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A11y audit

Skill badass-courses/a11y-agent/.claude/skills/a11y-audit

Accessibility expertise for AI coding agents.

Install
npx -y skills add badass-courses/a11y-agent --skill a11y-audit

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What its author says it does

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Structured accessibility assessment following a structured testing order. Asks targeted questions, walks through keyboard → tools → contrast → zoom → screen readers, produces prioritized report with WCAG references. Use when asked to "check accessibility", "audit a11y", "test accessibility", or before shipping UI.

SKILL.md

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Audit the current file, component, or page for accessibility issues. Focus on {{area}} if specified, otherwise check everything.

→ Consult the a11y-agent skill and its reference files for standards and patterns.

Context Gathering

Before starting a comprehensive audit, ask the user:

  1. What's the user flow? — Which pages/routes are involved? What's the critical path?
  2. What's the tech stack? — React/Vue/vanilla? Client-side routing? SSR/SSG?
  3. What's been tested before? — Any prior audit results? Known issues?
  4. Screen reader availability? — Mac (VoiceOver)? Windows (NVDA)?
  5. What's the target conformance level? — AA (default) or AAA?

Store answers for the session. Reference throughout the audit.

If the user asks for a quick audit, skip context gathering and note assumptions in the report.

Audit Process

Follow this order — each step builds on the previous:

1. Identify User Flow

What flow are you testing? Which pages? What are the critical components?

2. Keyboard Testing

Tab through each page. Every mouse-operable control must also be keyboard focusable and operable. Check for visible focus indicators, trapped focus, ghost tab stops (focusable but invisible elements).

3. Check Heading & Landmark Structure

Verify: one h1 per page, no skipped levels, all content in landmarks. Use the document outline as a proxy for screen reader navigation.

4. Automated Scan

Run axe-core (or suggest the user run axe DevTools). Scan with menus/modals open — axe only tests rendered content. Note: automated tools catch only 30-50% of issues.

5. Color Contrast

Check suspect combinations. Regular text < 24px needs 4.5:1. Large text ≥ 24px (or ≥ 19px bold) needs 3:1. Non-text elements (borders, icons) need 3:1. Text inside UI components still needs text-level ratios.

6. Zoom & Reflow

Zoom to 200% minimum. Check responsive breakpoints. No horizontal scrolling at 320px CSS width. Test on actual devices if possible.

7. Screen Reader Testing

Test with VoiceOver + Safari (Mac) and NVDA + Chrome (Windows) if available. Check: headings announced, landmarks navigable, forms labeled, dynamic content announced, focus management works.

Categories to Check

Structure

  • Missing or skipped heading levels
  • Content not wrapped in landmarks
  • Non-semantic elements used for interactive controls (div/span instead of button/a)
  • Missing <html lang>
  • Missing viewport meta tag

Keyboard

  • Interactive elements not focusable (div with onClick, a without href)
  • Focus outlines removed or invisible
  • No Escape key support for modals/menus
  • Hidden content still in tab order
  • Missing skip link
  • Composite widgets without roving tabindex

ARIA

  • ARIA roles on wrong elements
  • Missing accessible names on interactive elements
  • aria-hidden="true" on focusable elements without tabindex="-1"
  • Missing aria-expanded on toggles
  • Missing aria-current in navigation
  • Live regions appended dynamically instead of present at load

Forms

  • Inputs without associated labels
  • Placeholder used as only label
  • Missing aria-required on required fields
  • No aria-invalid or aria-describedby for errors
  • Form errors not announced via live region

Images & Media

  • Images missing alt text
  • Decorative images with non-empty alt
  • SVGs without role="img" and aria-label
  • Video with autoplay
  • Missing captions/transcripts

Contrast & Color

  • Text colors that likely fail 4.5:1 ratio
  • Color used as sole indicator (errors, status, required)
  • Low contrast on interactive element borders

Motion

  • Animations without prefers-reduced-motion support
  • Auto-playing content without pause controls
  • Flashing content

Responsive

  • Fixed widths that prevent reflow
  • Missing viewport meta tag
  • Content that would require horizontal scroll at 320px

Report Format

Produce a structured report:

Critical (WCAG A violations) — blocks access for some users

  • [Issue] → [Fix] → [WCAG criterion]

Serious (WCAG AA violations) — significant barriers

  • [Issue] → [Fix] → [WCAG criterion]

Moderate (WCAG AAA / Best practices) — quality improvements

  • [Issue] → [Fix]

CRITICAL: This is an audit, not a fix. Document issues with clear explanations. Use /a11y-fix to implement fixes.

Storing Results

After producing the report, offer to save it to a11y-audit-results/YYYY-MM-DD-<area>.md in the project. If previous results exist, note what improved and what regressed.

Keep looking

Skills are one crate of 328,083. Ordering is by how many stacks a row turns up in, so the top of any crate is what has actually been picked rather than what has the most stars.