speedDrop = false;
+      this.setDuck(true);
+    }
+  },
+
+  /**
+   * Draw the t-rex to a particular position.
+   * @param {number} x
+   * @param {number} y
+   */
+  draw(x, y) {
+    let sourceX = x;
+    let sourceY = y;
+    let sourceWidth = this.ducking && this.status !== Trex.status.CRASHED ?
+        this.config.WIDTH_DUCK :
+        this.config.WIDTH;
+    let sourceHeight = this.config.HEIGHT;
+    const outputHeight = sourceHeight;
+    const outputWidth =
+        this.altGameModeEnabled && this.status == Trex.status.CRASHED ?
+        this.config.WIDTH_CRASHED :
+        this.config.WIDTH;
+
+    let jumpOffset = Runner.spriteDefinition.TREX.JUMPING.xOffset;
+
+    // Width of sprite can change on jump or crashed.
+    if (this.altGameModeEnabled) {
+      if (this.jumping && this.status !== Trex.status.CRASHED) {
+        sourceWidth = this.config.WIDTH_JUMP;
+      } else if (this.status == Trex.status.CRASHED) {
+        sourceWidth = this.config.WIDTH_CRASHED;
+      }
+    }
+
+    if (IS_HIDPI) {
+      sourceX *= 2;
+      sourceY *= 2;
+      sourceWidth *= 2;
+      sourceHeight *= 2;
+      jumpOffset *= 2;
+    }
+
+    // Adjustments for sprite sheet position.
+    sourceX += this.spritePos.x;
+    sourceY += this.spritePos.y;
+
+    // Flashing.
+    if (this.flashing) {
+      if (this.timer < this.config.FLASH_ON) {
+        this.canvasCtx.globalAlpha = 0.5;
+      } else if (this.timer > this.config.FLASH_OFF) {
+        this.timer = 0;
+      }
+    }
+
+    // Ducking.
+    if (this.ducking && this.status !== Trex.status.CRASHED) {
+      this.canvasCtx.drawImage(Runner.imageSprite, sourceX, sourceY,
+          sourceWidth, sourceHeight,
+          this.xPos, this.yPos,
+          this.config.WIDTH_DUCK, outputHeight);
+    } else if (
+        this.altGameModeEnabled && this.jumping &&
+        this.status !== Trex.status.CRASHED) {
+      // Jumping with adjustments.
+      this.canvasCtx.drawImage(
+          Runner.imageSprite, sourceX, sourceY, sourceWidth, sourceHeight,
+          this.xPos - jumpOffset, this.yPos, this.config.WIDTH_JUMP,
+          outputHeight);
+    } else {
+      // Crashed whilst ducking. Trex is standing up so needs adjustment.
+      if (this.ducking && this.status === Trex.status.CRASHED) {
+        this.xPos++;
+      }
+      // Standing / running
+      this.canvasCtx.drawImage(
+          Runner.imageSprite, sourceX, sourceY, sourceWidth, sourceHeight,
+          this.xPos, this.yPos, outputWidth, outputHeight);
+    }
+    this.canvasCtx.globalAlpha = 1;
+  },
+
+  /**
+   * Sets a random time for the blink to happen.
+   */
+  setBlinkDelay() {
+    this.blinkDelay = Math.ceil(Math.random() * Trex.BLINK_TIMING);
+  },
+
+  /**
+   * Make t-rex blink at random intervals.
+   * @param {number} time Current time in milliseconds.
+   */
+  blink(time) {
+    const deltaTime = time - this.animStartTime;
+
+    if (deltaTime >= this.blinkDelay) {
+      this.draw(this.currentAnimFrames[this.currentFrame], 0);
+
+      if (this.currentFrame === 1) {
+        // Set new random delay to blink.
+        this.setBlinkDelay();
+        this.animStartTime = time;
+        this.blinkCount++;
+      }
+    }
+  },
+
+  /**
+   * Initialise a jump.
+   * @param {number} speed
+   */
+  startJump(speed) {
+    if (!this.jumping) {
+      this.update(0, Trex.status.JUMPING);
+      // Tweak the jump velocity based on the speed.
+      this.jumpVelocity = this.config.INITIAL_JUMP_VELOCITY - (speed / 10);
+      this.jumping = true;
+      this.reachedMinHeight = false;
+      this.speedDrop = false;
+
+      if (this.config.INVERT_JUMP) {
+        this.minJumpHeight = this.groundYPos + this.config.MIN_JUMP_HEIGHT;
+      }
+    }
+  },
+
+  /**
+   * Jump is complete, falling down.
+   */
+  endJump() {
+    if (this.reachedMinHeight &&
+        this.jumpVelocity < this.config.DROP_VELOCITY) {
+      this.jumpVelocity = this.config.DROP_VELOCITY;
+    }
+  },
+
+  /**
+   * Update frame for a jump.
+   * @param {number} deltaTime
+   */
+  updateJump(deltaTime) {
+    const msPerFrame = Trex.animFrames[this.status].msPerFrame;
+    const framesElapsed = deltaTime / msPerFrame;
+
+    // Speed drop makes Trex fall faster.
+    if (this.speedDrop) {
+      this.yPos += Math.round(this.jumpVelocity *
+          this.config.SPEED_DROP_COEFFICIENT * framesElapsed);
+    } else if (this.config.INVERT_JUMP) {
+      this.yPos -= Math.round(this.jumpVelocity * framesElapsed);
+    } else {
+      this.yPos += Math.round(this.jumpVelocity * framesElapsed);
+    }
+
+    this.jumpVelocity += this.config.GRAVITY * framesElapsed;
+
+    // Minimum height has been reached.
+    if (this.config.INVERT_JUMP && (this.yPos > this.minJumpHeight) ||
+        !this.config.INVERT_JUMP && (this.yPos < this.minJumpHeight) ||
+        this.speedDrop) {
+      this.reachedMinHeight = true;
+    }
+
+    // Reached max height.
+    if (this.config.INVERT_JUMP && (this.yPos > -this.config.MAX_JUMP_HEIGHT) ||
+        !this.config.INVERT_JUMP && (this.yPos < this.config.MAX_JUMP_HEIGHT) ||
+        this.speedDrop) {
+      this.endJump();
+    }
+
+    // Back down at ground level. Jump completed.
+    if ((this.config.INVERT_JUMP && this.yPos) < this.groundYPos ||
+        (!this.config.INVERT_JUMP && this.yPos) > this.groundYPos) {
+      this.reset();
+      this.jumpCount++;
+
+      if (Runner.audioCues) {
+        Runner.generatedSoundFx.loopFootSteps();
+      }
+    }
+  },
+
+  /**
+   * Set the speed drop. Immediately cancels the current jump.
+   */
+  setSpeedDrop() {
+    this.speedDrop = true;
+    this.jumpVelocity = 1;
+  },
+
+  /**
+   * @param {boolean} isDucking
+   */
+  setDuck(isDucking) {
+    if (isDucking && this.status !== Trex.status.DUCKING) {
+      this.update(0, Trex.status.DUCKING);
+      this.ducking = true;
+    } else if (this.status === Trex.status.DUCKING) {
+      this.update(0, Trex.status.RUNNING);
+      this.ducking = false;
+    }
+  },
+
+  /**
+   * Reset the t-rex to running at start of game.
+   */
+  reset() {
+    this.xPos = this.xInitialPos;
+    this.yPos = this.groundYPos;
+    this.jumpVelocity = 0;
+    this.jumping = false;
+    this.ducking = false;
+    this.update(0, Trex.status.RUNNING);
+    this.midair = false;
+    this.speedDrop = false;
+    this.jumpCount = 0;
+  },
+};
+
+
+//******************************************************************************
+
+/**
+ * Handles displaying the distance meter.
+ * @param {!HTMLCanvasElement} canvas
+ * @param {Object} spritePos Image position in sprite.
