fix(clear-button): updates documentation, examples and adds tests for clear button accessibility

[cdransf]

Description

Fixed accessibility violations in the <sp-clear-button> documentation by adding the required label attribute to all examples. The component implementation already correctly handles the label attribute (via the LikeAnchor mixin), but the documentation examples were missing it, causing WCAG 2.1 Level A violations (4.1.2 Name, Role, Value) when rendered on the documentation site.

Additionally:

• Corrected misleading documentation that suggested slot content could be used for labels (the ClearButton overrides buttonContent and does not render slot content)
• Fixed JSDoc in ClearButton.ts to accurately document the label attribute instead of the non-functional slot
• Added three new accessibility tests to verify aria-label behavior
• Fixed grammar: "only close icon" → "only a close icon"

Motivation and context

Users running Axe DevTools on https://swcpreviews.z13.web.core.windows.net/pr-5861/docs/components/clear-button reported "ARIA commands must have an accessible name" violations. The clear button examples were missing the label attribute, which is the only way to provide an accessible name since the component only renders an icon (no slot content).

Related issue(s)

• Reported via accessibility audit using Axe DevTools Chrome extension

Author's checklist

• I have read the CONTRIBUTING and PULL_REQUESTS documents.
• I have reviewed at the Accessibility Practices for this feature, see: Aria Practices
• I have added automated tests to cover my changes.
• I have included a well-written changeset if my change needs to be published.
• I have included updated documentation if my change required it.

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Reviewer's checklist

Manual review test cases

• Verify all clear-button examples on documentation page have accessible names

  1. Navigate to https://opensource.adobe.com/spectrum-web-components/components/clear-button/
  2. Run Axe DevTools browser extension
  3. Expect no "ARIA commands must have an accessible name" violations for clear buttons

• Verify clear button aria-label is set correctly

  1. Inspect any <sp-clear-button label="Clear"> element
  2. Check the rendered HTML attributes
  3. Expect role="button" and aria-label="Clear" on the host element

[changeset-bot]

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Latest commit: 19310ec

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[github-actions]

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🔍 Visual Regression Test Results

When a visual regression test fails (or has previously failed while working on this branch), its results can be found in the following URLs:

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• Express | Light | Medium | LTR
• Express | Dark | Large | RTL
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• High Contrast Mode | Medium | LTR

Deployed to Azure Blob Storage: pr-5861

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