feat(web-components): add Tooltip component

change/@fluentui-web-components-037cbaec-4ee8-4f24-8cb7-1ae8ea8546f4.json

@@ -0,0 +1,7 @@
+{
+  "type": "prerelease",
+  "comment": "feat: add Tooltip component",
+  "packageName": "@fluentui/web-components",
+  "email": "rupertdavid@microsoft.com",
+  "dependentChangeType": "patch"
+}

packages/web-components/docs/api-report.md

@@ -4029,6 +4029,55 @@ export const ToggleButtonStyles: ElementStyles;
 // @public
 export const ToggleButtonTemplate: ElementViewTemplate<ToggleButton>;
 
+// @public
+export class Tooltip extends FASTElement {
+    constructor();
+    anchor: string;
+    // (undocumented)
+    connectedCallback(): void;
+    delay?: number;
+    // (undocumented)
+    disconnectedCallback(): void;
+    elementInternals: ElementInternals;
+    handleBlur: () => void;
+    handleFocus: () => void;
+    handleMouseEnter: () => void;
+    handleMouseLeave: () => void;
+    // @internal
+    hideTooltip(delay?: number): void;
+    positioning: string;
+    // @internal
+    showTooltip(delay?: number): void;
+}
+
+// @public
+export const TooltipDefinition: FASTElementDefinition<typeof Tooltip>;
+
+// @public
+export const TooltipPositioning: {
+    'above-start': string;
+    above: string;
+    'above-end': string;
+    'below-start': string;
+    below: string;
+    'below-end': string;
+    'before-top': string;
+    before: string;
+    'before-bottom': string;
+    'after-top': string;
+    after: string;
+    'after-bottom': string;
+};
+
+// @public
+export type TooltipPositioning = ValuesOf<typeof TooltipPositioning>;
+
+// @public
+export const TooltipStyles: ElementStyles;
+
+// @public
+export const TooltipTemplate: ViewTemplate<Tooltip, any>;
+
 // Warning: (ae-missing-release-tag) "typographyBody1StrongerStyles" is part of the package's API, but it is missing a release tag (@alpha, @beta, @public, or @internal)
 //
 // @public (undocumented)

packages/web-components/src/index-rollup.ts

@@ -36,3 +36,4 @@ import './textarea/define.js';
 import './text-input/define.js';
 import './text/define.js';
 import './toggle-button/define.js';
+import './tooltip/define.js';

packages/web-components/src/index.ts

@@ -295,6 +295,7 @@ export {
   ToggleButtonTemplate,
 } from './toggle-button/index.js';
 export type { ToggleButtonOptions } from './toggle-button/index.js';
+export { Tooltip, TooltipDefinition, TooltipPositioning, TooltipStyles, TooltipTemplate } from './tooltip/index.js';
 export {
   darkModeStylesheetBehavior,
   forcedColorsStylesheetBehavior,

packages/web-components/src/tooltip/define.ts

@@ -0,0 +1,4 @@
+import { FluentDesignSystem } from '../fluent-design-system.js';
+import { definition } from './tooltip.definition.js';
+
+definition.define(FluentDesignSystem.registry);

packages/web-components/src/tooltip/index.ts

@@ -0,0 +1,5 @@
+export { definition as TooltipDefinition } from './tooltip.definition.js';
+export { Tooltip } from './tooltip.js';
+export { TooltipPositioning } from './tooltip.options.js';
+export { styles as TooltipStyles } from './tooltip.styles.js';
+export { template as TooltipTemplate } from './tooltip.template.js';

packages/web-components/src/tooltip/tooltip.definition.ts

@@ -0,0 +1,17 @@
+import { FluentDesignSystem } from '../fluent-design-system.js';
+import { Tooltip } from './tooltip.js';
+import { styles } from './tooltip.styles.js';
+import { template } from './tooltip.template.js';
+
+/**
+ * The {@link Tooltip } custom element definition.
+ *
+ * @public
+ * @remarks
+ * HTML Element: `<fluent-tooltip>`
+ */
+export const definition = Tooltip.compose({
+  name: `${FluentDesignSystem.prefix}-tooltip`,
+  template,
+  styles,
+});

packages/web-components/src/tooltip/tooltip.options.ts

@@ -0,0 +1,26 @@
+import type { ValuesOf } from '../utils/typings.js';
+
+/**
+ * The TooltipPositioning options and their corresponding CSS values
+ * @public
+ */
+export const TooltipPositioning = {
+  'above-start': 'block-start span-inline-end',
+  above: 'block-start',
+  'above-end': 'block-start span-inline-start',
+  'below-start': 'block-end span-inline-end',
+  below: 'block-end',
+  'below-end': 'block-end span-inline-start',
+  'before-top': 'inline-start span-block-end',
+  before: 'inline-start',
+  'before-bottom': 'inline-start span-block-start',
+  'after-top': 'inline-end span-block-end',
+  after: 'inline-end',
+  'after-bottom': 'inline-end span-block-start',
+};
+
+/**
+ * The TooltipPositioning type
+ * @public
+ */
+export type TooltipPositioning = ValuesOf<typeof TooltipPositioning>;

