Clarify event retargeting, and mention inertness in the definition of .

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@@ -3298,6 +3298,9 @@ a.setAttribute('href', 'https://example.com/'); // change the content attribute
      <li><dfn data-x="event-compositionstart" data-x-href="https://w3c.github.io/uievents/#event-type-compositionstart"><code>compositionstart</code></dfn> event</li>
      <li><dfn data-x="event-compositionupdate" data-x-href="https://w3c.github.io/uievents/#event-type-compositionupdate"><code>compositionupdate</code></dfn> event</li>
      <li><dfn data-x="event-compositionend" data-x-href="https://w3c.github.io/uievents/#event-type-compositionend"><code>compositionend</code></dfn> event</li>
+
+     <li>The <dfn data-x="event-target" data-x-href="https://w3c.github.io/uievents/#event-target">event target</dfn> concept</li>
+     <li>The <dfn data-x="topmost-event-target" data-x-href="https://w3c.github.io/uievents/#topmost-event-target">topmost event target</dfn> concept</li>
   </ul>
 
     <p>The following features are defined in the Touch Events specification: <ref spec=TOUCH></p>
@@ -54946,8 +54949,9 @@ MIT Room 32-G524
 
    <dd>
 
-    <p>Changes the selection to cover the given substring in the given direction. If the direction
-    is omitted, it will be reset to be the platform default (none or forward).</p>
+    <p>If <var>element</var> is not <span>inert</span>, changes the selection to cover the given
+    substring in the given direction. If the direction is omitted, it will be reset to be the
+    platform default (none or forward).</p>
 
    </dd>
 
@@ -72523,20 +72527,35 @@ END:VCARD</pre>
     </ul>
    </li>
 
-   <li><p>if one of the above events would otherwise be fired on the element
-   as a result of a user interaction, where the process for determining the
-   event target entails "hit testing", the event must instead be targeted at
-   the non-inert ancestor of the element which would be the topmost "hit
-   testing" result for the point at which the interaction occurred, if the inert
-   element, its inert ancestors, and any unrelated elements were not
-   present;</p></li>
+   <li>
+    <p>if the <span>inert</span> element is the <span data-x="topmost-event-target">topmost event
+    target</span> for one of the above events, which would be fired as a result of user input, an
+    alternative <span data-x="event-target">event target</span> must be found as follows:</p>
+    <ol>
+     <li><p>Let <var>originalElement</var> be the <span data-x="topmost-event-target">topmost event
+     target</span> for the event.</p></li>
+     <li><p>Let <var>candidate</var> be the same element.</p></li>
+     <li><p>Let <var>ineligible</var> be an empty list.</p></li>
+     <li>
+      <p>While <var>candidate</var> is <span>inert</span>, or <var>candidate</var> is not an an
+      ancestor of <var>originalElement</var>:</p>
+      <ol>
+       <li><p>Add <var>candidate</var> to <var>ineligible</var>.</p></li>
+       <li><p>Let <var>candidate</var> be the element which would be the <span
+       data-x="topmost-event-target">topmost event target</span> if all the elements in
+       <var>ineligible</var> were excluded from consideration.</p></li>
+      </ol>
+     </li>
+     <li><p>If <var>candidate</var> is not null, let <var>candidate</var> be the new <span
+     data-x="event-target">event target</span>.</p></li>
+     <li><p>Otherwise, do not fire the event.</p></li>
+    </ol>
+   </li>
 
    <li><p>the user agent may ignore the node for the purposes of text search user interfaces
    (commonly known as "find in page"); and</p></li>
 
-   <li><p>the user agent may prevent the user from selecting text in that node, and may prevent
-   code calling <code data-x="dom-textarea/input-setSelectionRange">setSelectionRange()</code>
-   on the node.</p></li>
+   <li><p>the user agent may prevent the user from selecting text in that node.</p></li>
   </ul>
 
   <p>User agents should allow the user to override the restrictions on search and text selection,