+ * @param {number} canvasWidth
+ * @constructor
+ */
+function DistanceMeter(canvas, spritePos, canvasWidth) {
+  this.canvas = canvas;
+  this.canvasCtx =
+      /** @type {CanvasRenderingContext2D} */ (canvas.getContext('2d'));
+  this.image = Runner.imageSprite;
+  this.spritePos = spritePos;
+  this.x = 0;
+  this.y = 5;
+
+  this.currentDistance = 0;
+  this.maxScore = 0;
+  this.highScore = '0';
+  this.container = null;
+
+  this.digits = [];
+  this.achievement = false;
+  this.defaultString = '';
+  this.flashTimer = 0;
+  this.flashIterations = 0;
+  this.invertTrigger = false;
+  this.flashingRafId = null;
+  this.highScoreBounds = {};
+  this.highScoreFlashing = false;
+
+  this.config = DistanceMeter.config;
+  this.maxScoreUnits = this.config.MAX_DISTANCE_UNITS;
+  this.canvasWidth = canvasWidth;
+  this.init(canvasWidth);
+}
+
+
+/**
+ * @enum {number}
+ */
+DistanceMeter.dimensions = {
+  WIDTH: 10,
+  HEIGHT: 13,
+  DEST_WIDTH: 11,
+};
+
+
+/**
+ * Y positioning of the digits in the sprite sheet.
+ * X position is always 0.
+ * @type {Array<number>}
+ */
+DistanceMeter.yPos = [0, 13, 27, 40, 53, 67, 80, 93, 107, 120];
+
+
+/**
+ * Distance meter config.
+ * @enum {number}
+ */
+DistanceMeter.config = {
+  // Number of digits.
+  MAX_DISTANCE_UNITS: 5,
+
+  // Distance that causes achievement animation.
+  ACHIEVEMENT_DISTANCE: 100,
+
+  // Used for conversion from pixel distance to a scaled unit.
+  COEFFICIENT: 0.025,
+
+  // Flash duration in milliseconds.
+  FLASH_DURATION: 1000 / 4,
+
+  // Flash iterations for achievement animation.
+  FLASH_ITERATIONS: 3,
+
+  // Padding around the high score hit area.
+  HIGH_SCORE_HIT_AREA_PADDING: 4,
+};
+
+
+DistanceMeter.prototype = {
+  /**
+   * Initialise the distance meter to '00000'.
+   * @param {number} width Canvas width in px.
+   */
+  init(width) {
+    let maxDistanceStr = '';
+
+    this.calcXPos(width);
+    this.maxScore = this.maxScoreUnits;
+    for (let i = 0; i < this.maxScoreUnits; i++) {
+      this.draw(i, 0);
+      this.defaultString += '0';
+      maxDistanceStr += '9';
+    }
+
+    this.maxScore = parseInt(maxDistanceStr, 10);
+  },
+
+  /**
+   * Calculate the xPos in the canvas.
+   * @param {number} canvasWidth
+   */
+  calcXPos(canvasWidth) {
+    this.x = canvasWidth - (DistanceMeter.dimensions.DEST_WIDTH *
+        (this.maxScoreUnits + 1));
+  },
+
+  /**
+   * Draw a digit to canvas.
+   * @param {number} digitPos Position of the digit.
+   * @param {number} value Digit value 0-9.
+   * @param {boolean=} opt_highScore Whether drawing the high score.
+   */
+  draw(digitPos, value, opt_highScore) {
+    let sourceWidth = DistanceMeter.dimensions.WIDTH;
+    let sourceHeight = DistanceMeter.dimensions.HEIGHT;
+    let sourceX = DistanceMeter.dimensions.WIDTH * value;
+    let sourceY = 0;
+
+    const targetX = digitPos * DistanceMeter.dimensions.DEST_WIDTH;
+    const targetY = this.y;
+    const targetWidth = DistanceMeter.dimensions.WIDTH;
+    const targetHeight = DistanceMeter.dimensions.HEIGHT;
+
+    // For high DPI we 2x source values.
+    if (IS_HIDPI) {
+      sourceWidth *= 2;
+      sourceHeight *= 2;
+      sourceX *= 2;
+    }
+
+    sourceX += this.spritePos.x;
+    sourceY += this.spritePos.y;
+
+    this.canvasCtx.save();
+
+    if (IS_RTL) {
+      if (opt_highScore) {
+        this.canvasCtx.translate(
+            this.canvasWidth -
+                (DistanceMeter.dimensions.WIDTH * (this.maxScoreUnits + 3)),
+            this.y);
+      } else {
+        this.canvasCtx.translate(
+            this.canvasWidth - DistanceMeter.dimensions.WIDTH, this.y);
+      }
+      this.canvasCtx.scale(-1, 1);
+    } else {
+      const highScoreX =
+          this.x - (this.maxScoreUnits * 2) * DistanceMeter.dimensions.WIDTH;
+      if (opt_highScore) {
+        this.canvasCtx.translate(highScoreX, this.y);
+      } else {
+        this.canvasCtx.translate(this.x, this.y);
+      }
+    }
+
+    this.canvasCtx.drawImage(
+        this.image,
+        sourceX,
+        sourceY,
+        sourceWidth,
+        sourceHeight,
+        targetX,
+        targetY,
+        targetWidth,
+        targetHeight,
+    );
+
+    this.canvasCtx.restore();
+  },
+
+  /**
+   * Covert pixel distance to a 'real' distance.
+   * @param {number} distance Pixel distance ran.
+   * @return {number} The 'real' distance ran.
+   */
+  getActualDistance(distance) {
+    return distance ? Math.round(distance * this.config.COEFFICIENT) : 0;
+  },
+
+  /**
+   * Update the distance meter.
+   * @param {number} distance
+   * @param {number} deltaTime
+   * @return {boolean} Whether the acheivement sound fx should be played.
+   */
+  update(deltaTime, distance) {
+    let paint = true;
+    let playSound = false;
+
+    if (!this.achievement) {
+      distance = this.getActualDistance(distance);
+      // Score has gone beyond the initial digit count.
+      if (distance > this.maxScore && this.maxScoreUnits ==
+        this.config.MAX_DISTANCE_UNITS) {
+        this.maxScoreUnits++;
+        this.maxScore = parseInt(this.maxScore + '9', 10);
+      } else {
+        this.distance = 0;
+      }
+
+      if (distance > 0) {
+        // Achievement unlocked.
+        if (distance % this.config.ACHIEVEMENT_DISTANCE === 0) {
+          // Flash score and play sound.
+          this.achievement = true;
+          this.flashTimer = 0;
+          playSound = true;
+        }
+
+        // Create a string representation of the distance with leading 0.
+        const distanceStr = (this.defaultString +
+            distance).substr(-this.maxScoreUnits);
+        this.digits = distanceStr.split('');
+      } else {
+        this.digits = this.defaultString.split('');
+      }
+    } else {
+      // Control flashing of the score on reaching acheivement.
+      if (this.flashIterations <= this.config.FLASH_ITERATIONS) {
+        this.flashTimer += deltaTime;
+
+        if (this.flashTimer < this.config.FLASH_DURATION) {
+          paint = false;
+        } else if (this.flashTimer > this.config.FLASH_DURATION * 2) {
+          this.flashTimer = 0;
+          this.flashIterations++;
+        }
+      } else {
+        this.achievement = false;
+        this.flashIterations = 0;
+        this.flashTimer = 0;
+      }
+    }
+
+    // Draw the digits if not flashing.
+    if (paint) {
+      for (let i = this.digits.length - 1; i >= 0; i--) {
+        this.draw(i, parseInt(this.digits[i], 10));
+      }
+    }
+
+    this.drawHighScore();
+    return playSound;
+  },
+
+  /**
+   * Draw the high score.
+   */
+  drawHighScore() {
+    if (parseInt(this.highScore, 10) > 0) {
+      this.canvasCtx.save();
+      this.canvasCtx.globalAlpha = .8;
+      for (let i = this.highScore.length - 1; i >= 0; i--) {
+        this.draw(i, parseInt(this.highScore[i], 10), true);
+      }
+      this.canvasCtx.restore();
+    }
+  },
+
+  /**
+   * Set the highscore as a array string.
+   * Position of char in the sprite: H - 10, I - 11.
+   * @param {number} distance Distance ran in pixels.
