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a11y-audit

Skill0 starsChanged 3 months agoMITView on GitHub

Audit frontend code for WCAG 2.1 AA accessibility compliance including semantic HTML, ARIA, keyboard navigation, and color contrast.

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SKILL.md

Accessibility Audit (WCAG 2.1 AA)

Audit Checklist

1. Semantic HTML

Scan for:

  • <div> or <span> used where semantic elements should be (<nav>, <main>, <article>, <section>, <header>, <footer>, <aside>, <button>, <a>)
  • Click handlers on non-interactive elements (<div onClick> instead of <button>)
  • Missing <label> elements for form inputs
  • Missing <h1>-<h6> hierarchy (skipped heading levels)
  • Tables without <th>, <caption>, or scope attributes

2. ARIA Attributes

Scan for:

  • Interactive elements missing aria-label or visible text
  • Custom widgets missing appropriate ARIA roles
  • Dynamic content missing aria-live regions
  • Modal/dialog missing aria-modal and focus trap
  • Toggle controls missing aria-expanded or aria-pressed
  • Images missing alt text (or decorative images missing alt="")

3. Keyboard Navigation

Check for:

  • Elements with onClick but no onKeyDown/onKeyUp
  • tabIndex greater than 0 (disrupts natural tab order)
  • Missing focus styles (:focus-visible CSS)
  • Focus traps in modals/dialogs
  • Skip navigation link at page top

4. Color Contrast

Check for:

  • Text colors against background colors meeting 4.5:1 ratio (normal text)
  • Large text meeting 3:1 ratio
  • Non-text elements (icons, borders) meeting 3:1 ratio
  • Information conveyed only through color (needs shape/text alternative)

5. Motion and Media

Check for:

  • Animations without prefers-reduced-motion media query
  • Auto-playing media without pause controls
  • Flashing content (3 flashes per second limit)

Automated Scan

If available, run:

npx axe-cli http://localhost:3000 --exit 2>/dev/null || echo "axe-cli not available — manual review only"

Report Format

For each issue found:

**Severity**: Critical / Major / Minor
**Rule**: WCAG success criterion (e.g., 1.1.1 Non-text Content)
**Location**: file:line
**Problem**: What's wrong
**Fix**: Exact code change needed

Severity Guide

  • Critical: Prevents access entirely (missing alt text, no keyboard access, no labels)
  • Major: Significantly impairs experience (poor contrast, missing ARIA, broken focus)
  • Minor: Suboptimal but functional (heading hierarchy, decorative images)

Summary

ACCESSIBILITY: [PASS | ISSUES FOUND]

Critical: X issues (blocks deployment)
Major: X issues (should fix before release)
Minor: X issues (improve when convenient)

Top 3 fixes for maximum impact:
1. [fix]
2. [fix]
3. [fix]

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