fix(content): allow custom roles and aria attributes to be set on content (#29753)

Issue number: N/A

---------

## What is the current behavior?
Setting a custom `role` on the `ion-content` element does not work.

## What is the new behavior?
- Inherit attributes for the content element which allows a custom
`role` property to be set
- Adds e2e tests for content, header, and footer verifying that the
proper roles are assigned

## Does this introduce a breaking change?

- [ ] Yes
- [x] No

## Other information
To test this PR:

1. Switch to the branch and navigate to the `core/` directory
1. Make sure to run `npx playwright install` if it has not been updated
recenly
1. Run `npm run test.e2e src/components/content/test/a11y/`
1. Verify that the tests pass
1. Remove my fix in `core/src/components/content/content.tsx` and run
the test again
1. Verify that the `should allow for custom role` tests fail

Author: brandyscarney

core/src/components/content/content.tsx

@@ -1,6 +1,7 @@
 import type { ComponentInterface, EventEmitter } from '@stencil/core';
 import { Build, Component, Element, Event, Host, Listen, Method, Prop, forceUpdate, h, readTask } from '@stencil/core';
-import { componentOnReady, hasLazyBuild } from '@utils/helpers';
+import { componentOnReady, hasLazyBuild, inheritAriaAttributes } from '@utils/helpers';
+import type { Attributes } from '@utils/helpers';
 import { isPlatform } from '@utils/platform';
 import { isRTL } from '@utils/rtl';
 import { createColorClasses, hostContext } from '@utils/theme';
@@ -33,6 +34,7 @@ export class Content implements ComponentInterface {
   private backgroundContentEl?: HTMLElement;
   private isMainContent = true;
   private resizeTimeout: ReturnType<typeof setTimeout> | null = null;
+  private inheritedAttributes: Attributes = {};
 
   private tabsElement: HTMLElement | null = null;
   private tabsLoadCallback?: () => void;
@@ -125,6 +127,10 @@ export class Content implements ComponentInterface {
    */
   @Event() ionScrollEnd!: EventEmitter<ScrollBaseDetail>;
 
+  componentWillLoad() {
+    this.inheritedAttributes = inheritAriaAttributes(this.el);
+  }
+
   connectedCallback() {
     this.isMainContent = this.el.closest('ion-menu, ion-popover, ion-modal') === null;
 
@@ -432,7 +438,7 @@ export class Content implements ComponentInterface {
   }
 
   render() {
-    const { fixedSlotPlacement, isMainContent, scrollX, scrollY, el } = this;
+    const { fixedSlotPlacement, inheritedAttributes, isMainContent, scrollX, scrollY, el } = this;
     const rtl = isRTL(el) ? 'rtl' : 'ltr';
     const mode = getIonMode(this);
     const forceOverscroll = this.shouldForceOverscroll();
@@ -453,6 +459,7 @@ export class Content implements ComponentInterface {
           '--offset-top': `${this.cTop}px`,
           '--offset-bottom': `${this.cBottom}px`,
         }}
+        {...inheritedAttributes}
       >
         <div ref={(el) => (this.backgroundContentEl = el)} id="background-content" part="background"></div>
 