+   */
+  setHighScore(distance) {
+    distance = this.getActualDistance(distance);
+    const highScoreStr = (this.defaultString +
+        distance).substr(-this.maxScoreUnits);
+
+    this.highScore = ['10', '11', ''].concat(highScoreStr.split(''));
+  },
+
+
+  /**
+   * Whether a clicked is in the high score area.
+   * @param {Event} e Event object.
+   * @return {boolean} Whether the click was in the high score bounds.
+   */
+  hasClickedOnHighScore(e) {
+    let x = 0;
+    let y = 0;
+
+    if (e.touches) {
+      // Bounds for touch differ from pointer.
+      const canvasBounds = this.canvas.getBoundingClientRect();
+      x = e.touches[0].clientX - canvasBounds.left;
+      y = e.touches[0].clientY - canvasBounds.top;
+    } else {
+      x = e.offsetX;
+      y = e.offsetY;
+    }
+
+    this.highScoreBounds = this.getHighScoreBounds();
+    return x >= this.highScoreBounds.x && x <=
+        this.highScoreBounds.x + this.highScoreBounds.width &&
+        y >= this.highScoreBounds.y && y <=
+        this.highScoreBounds.y + this.highScoreBounds.height;
+  },
+
+  /**
+   * Get the bounding box for the high score.
+   * @return {Object} Object with x, y, width and height properties.
+   */
+  getHighScoreBounds() {
+    return {
+      x: (this.x - (this.maxScoreUnits * 2) * DistanceMeter.dimensions.WIDTH) -
+          DistanceMeter.config.HIGH_SCORE_HIT_AREA_PADDING,
+      y: this.y,
+      width: DistanceMeter.dimensions.WIDTH * (this.highScore.length + 1) +
+          DistanceMeter.config.HIGH_SCORE_HIT_AREA_PADDING,
+      height: DistanceMeter.dimensions.HEIGHT +
+          (DistanceMeter.config.HIGH_SCORE_HIT_AREA_PADDING * 2),
+    };
+  },
+
+  /**
+   * Animate flashing the high score to indicate ready for resetting.
+   * The flashing stops following this.config.FLASH_ITERATIONS x 2 flashes.
+   */
+  flashHighScore() {
+    const now = getTimeStamp();
+    const deltaTime = now - (this.frameTimeStamp || now);
+    let paint = true;
+    this.frameTimeStamp = now;
+
+    // Reached the max number of flashes.
+    if (this.flashIterations > this.config.FLASH_ITERATIONS * 2) {
+      this.cancelHighScoreFlashing();
+      return;
+    }
+
+    this.flashTimer += deltaTime;
+
+    if (this.flashTimer < this.config.FLASH_DURATION) {
+      paint = false;
+    } else if (this.flashTimer > this.config.FLASH_DURATION * 2) {
+      this.flashTimer = 0;
+      this.flashIterations++;
+    }
+
+    if (paint) {
+      this.drawHighScore();
+    } else {
+      this.clearHighScoreBounds();
+    }
+    // Frame update.
+    this.flashingRafId =
+        requestAnimationFrame(this.flashHighScore.bind(this));
+  },
+
+  /**
+   * Draw empty rectangle over high score.
+   */
+  clearHighScoreBounds() {
+    this.canvasCtx.save();
+    this.canvasCtx.fillStyle = '#fff';
+    this.canvasCtx.rect(this.highScoreBounds.x, this.highScoreBounds.y,
+        this.highScoreBounds.width, this.highScoreBounds.height);
+    this.canvasCtx.fill();
+    this.canvasCtx.restore();
+  },
+
+  /**
+   * Starts the flashing of the high score.
+   */
+  startHighScoreFlashing() {
+    this.highScoreFlashing = true;
+    this.flashHighScore();
+  },
+
+  /**
+   * Whether high score is flashing.
+   * @return {boolean}
+   */
+  isHighScoreFlashing() {
+    return this.highScoreFlashing;
+  },
+
+  /**
+   * Stop flashing the high score.
+   */
+  cancelHighScoreFlashing() {
+    if (this.flashingRafId) {
+      cancelAnimationFrame(this.flashingRafId);
+    }
+    this.flashIterations = 0;
+    this.flashTimer = 0;
+    this.highScoreFlashing = false;
+    this.clearHighScoreBounds();
+    this.drawHighScore();
+  },
+
+  /**
+   * Clear the high score.
+   */
+  resetHighScore() {
+    this.setHighScore(0);
+    this.cancelHighScoreFlashing();
+  },
+
+  /**
+   * Reset the distance meter back to '00000'.
+   */
+  reset() {
+    this.update(0, 0);
+    this.achievement = false;
+  },
+};
+
+
+//******************************************************************************
+
+/**
+ * Cloud background item.
+ * Similar to an obstacle object but without collision boxes.
+ * @param {HTMLCanvasElement} canvas Canvas element.
+ * @param {Object} spritePos Position of image in sprite.
+ * @param {number} containerWidth
+ * @constructor
+ */
+function Cloud(canvas, spritePos, containerWidth) {
+  this.canvas = canvas;
+  this.canvasCtx =
+      /** @type {CanvasRenderingContext2D} */ (this.canvas.getContext('2d'));
+  this.spritePos = spritePos;
+  this.containerWidth = containerWidth;
+  this.xPos = containerWidth;
+  this.yPos = 0;
+  this.remove = false;
+  this.gap =
+      getRandomNum(Cloud.config.MIN_CLOUD_GAP, Cloud.config.MAX_CLOUD_GAP);
+
+  this.init();
+}
+
+
+/**
+ * Cloud object config.
+ * @enum {number}
+ */
+Cloud.config = {
+  HEIGHT: 14,
+  MAX_CLOUD_GAP: 400,
+  MAX_SKY_LEVEL: 30,
+  MIN_CLOUD_GAP: 100,
+  MIN_SKY_LEVEL: 71,
+  WIDTH: 46,
+};
+
+
+Cloud.prototype = {
+  /**
+   * Initialise the cloud. Sets the Cloud height.
+   */
+  init() {
+    this.yPos = getRandomNum(Cloud.config.MAX_SKY_LEVEL,
+        Cloud.config.MIN_SKY_LEVEL);
+    this.draw();
+  },
+
+  /**
+   * Draw the cloud.
+   */
+  draw() {
+    this.canvasCtx.save();
+    let sourceWidth = Cloud.config.WIDTH;
+    let sourceHeight = Cloud.config.HEIGHT;
+    const outputWidth = sourceWidth;
+    const outputHeight = sourceHeight;
+    if (IS_HIDPI) {
+      sourceWidth = sourceWidth * 2;
+      sourceHeight = sourceHeight * 2;
+    }
+
+    this.canvasCtx.drawImage(Runner.imageSprite, this.spritePos.x,
+        this.spritePos.y,
+        sourceWidth, sourceHeight,
+        this.xPos, this.yPos,
+        outputWidth, outputHeight);
+
+    this.canvasCtx.restore();
+  },
+
+  /**
+   * Update the cloud position.
+   * @param {number} speed
+   */
+  update(speed) {
+    if (!this.remove) {
+      this.xPos -= Math.ceil(speed);
+      this.draw();
+
+      // Mark as removeable if no longer in the canvas.
+      if (!this.isVisible()) {
+        this.remove = true;
+      }
+    }
+  },
+
+  /**
+   * Check if the cloud is visible on the stage.
+   * @return {boolean}
+   */
+  isVisible() {
+    return this.xPos + Cloud.config.WIDTH > 0;
+  },
+};
+
+
+/**
+ * Background item.
+ * Similar to cloud, without random y position.
+ * @param {HTMLCanvasElement} canvas Canvas element.
+ * @param {Object} spritePos Position of image in sprite.
+ * @param {number} containerWidth
+ * @param {string} type Element type.
