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accessibility-check

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Updated 10-16 04:55

About this skill

Accessibility Check

Scan any web page for WCAG accessibility violations. No signup required.

Prerequisites

  • Playwright MCP (comes with Claude Code)

Trigger

  • "Check accessibility on https://..."
  • "WCAG scan this page"
  • "Is my site accessible?"

Workflow

  1. Navigate to the URL using mcp__playwright__browser_navigate
  2. Take a snapshot with mcp__playwright__browser_snapshot
  3. Check each of these categories:

Checks

Images & Media

  • Every img must have alt attribute
  • Decorative images should have alt=""
  • video and audio should have captions/transcripts

Headings

  • Page should have exactly one h1
  • Headings should not skip levels (h1 → h3 without h2)
  • Headings should be descriptive, not empty

Forms

  • Every input must have a visible label or aria-label
  • Required fields should be marked
  • Error messages should be associated with fields

Keyboard

  • All interactive elements should be focusable
  • Tab order should be logical
  • No keyboard traps (can tab in and out of everything)
  • Focus indicator must be visible

Color & Contrast

  • Text should have 4.5:1 contrast ratio (AA)
  • Large text (18px+) needs 3:1 minimum
  • Information should not rely on color alone

ARIA

  • Interactive elements should have accessible names
  • role attributes should be valid
  • aria-hidden="true" should not hide focusable elements

Structure

  • Page should have landmark regions (main, nav, header, footer)
  • Links should have descriptive text (not "click here")
  • Language attribute on <html>

  1. Grade the page: A (0-1 issues), B (2-4), C (5-8), D (9-12), F (13+)

  2. Output:

## Accessibility Report: [URL]

**Grade: B** (3 issues found)

### Issues
1. [CRITICAL] 2 images missing alt text
   - img at hero section (src: banner.jpg)
   - img in footer (src: logo.png)

2. [WARNING] Heading hierarchy skips h2
   - h1 "Welcome" → h3 "Features" (missing h2)

3. [WARNING] 1 form input without label
   - Search input in header has placeholder but no label

### Passed
- Color contrast: OK
- Keyboard navigation: OK
- ARIA landmarks: OK
- Language attribute: OK

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