core/src/components/content/test/a11y/content.e2e.ts

@@ -0,0 +1,67 @@
+import { expect } from '@playwright/test';
+import { configs, test } from '@utils/test/playwright';
+
+/**
+ * Content does not have mode-specific styling
+ */
+configs({ modes: ['md'], directions: ['ltr'] }).forEach(({ title, config }) => {
+  test.describe(title('content: a11y'), () => {
+    test('should have the main role', async ({ page }) => {
+      await page.setContent(
+        `
+        <ion-content></ion-content>
+      `,
+        config
+      );
+      const content = page.locator('ion-content');
+
+      await expect(content).toHaveAttribute('role', 'main');
+    });
+
+    test('should have no role in popover', async ({ page }) => {
+      await page.setContent(
+        `
+        <ion-popover>
+          <ion-content></ion-content>
+        </ion-popover>
+      `,
+        config
+      );
+
+      const content = page.locator('ion-content');
+
+      /**
+       * Playwright can't do .not.toHaveAttribute() because a value is expected,
+       * and toHaveAttribute can't accept a value of type null.
+       */
+      const role = await content.getAttribute('role');
+      expect(role).toBeNull();
+    });
+
+    test('should allow for custom role', async ({ page }) => {
+      await page.setContent(
+        `
+        <ion-content role="complementary"></ion-content>
+      `,
+        config
+      );
+      const content = page.locator('ion-content');
+
+      await expect(content).toHaveAttribute('role', 'complementary');
+    });
+
+    test('should allow for custom role in popover', async ({ page }) => {
+      await page.setContent(
+        `
+        <ion-popover>
+          <ion-content role="complementary"></ion-content>
+        </ion-popover>
+      `,
+        config
+      );
+      const content = page.locator('ion-content');
+
+      await expect(content).toHaveAttribute('role', 'complementary');
+    });
+  });
+});

core/src/components/footer/test/a11y/footer.e2e.ts

@@ -0,0 +1,33 @@
+import { expect } from '@playwright/test';
+import { configs, test } from '@utils/test/playwright';
+
+/**
+ * Footer does not have mode-specific styling
+ */
+configs({ modes: ['md'], directions: ['ltr'] }).forEach(({ title, config }) => {
+  test.describe(title('footer: a11y'), () => {
+    test('should have the contentinfo role', async ({ page }) => {
+      await page.setContent(
+        `
+        <ion-footer></ion-footer>
+      `,
+        config
+      );
+      const footer = page.locator('ion-footer');
+
+      await expect(footer).toHaveAttribute('role', 'contentinfo');
+    });
+
+    test('should allow for custom role', async ({ page }) => {
+      await page.setContent(
+        `
+        <ion-footer role="complementary"></ion-footer>
+      `,
+        config
+      );
+      const footer = page.locator('ion-footer');
+
+      await expect(footer).toHaveAttribute('role', 'complementary');
+    });
+  });
+});

core/src/components/header/test/a11y/header.e2e.ts

@@ -15,20 +15,56 @@ configs({ modes: ['ios'], directions: ['ltr'] }).forEach(({ title, config }) =>
       expect(results.violations).toEqual([]);
     });
 
+    test('should have the banner role', async ({ page }) => {
+      await page.setContent(
+        `
+        <ion-header></ion-header>
+      `,
+        config
+      );
+      const header = page.locator('ion-header');
+
+      await expect(header).toHaveAttribute('role', 'banner');
+    });
+
+    test('should have no role in menu', async ({ page }) => {
+      await page.setContent(
+        `
+        <ion-menu>
+          <ion-header></ion-header>
+        </ion-menu>
+      `,
+        config
+      );
+      const header = page.locator('ion-header');
+
+      await expect(header).toHaveAttribute('role', 'none');
+    });
+
     test('should allow for custom role', async ({ page }) => {
-      /**
-       * Note: This example should not be used in production.
-       * This only serves to check that `role` can be customized.
-       */
       await page.setContent(
         `
-        <ion-header role="heading"></ion-header>
+        <ion-header role="complementary"></ion-header>
+      `,
+        config
+      );
+      const header = page.locator('ion-header');
+
+      await expect(header).toHaveAttribute('role', 'complementary');
+    });
+
+    test('should allow for custom role in menu', async ({ page }) => {
+      await page.setContent(
+        `
+        <ion-menu>
+          <ion-header role="complementary"></ion-header>
+        </ion-menu>
       `,
         config
       );
       const header = page.locator('ion-header');
 
-      await expect(header).toHaveAttribute('role', 'heading');
+      await expect(header).toHaveAttribute('role', 'complementary');
     });
   });
 });