+ * @constructor
+ */
+function BackgroundEl(canvas, spritePos, containerWidth, type) {
+  this.canvas = canvas;
+  this.canvasCtx =
+      /** @type {CanvasRenderingContext2D} */ (this.canvas.getContext('2d'));
+  this.spritePos = spritePos;
+  this.containerWidth = containerWidth;
+  this.xPos = containerWidth;
+  this.yPos = 0;
+  this.remove = false;
+  this.type = type;
+  this.gap =
+      getRandomNum(BackgroundEl.config.MIN_GAP, BackgroundEl.config.MAX_GAP);
+  this.animTimer = 0;
+  this.switchFrames = false;
+
+  this.spriteConfig = {};
+  this.init();
+}
+
+/**
+ * Background element object config.
+ * Real values assigned when game type changes.
+ * @enum {number}
+ */
+BackgroundEl.config = {
+  MAX_BG_ELS: 0,
+  MAX_GAP: 0,
+  MIN_GAP: 0,
+  POS: 0,
+  SPEED: 0,
+  Y_POS: 0,
+  MS_PER_FRAME: 0,  // only needed when BACKGROUND_EL.FIXED is true
+};
+
+
+BackgroundEl.prototype = {
+  /**
+   * Initialise the element setting the y position.
+   */
+  init() {
+    this.spriteConfig = Runner.spriteDefinition.BACKGROUND_EL[this.type];
+    if (this.spriteConfig.FIXED) {
+      this.xPos = this.spriteConfig.FIXED_X_POS;
+    }
+    this.yPos = BackgroundEl.config.Y_POS - this.spriteConfig.HEIGHT +
+        this.spriteConfig.OFFSET;
+    this.draw();
+  },
+
+  /**
+   * Draw the element.
+   */
+  draw() {
+    this.canvasCtx.save();
+    let sourceWidth = this.spriteConfig.WIDTH;
+    let sourceHeight = this.spriteConfig.HEIGHT;
+    let sourceX = this.spriteConfig.X_POS;
+    const outputWidth = sourceWidth;
+    const outputHeight = sourceHeight;
+
+    if (IS_HIDPI) {
+      sourceWidth *= 2;
+      sourceHeight *= 2;
+      sourceX *= 2;
+    }
+
+    this.canvasCtx.drawImage(
+        Runner.imageSprite, sourceX, this.spritePos.y, sourceWidth,
+        sourceHeight, this.xPos, this.yPos, outputWidth, outputHeight);
+
+    this.canvasCtx.restore();
+  },
+
+  /**
+   * Update the background element position.
+   * @param {number} speed
+   */
+  update(speed) {
+    if (!this.remove) {
+      if (this.spriteConfig.FIXED) {
+        this.animTimer += speed;
+        if (this.animTimer > BackgroundEl.config.MS_PER_FRAME) {
+          this.animTimer = 0;
+          this.switchFrames = !this.switchFrames;
+        }
+
+        if (this.spriteConfig.FIXED_Y_POS_1 &&
+            this.spriteConfig.FIXED_Y_POS_2) {
+          this.yPos = this.switchFrames ? this.spriteConfig.FIXED_Y_POS_1 :
+                                          this.spriteConfig.FIXED_Y_POS_2;
+        }
+      } else {
+        // Fixed speed, regardless of actual game speed.
+        this.xPos -= BackgroundEl.config.SPEED;
+      }
+      this.draw();
+
+      // Mark as removable if no longer in the canvas.
+      if (!this.isVisible()) {
+        this.remove = true;
+      }
+    }
+  },
+
+  /**
+   * Check if the element is visible on the stage.
+   * @return {boolean}
+   */
+  isVisible() {
+    return this.xPos + this.spriteConfig.WIDTH > 0;
+  },
+};
+
+
+
+//******************************************************************************
+
+/**
+ * Nightmode shows a moon and stars on the horizon.
+ * @param {HTMLCanvasElement} canvas
+ * @param {number} spritePos
+ * @param {number} containerWidth
+ * @constructor
+ */
+function NightMode(canvas, spritePos, containerWidth) {
+  this.spritePos = spritePos;
+  this.canvas = canvas;
+  this.canvasCtx =
+      /** @type {CanvasRenderingContext2D} */ (canvas.getContext('2d'));
+  this.xPos = containerWidth - 50;
+  this.yPos = 30;
+  this.currentPhase = 0;
+  this.opacity = 0;
+  this.containerWidth = containerWidth;
+  this.stars = [];
+  this.drawStars = false;
+  this.placeStars();
+}
+
+/**
+ * @enum {number}
+ */
+NightMode.config = {
+  FADE_SPEED: 0.035,
+  HEIGHT: 40,
+  MOON_SPEED: 0.25,
+  NUM_STARS: 2,
+  STAR_SIZE: 9,
+  STAR_SPEED: 0.3,
+  STAR_MAX_Y: 70,
+  WIDTH: 20,
+};
+
+NightMode.phases = [140, 120, 100, 60, 40, 20, 0];
+
+NightMode.prototype = {
+  /**
+   * Update moving moon, changing phases.
+   * @param {boolean} activated Whether night mode is activated.
+   */
+  update(activated) {
+    // Moon phase.
+    if (activated && this.opacity === 0) {
+      this.currentPhase++;
+
+      if (this.currentPhase >= NightMode.phases.length) {
+        this.currentPhase = 0;
+      }
+    }
+
+    // Fade in / out.
+    if (activated && (this.opacity < 1 || this.opacity === 0)) {
+      this.opacity += NightMode.config.FADE_SPEED;
+    } else if (this.opacity > 0) {
+      this.opacity -= NightMode.config.FADE_SPEED;
+    }
+
+    // Set moon positioning.
+    if (this.opacity > 0) {
+      this.xPos = this.updateXPos(this.xPos, NightMode.config.MOON_SPEED);
+
+      // Update stars.
+      if (this.drawStars) {
+        for (let i = 0; i < NightMode.config.NUM_STARS; i++) {
+          this.stars[i].x =
+              this.updateXPos(this.stars[i].x, NightMode.config.STAR_SPEED);
+        }
+      }
+      this.draw();
+    } else {
+      this.opacity = 0;
+      this.placeStars();
+    }
+    this.drawStars = true;
+  },
+
+  updateXPos(currentPos, speed) {
+    if (currentPos < -NightMode.config.WIDTH) {
+      currentPos = this.containerWidth;
+    } else {
+      currentPos -= speed;
+    }
+    return currentPos;
+  },
+
+  draw() {
+    let moonSourceWidth = this.currentPhase === 3 ? NightMode.config.WIDTH * 2 :
+                                                    NightMode.config.WIDTH;
+    let moonSourceHeight = NightMode.config.HEIGHT;
+    let moonSourceX = this.spritePos.x + NightMode.phases[this.currentPhase];
+    const moonOutputWidth = moonSourceWidth;
+    let starSize = NightMode.config.STAR_SIZE;
+    let starSourceX = spriteDefinitionByType.original.LDPI.STAR.x;
+
+    if (IS_HIDPI) {
+      moonSourceWidth *= 2;
+      moonSourceHeight *= 2;
+      moonSourceX = this.spritePos.x +
+          (NightMode.phases[this.currentPhase] * 2);
+      starSize *= 2;
+      starSourceX = spriteDefinitionByType.original.HDPI.STAR.x;
+    }
+
+    this.canvasCtx.save();
+    this.canvasCtx.globalAlpha = this.opacity;
+
+    // Stars.
+    if (this.drawStars) {
+      for (let i = 0; i < NightMode.config.NUM_STARS; i++) {
+        this.canvasCtx.drawImage(
+            Runner.origImageSprite, starSourceX, this.stars[i].sourceY,
+            starSize, starSize, Math.round(this.stars[i].x), this.stars[i].y,
+            NightMode.config.STAR_SIZE, NightMode.config.STAR_SIZE);
+      }
+    }
+
+    // Moon.
+    this.canvasCtx.drawImage(
+        Runner.origImageSprite, moonSourceX, this.spritePos.y, moonSourceWidth,
+        moonSourceHeight, Math.round(this.xPos), this.yPos, moonOutputWidth,
+        NightMode.config.HEIGHT);
+
+    this.canvasCtx.globalAlpha = 1;
+    this.canvasCtx.restore();
+  },
+
+  // Do star placement.