packages/web-components/src/tooltip/tooltip.spec.ts

@@ -0,0 +1,146 @@
+import { test } from '@playwright/test';
+import { expect, fixtureURL } from '../helpers.tests.js';
+import type { Tooltip } from './tooltip.js';
+
+test.describe('Tooltip', () => {
+  test.beforeEach(async ({ page }) => {
+    await page.goto(fixtureURL('components-tooltip-tooltip--tooltip'));
+    await page.waitForFunction(() => customElements.whenDefined('fluent-tooltip'));
+
+    await page.setContent(/* html */ `
+      <button id="target">Target</button>
+      <fluent-tooltip anchor="target">This is a tooltip</fluent-tooltip>
+    `);
+  });
+
+  /**
+   * ARIA APG Tooltip Pattern {@link https://www.w3.org/WAI/ARIA/apg/patterns/tooltip/ }
+   * ESC dismisses the tooltip.
+   * The element that serves as the tooltip container has role tooltip.
+   * The element that triggers the tooltip references the tooltip element with aria-describedby.
+   */
+  test('escape key should hide the tooltip', async ({ page }) => {
+    const element = page.locator('fluent-tooltip');
+    const button = page.locator('button');
+
+    await button.focus();
+    await expect(element).toBeVisible();
+    await page.keyboard.press('Escape');
+    await expect(element).toBeHidden();
+  });
+
+  test('should have the role set to `tooltip`', async ({ page }) => {
+    const element = page.locator('fluent-tooltip');
+    await expect(element).toHaveJSProperty('elementInternals.role', 'tooltip');
+  });
+
+  test('should have the `aria-describedby` attribute set to the tooltip id', async ({ page }) => {
+    const element = page.locator('fluent-tooltip');
+    const button = page.locator('button');
+
+    await expect(element).toHaveAttribute('id', 'tooltip-target');
+    await expect(button).toHaveAttribute('aria-describedby', 'tooltip-target');
+  });
+
+  test('should not be visible by default', async ({ page }) => {
+    const element = page.locator('fluent-tooltip');
+    await expect(element).toBeHidden();
+  });
+
+  test('default placement should be set to `above`', async ({ page }) => {
+    const element = page.locator('fluent-tooltip');
+    await expect(element).toHaveAttribute('positioning', 'above');
+  });
+
+  test('should show the tooltip on hover', async ({ page }) => {
+    const element = page.locator('fluent-tooltip');
+    const button = page.locator('button');
+
+    await expect(element).toBeHidden();
+    await button.hover();
+    await expect(element).toBeVisible();
+  });
+
+  test('should show the tooltip on focus', async ({ page }) => {
+    const element = page.locator('fluent-tooltip');
+    const button = page.locator('button');
+
+    await expect(element).toBeHidden();
+    await button.focus();
+    await expect(element).toBeVisible();
+    await button.blur();
+    await expect(element).toBeHidden();
+  });
+
+  test('position should be set to `above` when `positioning` is set to `above`', async ({ page }) => {
+    const element = page.locator('fluent-tooltip');
+    const button = page.locator('button');
+
+    await element.evaluate((node: Tooltip) => {
+      node.positioning = 'above';
+    });
+    await expect(element).toHaveAttribute('positioning', 'above');
+
+    // show the element to get the position
+    await button.focus();
+
+    const buttonTop = await button.evaluate((node: HTMLElement) => node.getBoundingClientRect().top);
+    const elementBottom = await element.evaluate((node: HTMLElement) => node.getBoundingClientRect().bottom);
+
+    await expect(buttonTop).toBeGreaterThan(elementBottom);
+  });
+
+  test('position should be set to `below` when `positioning` is set to `below`', async ({ page }) => {
+    const element = page.locator('fluent-tooltip');
+    const button = page.locator('button');
+
+    await element.evaluate((node: Tooltip) => {
+      node.positioning = 'below';
+    });
+    await expect(element).toHaveAttribute('positioning', 'below');
+
+    // show the element to get the position
+    await button.focus();
+
+    const buttonBottom = await button.evaluate((node: HTMLElement) => node.getBoundingClientRect().bottom);
+    const elementTop = await element.evaluate((node: HTMLElement) => node.getBoundingClientRect().top);
+
+    await expect(buttonBottom).toBeLessThan(elementTop);
+  });
+
+  test('position should be set to `before` when `positioning` is set to `before`', async ({ page }) => {
+    const element = page.locator('fluent-tooltip');
+    const button = page.locator('button');
+
+    await element.evaluate((node: Tooltip) => {
+      node.positioning = 'before';
+    });
+    await expect(element).toHaveAttribute('positioning', 'before');
+
+    // show the element to get the position
+    await button.focus();
+
+    const buttonLeft = await button.evaluate((node: HTMLElement) => node.getBoundingClientRect().left);
+    const elementRight = await element.evaluate((node: HTMLElement) => node.getBoundingClientRect().right);
+
+    await expect(buttonLeft).toBeGreaterThan(elementRight);
+  });
+
+  test('position should be set to `after` when `positioning` is set to `after`', async ({ page }) => {
+    const element = page.locator('fluent-tooltip');
+    const button = page.locator('button');
+
+    await element.evaluate((node: Tooltip) => {
+      node.positioning = 'after';
+    });
+    await expect(element).toHaveAttribute('positioning', 'after');
+
+    // show the element to get the position
+    await button.focus();
+
+    const buttonRight = await button.evaluate((node: HTMLElement) => node.getBoundingClientRect().right);
+    const elementLeft = await element.evaluate((node: HTMLElement) => node.getBoundingClientRect().left);
+
+    await expect(buttonRight).toBeLessThan(elementLeft);
+  });
+});