+  placeStars() {
+    const segmentSize = Math.round(this.containerWidth /
+        NightMode.config.NUM_STARS);
+
+    for (let i = 0; i < NightMode.config.NUM_STARS; i++) {
+      this.stars[i] = {};
+      this.stars[i].x = getRandomNum(segmentSize * i, segmentSize * (i + 1));
+      this.stars[i].y = getRandomNum(0, NightMode.config.STAR_MAX_Y);
+
+      if (IS_HIDPI) {
+        this.stars[i].sourceY = spriteDefinitionByType.original.HDPI.STAR.y +
+            NightMode.config.STAR_SIZE * 2 * i;
+      } else {
+        this.stars[i].sourceY = spriteDefinitionByType.original.LDPI.STAR.y +
+            NightMode.config.STAR_SIZE * i;
+      }
+    }
+  },
+
+  reset() {
+    this.currentPhase = 0;
+    this.opacity = 0;
+    this.update(false);
+  },
+
+};
+
+
+//******************************************************************************
+
+/**
+ * Horizon Line.
+ * Consists of two connecting lines. Randomly assigns a flat / bumpy horizon.
+ * @param {HTMLCanvasElement} canvas
+ * @param {Object} lineConfig Configuration object.
+ * @constructor
+ */
+function HorizonLine(canvas, lineConfig) {
+  let sourceX = lineConfig.SOURCE_X;
+  let sourceY = lineConfig.SOURCE_Y;
+
+  if (IS_HIDPI) {
+    sourceX *= 2;
+    sourceY *= 2;
+  }
+
+  this.spritePos = {x: sourceX, y: sourceY};
+  this.canvas = canvas;
+  this.canvasCtx =
+      /** @type {CanvasRenderingContext2D} */ (canvas.getContext('2d'));
+  this.sourceDimensions = {};
+  this.dimensions = lineConfig;
+
+  this.sourceXPos = [this.spritePos.x, this.spritePos.x +
+      this.dimensions.WIDTH];
+  this.xPos = [];
+  this.yPos = 0;
+  this.bumpThreshold = 0.5;
+
+  this.setSourceDimensions(lineConfig);
+  this.draw();
+}
+
+
+/**
+ * Horizon line dimensions.
+ * @enum {number}
+ */
+HorizonLine.dimensions = {
+  WIDTH: 600,
+  HEIGHT: 12,
+  YPOS: 127,
+};
+
+
+HorizonLine.prototype = {
+  /**
+   * Set the source dimensions of the horizon line.
+   */
+  setSourceDimensions(newDimensions) {
+    for (const dimension in newDimensions) {
+      if (dimension !== 'SOURCE_X' && dimension !== 'SOURCE_Y') {
+        if (IS_HIDPI) {
+          if (dimension !== 'YPOS') {
+            this.sourceDimensions[dimension] = newDimensions[dimension] * 2;
+          }
+        } else {
+          this.sourceDimensions[dimension] = newDimensions[dimension];
+        }
+        this.dimensions[dimension] = newDimensions[dimension];
+      }
+    }
+
+    this.xPos = [0, newDimensions.WIDTH];
+    this.yPos = newDimensions.YPOS;
+  },
+
+  /**
+   * Return the crop x position of a type.
+   */
+  getRandomType() {
+    return Math.random() > this.bumpThreshold ? this.dimensions.WIDTH : 0;
+  },
+
+  /**
+   * Draw the horizon line.
+   */
+  draw() {
+    this.canvasCtx.drawImage(Runner.imageSprite, this.sourceXPos[0],
+        this.spritePos.y,
+        this.sourceDimensions.WIDTH, this.sourceDimensions.HEIGHT,
+        this.xPos[0], this.yPos,
+        this.dimensions.WIDTH, this.dimensions.HEIGHT);
+
+    this.canvasCtx.drawImage(Runner.imageSprite, this.sourceXPos[1],
+        this.spritePos.y,
+        this.sourceDimensions.WIDTH, this.sourceDimensions.HEIGHT,
+        this.xPos[1], this.yPos,
+        this.dimensions.WIDTH, this.dimensions.HEIGHT);
+  },
+
+  /**
+   * Update the x position of an indivdual piece of the line.
+   * @param {number} pos Line position.
+   * @param {number} increment
+   */
+  updateXPos(pos, increment) {
+    const line1 = pos;
+    const line2 = pos === 0 ? 1 : 0;
+
+    this.xPos[line1] -= increment;
+    this.xPos[line2] = this.xPos[line1] + this.dimensions.WIDTH;
+
+    if (this.xPos[line1] <= -this.dimensions.WIDTH) {
+      this.xPos[line1] += this.dimensions.WIDTH * 2;
+      this.xPos[line2] = this.xPos[line1] - this.dimensions.WIDTH;
+      this.sourceXPos[line1] = this.getRandomType() + this.spritePos.x;
+    }
+  },
+
+  /**
+   * Update the horizon line.
+   * @param {number} deltaTime
+   * @param {number} speed
+   */
+  update(deltaTime, speed) {
+    const increment = Math.floor(speed * (FPS / 1000) * deltaTime);
+
+    if (this.xPos[0] <= 0) {
+      this.updateXPos(0, increment);
+    } else {
+      this.updateXPos(1, increment);
+    }
+    this.draw();
+  },
+
+  /**
+   * Reset horizon to the starting position.
+   */
+  reset() {
+    this.xPos[0] = 0;
+    this.xPos[1] = this.dimensions.WIDTH;
+  },
+};
+
+
+//******************************************************************************
+
+/**
+ * Horizon background class.
+ * @param {HTMLCanvasElement} canvas
+ * @param {Object} spritePos Sprite positioning.
+ * @param {Object} dimensions Canvas dimensions.
+ * @param {number} gapCoefficient
+ * @constructor
+ */
+function Horizon(canvas, spritePos, dimensions, gapCoefficient) {
+  this.canvas = canvas;
+  this.canvasCtx =
+      /** @type {CanvasRenderingContext2D} */ (this.canvas.getContext('2d'));
+  this.config = Horizon.config;
+  this.dimensions = dimensions;
+  this.gapCoefficient = gapCoefficient;
+  this.obstacles = [];
+  this.obstacleHistory = [];
+  this.horizonOffsets = [0, 0];
+  this.cloudFrequency = this.config.CLOUD_FREQUENCY;
+  this.spritePos = spritePos;
+  this.nightMode = null;
+  this.altGameModeActive = false;
+
+  // Cloud
+  this.clouds = [];
+  this.cloudSpeed = this.config.BG_CLOUD_SPEED;
+
+  // Background elements
+  this.backgroundEls = [];
+  this.lastEl = null;
+  this.backgroundSpeed = this.config.BG_CLOUD_SPEED;
+
+  // Horizon
+  this.horizonLine = null;
+  this.horizonLines = [];
+  this.init();
+}
+
+
+/**
+ * Horizon config.
+ * @enum {number}
+ */
+Horizon.config = {
+  BG_CLOUD_SPEED: 0.2,
+  BUMPY_THRESHOLD: .3,
+  CLOUD_FREQUENCY: .5,
+  HORIZON_HEIGHT: 16,
+  MAX_CLOUDS: 6,
+};
+
+
+Horizon.prototype = {
+  /**
+   * Initialise the horizon. Just add the line and a cloud. No obstacles.
+   */
+  init() {
+    Obstacle.types = spriteDefinitionByType.original.OBSTACLES;
+    this.addCloud();
+    // Multiple Horizon lines
+    for (let i = 0; i < Runner.spriteDefinition.LINES.length; i++) {
+      this.horizonLines.push(
+          new HorizonLine(this.canvas, Runner.spriteDefinition.LINES[i]));
+    }
+
+    this.nightMode = new NightMode(this.canvas, this.spritePos.MOON,
+        this.dimensions.WIDTH);
+  },
+
+  /**
+   * Update obstacle definitions based on the speed of the game.
+   */
+  adjustObstacleSpeed: function() {
+    for (let i = 0; i < Obstacle.types.length; i++) {
+      if (Runner.slowDown) {
+        Obstacle.types[i].multipleSpeed = Obstacle.types[i].multipleSpeed / 2;
+        Obstacle.types[i].minGap *= 1.5;
+        Obstacle.types[i].minSpeed = Obstacle.types[i].minSpeed / 2;
+
+        // Convert variable y position obstacles to fixed.
+        if (typeof (Obstacle.types[i].yPos) == 'object') {
+          Obstacle.types[i].yPos = Obstacle.types[i].yPos[0];
+          Obstacle.types[i].yPosMobile = Obstacle.types[i].yPos[0];
+        }
+      }
+    }
+  },
+
+  /**
+   * Update sprites to correspond to change in sprite sheet.
+   * @param {number} spritePos
+   */
+  enableAltGameMode: function(spritePos) {
+    // Clear existing horizon objects.
+    this.clouds = [];
+    this.backgroundEls = [];
+
+    this.altGameModeActive = true;
+    this.spritePos = spritePos;
+
+    Obstacle.types = Runner.spriteDefinition.OBSTACLES;
+    this.adjustObstacleSpeed();
+
+    Obstacle.MAX_GAP_COEFFICIENT = Runner.spriteDefinition.MAX_GAP_COEFFICIENT;
+    Obstacle.MAX_OBSTACLE_LENGTH = Runner.spriteDefinition.MAX_OBSTACLE_LENGTH;
+
+    BackgroundEl.config = Runner.spriteDefinition.BACKGROUND_EL_CONFIG;
+
+    this.horizonLines = [];
+    for (let i = 0; i < Runner.spriteDefinition.LINES.length; i++) {
+      this.horizonLines.push(
+          new HorizonLine(this.canvas, Runner.spriteDefinition.LINES[i]));
+    }
+    this.reset();
+  },
+
+  /**
+   * @param {number} deltaTime
+   * @param {number} currentSpeed
+   * @param {boolean} updateObstacles Used as an override to prevent
+   *     the obstacles from being updated / added. This happens in the
+   *     ease in section.
+   * @param {boolean} showNightMode Night mode activated.
+   */
+  update(deltaTime, currentSpeed, updateObstacles, showNightMode) {
+    this.runningTime += deltaTime;
+
+    if (this.altGameModeActive) {
+      this.updateBackgroundEls(deltaTime, currentSpeed);
+    }
+
+    for (let i = 0; i < this.horizonLines.length; i++) {
+      this.horizonLines[i].update(deltaTime, currentSpeed);
+    }
+
+    if (!this.altGameModeActive || Runner.spriteDefinition.HAS_CLOUDS) {
+      this.nightMode.update(showNightMode);
+      this.updateClouds(deltaTime, currentSpeed);
+    }
+
+    if (updateObstacles) {
+      this.updateObstacles(deltaTime, currentSpeed);
+    }
+  },
+
+  /**
+   * Update background element positions. Also handles creating new elements.
+   * @param {number} elSpeed
+   * @param {Array<Object>} bgElArray
+   * @param {number} maxBgEl
+   * @param {Function} bgElAddFunction
+   * @param {number} frequency
+   */
+  updateBackgroundEl(elSpeed, bgElArray, maxBgEl, bgElAddFunction, frequency) {
+    const numElements = bgElArray.length;
+
+    if (numElements) {
+      for (let i = numElements - 1; i >= 0; i--) {
+        bgElArray[i].update(elSpeed);
+      }
+
+      const lastEl = bgElArray[numElements - 1];
+
+      // Check for adding a new element.
+      if (numElements < maxBgEl &&
+          (this.dimensions.WIDTH - lastEl.xPos) > lastEl.gap &&
+          frequency > Math.random()) {
+        bgElAddFunction();
+      }
+    } else {
+      bgElAddFunction();
+    }
+  },
+
+  /**
+   * Update the cloud positions.
+   * @param {number} deltaTime
+   * @param {number} speed
+   */
+  updateClouds(deltaTime, speed) {
+    const elSpeed = this.cloudSpeed / 1000 * deltaTime * speed;
+    this.updateBackgroundEl(
+        elSpeed, this.clouds, this.config.MAX_CLOUDS, this.addCloud.bind(this),
+        this.cloudFrequency);
+
+    // Remove expired elements.
+    this.clouds = this.clouds.filter((obj) => !obj.remove);
+  },
+
+  /**
+   * Update the background element positions.
+   * @param {number} deltaTime
+   * @param {number} speed
+   */
+  updateBackgroundEls(deltaTime, speed) {
+    this.updateBackgroundEl(
+        deltaTime, this.backgroundEls, BackgroundEl.config.MAX_BG_ELS,
+        this.addBackgroundEl.bind(this), this.cloudFrequency);
+
+    // Remove expired elements.
+    this.backgroundEls = this.backgroundEls.filter((obj) => !obj.remove);
+  },
+
+  /**
+   * Update the obstacle positions.
+   * @param {number} deltaTime
+   * @param {number} currentSpeed
+   */
+  updateObstacles(deltaTime, currentSpeed) {
+    const updatedObstacles = this.obstacles.slice(0);
+
+    for (let i = 0; i < this.obstacles.length; i++) {
+      const obstacle = this.obstacles[i];
+      obstacle.update(deltaTime, currentSpeed);
+
+      // Clean up existing obstacles.
+      if (obstacle.remove) {
+        updatedObstacles.shift();
+      }
+    }
+    this.obstacles = updatedObstacles;
+
+    if (this.obstacles.length > 0) {
+      const lastObstacle = this.obstacles[this.obstacles.length - 1];
+
+      if (lastObstacle && !lastObstacle.followingObstacleCreated &&
+          lastObstacle.isVisible() &&
+          (lastObstacle.xPos + lastObstacle.width + lastObstacle.gap) <
+          this.dimensions.WIDTH) {
+        this.addNewObstacle(currentSpeed);
+        lastObstacle.followingObstacleCreated = true;
+      }
+    } else {
+      // Create new obstacles.
+      this.addNewObstacle(currentSpeed);
+    }
+  },
+
+  removeFirstObstacle() {
+    this.obstacles.shift();
+  },
+
+  /**
+   * Add a new obstacle.
+   * @param {number} currentSpeed
+   */
+  addNewObstacle(currentSpeed) {
+    const obstacleCount =
+        Obstacle.types[Obstacle.types.length - 1].type != 'COLLECTABLE' ||
+            (Runner.isAltGameModeEnabled() && !this.altGameModeActive ||
+             this.altGameModeActive) ?
+        Obstacle.types.length - 1 :
+        Obstacle.types.length - 2;
+    const obstacleTypeIndex =
+        obstacleCount > 0 ? getRandomNum(0, obstacleCount) : 0;
+    const obstacleType = Obstacle.types[obstacleTypeIndex];
+
+    // Check for multiples of the same type of obstacle.
+    // Also check obstacle is available at current speed.
+    if ((obstacleCount > 0 && this.duplicateObstacleCheck(obstacleType.type)) ||
+        currentSpeed < obstacleType.minSpeed) {
+      this.addNewObstacle(currentSpeed);
+    } else {
+      const obstacleSpritePos = this.spritePos[obstacleType.type];
+
+      this.obstacles.push(new Obstacle(
+          this.canvasCtx, obstacleType, obstacleSpritePos, this.dimensions,
+          this.gapCoefficient, currentSpeed, obstacleType.width,
+          this.altGameModeActive));
+
+      this.obstacleHistory.unshift(obstacleType.type);
+
+      if (this.obstacleHistory.length > 1) {
+        this.obstacleHistory.splice(Runner.config.MAX_OBSTACLE_DUPLICATION);
+      }
+    }
+  },
+
+  /**
+   * Returns whether the previous two obstacles are the same as the next one.
+   * Maximum duplication is set in config value MAX_OBSTACLE_DUPLICATION.
+   * @return {boolean}
+   */
+  duplicateObstacleCheck(nextObstacleType) {
+    let duplicateCount = 0;
+
+    for (let i = 0; i < this.obstacleHistory.length; i++) {
+      duplicateCount =
+          this.obstacleHistory[i] === nextObstacleType ? duplicateCount + 1 : 0;
+    }
+    return duplicateCount >= Runner.config.MAX_OBSTACLE_DUPLICATION;
+  },
+
+  /**
+   * Reset the horizon layer.
+   * Remove existing obstacles and reposition the horizon line.
+   */
+  reset() {
+    this.obstacles = [];
+    for (let l = 0; l < this.horizonLines.length; l++) {
+      this.horizonLines[l].reset();
+    }
+
+    this.nightMode.reset();
+  },
+
+  /**
+   * Update the canvas width and scaling.
+   * @param {number} width Canvas width.
+   * @param {number} height Canvas height.
+   */
+  resize(width, height) {
+    this.canvas.width = width;
+    this.canvas.height = height;
+  },
+
+  /**
+   * Add a new cloud to the horizon.
+   */
+  addCloud() {
+    this.clouds.push(new Cloud(this.canvas, this.spritePos.CLOUD,
+        this.dimensions.WIDTH));
+  },
+
+  /**
+   * Add a random background element to the horizon.
+   */
+  addBackgroundEl() {
+    const backgroundElTypes =
+        Object.keys(Runner.spriteDefinition.BACKGROUND_EL);
+
+    if (backgroundElTypes.length > 0) {
+      let index = getRandomNum(0, backgroundElTypes.length - 1);
+      let type = backgroundElTypes[index];
+
+      // Add variation if available.
+      while (type == this.lastEl && backgroundElTypes.length > 1) {
+        index = getRandomNum(0, backgroundElTypes.length - 1);
+        type = backgroundElTypes[index];
+      }
+
+      this.lastEl = type;
+      this.backgroundEls.push(new BackgroundEl(
+          this.canvas, this.spritePos.BACKGROUND_EL, this.dimensions.WIDTH,
+          type));
+    }
+  },
+};
+
+// Copyright 2013 The Chromium Authors
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+
+function toggleHelpBox() {
+  const helpBoxOuter = document.getElementById('details');
+  helpBoxOuter.classList.toggle(HIDDEN_CLASS);
+  const detailsButton = document.getElementById('details-button');
+  if (helpBoxOuter.classList.contains(HIDDEN_CLASS)) {
+    /** @suppress {missingProperties} */
+    detailsButton.innerText = detailsButton.detailsText;
+  } else {
+    /** @suppress {missingProperties} */
+    detailsButton.innerText = detailsButton.hideDetailsText;
+  }
+
+  // Details appears over the main content on small screens.
+  if (mobileNav) {
+    document.getElementById('main-content').classList.toggle(HIDDEN_CLASS);
+    const runnerContainer = document.querySelector('.runner-container');
+    if (runnerContainer) {
+      runnerContainer.classList.toggle(HIDDEN_CLASS);
+    }
+  }
+}
+
+function diagnoseErrors() {
+  if (window.errorPageController) {
+    window.errorPageController.diagnoseErrorsButtonClick();
+  }
+}
+
+// Subframes use a different layout but the same html file.  This is to make it
+// easier to support platforms that load the error page via different
+// mechanisms (Currently just iOS).
+let isSubFrame = false;
+if (window.top.location !== window.location) {
+  document.documentElement.setAttribute('subframe', '');
+  isSubFrame = true;
+}
+
+// Re-renders the error page using |strings| as the dictionary of values.
+// Used by NetErrorTabHelper to update DNS error pages with probe results.
+function updateForDnsProbe(strings) {
+  const context = new JsEvalContext(strings);
+  jstProcess(context, document.body);
+  onDocumentLoadOrUpdate();
+}
+
+// Adds an icon class to the list and removes classes previously set.
+function updateIconClass(newClass) {
+  const frameSelector = isSubFrame ? '#sub-frame-error' : '#main-frame-error';
+  const iconEl = document.querySelector(frameSelector + ' .icon');
+
+  if (iconEl.classList.contains(newClass)) {
+    return;
+  }
+
+  iconEl.className = 'icon ' + newClass;
+}
+
+// Implements button clicks.  This function is needed during the transition
+// between implementing these in trunk chromium and implementing them in iOS.
+function reloadButtonClick(url) {
+  if (window.errorPageController) {
+    // 
+
+    // 
+    window.errorPageController.reloadButtonClick();
+    // 
+  } else {
+    window.location = url;
+  }
+}
+
+function downloadButtonClick() {
+  if (window.errorPageController) {
+    window.errorPageController.downloadButtonClick();
+    const downloadButton = document.getElementById('download-button');
+    downloadButton.disabled = true;
+    /** @suppress {missingProperties} */
+    downloadButton.textContent = downloadButton.disabledText;
+
+    document.getElementById('download-link-wrapper')
+        .classList.add(HIDDEN_CLASS);
+    document.getElementById('download-link-clicked-wrapper')
+        .classList.remove(HIDDEN_CLASS);
+  }
+}
+
+function detailsButtonClick() {
+  if (window.errorPageController) {
+    window.errorPageController.detailsButtonClick();
+  }
+}
+// clang-format off
+// 
+
+function setAutoFetchState(scheduled, can_schedule) {
+  document.getElementById('cancel-save-page-button')
+      .classList.toggle(HIDDEN_CLASS, !scheduled);
+  document.getElementById('save-page-for-later-button')
+      .classList.toggle(HIDDEN_CLASS, scheduled || !can_schedule);
+}
+
+function savePageLaterClick() {
+  window.errorPageController.savePageForLater();
+  // savePageForLater will eventually trigger a call to setAutoFetchState() when
+  // it completes.
+}
+
+function cancelSavePageClick() {
+  window.errorPageController.cancelSavePage();
+  // setAutoFetchState is not called in response to cancelSavePage(), so do it
+  // now.
+  setAutoFetchState(false, true);
+}
+
+function toggleErrorInformationPopup() {
+  document.getElementById('error-information-popup-container')
+      .classList.toggle(HIDDEN_CLASS);
+}
+
+function launchDownloadsPage() {
+  window.errorPageController.launchDownloadsPage();
+}
+
+function toggleOfflineContentListVisibility(updatePref) {
+  if (!loadTimeData.valueExists('offlineContentList')) {
+    return;
+  }
+
+  const contentListElement = document.getElementById('offline-content-list');
+  const isVisible = !contentListElement.classList.toggle('list-hidden');
+
+  if (updatePref && window.errorPageController) {
+    window.errorPageController.listVisibilityChanged(isVisible);
+  }
+}
+
+// Called on document load, and from updateForDnsProbe().
+function onDocumentLoadOrUpdate() {
+  const downloadButtonVisible = loadTimeData.valueExists('downloadButton') &&
+      loadTimeData.getValue('downloadButton').msg;
+  const detailsButton = document.getElementById('details-button');
+
+  // If offline content suggestions will be visible, the usual buttons will not
+  // be presented.
+  const offlineContentVisible =
+      loadTimeData.valueExists('suggestedOfflineContentPresentation');
+  if (offlineContentVisible) {
+    document.querySelector('.nav-wrapper').classList.add(HIDDEN_CLASS);
+    detailsButton.classList.add(HIDDEN_CLASS);
+
+    document.getElementById('download-link').hidden = !downloadButtonVisible;
+    document.getElementById('download-links-wrapper')
+        .classList.remove(HIDDEN_CLASS);
+    document.getElementById('error-information-popup-container')
+        .classList.add('use-popup-container', HIDDEN_CLASS);
+    document.getElementById('error-information-button')
+        .classList.remove(HIDDEN_CLASS);
+  }
+
+  loadTimeData.valueExists('attemptAutoFetch') &&
+      loadTimeData.getValue('attemptAutoFetch');
+
+  const reloadButtonVisible = loadTimeData.valueExists('reloadButton') &&
+      loadTimeData.getValue('reloadButton').msg;
+
+  const reloadButton = document.getElementById('reload-button');
+  const downloadButton = document.getElementById('download-button');
+  if (reloadButton.style.display === 'none' &&
+      downloadButton.style.display === 'none') {
+    detailsButton.classList.add('singular');
+  }
+
+  // Show or hide control buttons.
+  const controlButtonDiv = document.getElementById('control-buttons');
+  controlButtonDiv.hidden =
+      offlineContentVisible || !(reloadButtonVisible || downloadButtonVisible);
+
+  const iconClass = loadTimeData.valueExists('iconClass') &&
+      loadTimeData.getValue('iconClass');
+
+  updateIconClass(iconClass);
+
+  if (!isSubFrame && iconClass === 'icon-offline') {
+    document.documentElement.classList.add('offline');
+    new Runner('.interstitial-wrapper');
+  }
+}
+
+function onDocumentLoad() {
+  // `loadTimeDataRaw` is injected to the `window` scope from C++.
+  loadTimeData.data = window.loadTimeDataRaw;
+  jstProcess(new JsEvalContext(window.loadTimeDataRaw), document.body);
+
+  // Sets up the proper button layout for the current platform.
+  const buttonsDiv = document.getElementById('buttons');
+  {
+    buttonsDiv.classList.add('suggested-left');
+  }
+
+  onDocumentLoadOrUpdate();
+}
+
+// Expose methods that are triggered either
+//  - By `onclick=...` handlers in the HTML code, OR
+//  - By `href="javascript:..."` in localized links.
+//  - By inected JS code coming from C++
+//
+//  since those need to be available on the 'window' object.
+Object.assign(window, {
+  cancelSavePageClick,
+  detailsButtonClick,
+  diagnoseErrors,
+  downloadButtonClick,
+  launchDownloadsPage,
+  reloadButtonClick,
+  savePageLaterClick,
+  toggleErrorInformationPopup,
+  toggleHelpBox,
+  toggleOfflineContentListVisibility,
+  updateForDnsProbe,
+});
+
+document.addEventListener('DOMContentLoaded', onDocumentLoad);
+//# sourceMappingURL=neterror.rollup.js.map
+</script>
+</head>
+<body class="neterror" style="font-family: &#39;Segoe UI&#39;, Tahoma, sans-serif; font-size: 75%" jstcache="0">
+  <div id="main-frame-error" class="interstitial-wrapper" jstcache="0">
+    <div id="main-content" jstcache="0">
+      <div class="icon" jstcache="0"></div>
+      <div id="main-message" jstcache="0">
+        <h1 jstcache="0">
+          <span jsselect="heading" jsvalues=".innerHTML:msg" jstcache="9"><span jscontent="hostName" jstcache="22">td.doubleclick.net</span> is blocked</span>
+          <a id="error-information-button" class="hidden" onclick="toggleErrorInformationPopup();" jstcache="0"></a>
+        </h1>
+        <p jsselect="summary" jsvalues=".innerHTML:msg" jstcache="1">This content is blocked. Contact the site owner to fix the issue.</p>
+        <!--The suggestion list and error code are normally presented inline,
+          in which case error-information-popup-* divs have no effect. When
+          error-information-popup-container has the use-popup-container class, this
+          information is provided in a popup instead.-->
+        <div id="error-information-popup-container" jstcache="0">
+          <div id="error-information-popup" jstcache="0">
+            <div id="error-information-popup-box" jstcache="0">
+              <div id="error-information-popup-content" jstcache="0">
+                <div id="suggestions-list" style="display:none" jsdisplay="(suggestionsSummaryList &amp;&amp; suggestionsSummaryList.length)" jstcache="16">
+                  <p jsvalues=".innerHTML:suggestionsSummaryListHeader" jstcache="18"></p>
+                  <ul jsvalues=".className:suggestionsSummaryList.length == 1 ? &#39;single-suggestion&#39; : &#39;&#39;" jstcache="19">
+                    <li jsselect="suggestionsSummaryList" jsvalues=".innerHTML:summary" jstcache="21"></li>
+                  </ul>
+                </div>
+                <div class="error-code" jscontent="errorCode" jstcache="17">ERR_BLOCKED_BY_CSP</div>
+                <p id="error-information-popup-close" jstcache="0">
+                  <a class="link-button" jscontent="closeDescriptionPopup" onclick="toggleErrorInformationPopup();" jstcache="20">null</a>
+                </p>
+              </div>
+            </div>
+          </div>
+        </div>
+        <div id="download-links-wrapper" class="hidden" jstcache="0">
+          <div id="download-link-wrapper" jstcache="0">
+            <a id="download-link" class="link-button" onclick="downloadButtonClick()" jsselect="downloadButton" jscontent="msg" jsvalues=".disabledText:disabledMsg" jstcache="6" style="display: none;">
+            </a>
+          </div>
+          <div id="download-link-clicked-wrapper" class="hidden" jstcache="0">
+            <div id="download-link-clicked" class="link-button" jsselect="downloadButton" jscontent="disabledMsg" jstcache="11" style="display: none;">
+            </div>
+          </div>
+        </div>
+        <div id="save-page-for-later-button" class="hidden" jstcache="0">
+          <a class="link-button" onclick="savePageLaterClick()" jsselect="savePageLater" jscontent="savePageMsg" jstcache="10" style="display: none;">
+          </a>
+        </div>
+        <div id="cancel-save-page-button" class="hidden" onclick="cancelSavePageClick()" jsselect="savePageLater" jsvalues=".innerHTML:cancelMsg" jstcache="4" style="display: none;">
+        </div>
+        <div id="offline-content-list" class="list-hidden" hidden="" jstcache="0">
+          <div id="offline-content-list-visibility-card" onclick="toggleOfflineContentListVisibility(true)" jstcache="0">
+            <div id="offline-content-list-title" jsselect="offlineContentList" jscontent="title" jstcache="12" style="display: none;">
+            </div>
+            <div jstcache="0">
+              <div id="offline-content-list-show-text" jsselect="offlineContentList" jscontent="showText" jstcache="14" style="display: none;">
+              </div>
+              <div id="offline-content-list-hide-text" jsselect="offlineContentList" jscontent="hideText" jstcache="15" style="display: none;">
+              </div>
+            </div>
+          </div>
+          <div id="offline-content-suggestions" jstcache="0"></div>
+          <div id="offline-content-list-action" jstcache="0">
+            <a class="link-button" onclick="launchDownloadsPage()" jsselect="offlineContentList" jscontent="actionText" jstcache="13" style="display: none;">
+            </a>
+          </div>
+        </div>
+      </div>
+    </div>
+    <div id="buttons" class="nav-wrapper suggested-left" jstcache="0">
+      <div id="control-buttons" hidden="" jstcache="0">
+        <button id="reload-button" class="blue-button text-button" onclick="reloadButtonClick(this.url);" jsselect="reloadButton" jsvalues=".url:reloadUrl" jscontent="msg" jstcache="5" style="display: none;"></button>
+        <button id="download-button" class="blue-button text-button" onclick="downloadButtonClick()" jsselect="downloadButton" jscontent="msg" jsvalues=".disabledText:disabledMsg" jstcache="6" style="display: none;">
+        </button>
+      </div>
+      <button id="details-button" class="secondary-button text-button small-link singular" onclick="detailsButtonClick(); toggleHelpBox()" jscontent="details" jsdisplay="(suggestionsDetails &amp;&amp; suggestionsDetails.length &gt; 0) || diagnose" jsvalues=".detailsText:details; .hideDetailsText:hideDetails;" jstcache="2" style="display: none;"></button>
+    </div>
+    <div id="details" class="hidden" jstcache="0">
+      <div class="suggestions" jsselect="suggestionsDetails" jstcache="3" jsinstance="*0" style="display: none;">
+        <div class="suggestion-header" jsvalues=".innerHTML:header" jstcache="7"></div>
+        <div class="suggestion-body" jsvalues=".innerHTML:body" jstcache="8"></div>
+      </div>
+    </div>
+  </div>
+  <div id="sub-frame-error" jstcache="0">
+    <!-- Show details when hovering over the icon, in case the details are
+         hidden because they're too large. -->
+    <div class="icon icon-generic" jstcache="0"></div>
+    <div id="sub-frame-error-details" jsselect="summary" jsvalues=".innerHTML:msg" jstcache="1">This content is blocked. Contact the site owner to fix the issue.</div>
+  </div>
+
+  <div id="offline-resources" jstcache="0">
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