Skill: Accessibility Audit

Overview

This skill performs a comprehensive WCAG 2.1 AA accessibility audit, testing:

• Screen reader compatibility (NVDA, JAWS, VoiceOver)
• Keyboard navigation
• Color contrast ratios
• ARIA attribute correctness
• Semantic HTML structure
• Form accessibility

Purpose

Ensure WCAG 2.1 AA compliance before release. This skill should be used:

• After UI implementation is complete
• Before user acceptance testing
• When accessibility issues are reported
• As part of Phase 7e (Code Review)

Execution Flow

1. RUN automated tests (axe-core)
2. MANUAL keyboard navigation test
3. SCREEN reader testing (NVDA/VoiceOver)
4. CHECK color contrast ratios
5. VALIDATE ARIA attributes
6. TEST form accessibility
7. VERIFY focus management
8. GENERATE compliance report
9. PROVIDE remediation guidance

Input Parameters

Parameter	Type	Description	Required
url	string	URL to audit	Yes
wcagLevel	string	Target WCAG level (AA default)	No
includeScreenReader	boolean	Include screen reader tests	No
pages	string[]	Specific pages to audit	No

Output Format

# Accessibility Audit Report

**Date:** [timestamp]
**URL:** [audited URL]
**WCAG Level:** AA
**Auditor:** Accessibility Expert Agent

## Compliance Summary

| Category | Tests | Passed | Failed | Compliance |
|----------|-------|--------|--------|------------|
| Perceivable | 15 | 14 | 1 | 93% |
| Operable | 12 | 12 | 0 | 100% |
| Understandable | 8 | 7 | 1 | 88% |
| Robust | 5 | 5 | 0 | 100% |
| **Total** | **40** | **38** | **2** | **95%** |

## Critical Violations (Block Release)

### 1. Color Contrast Insufficient
- **WCAG:** 1.4.3 Contrast (Minimum)
- **Impact:** Critical
- **Location:** .btn-primary
- **Current:** #888888 on #FFFFFF (3.5:1)
- **Required:** 4.5:1 minimum
- **Fix:** Change text to #616161 or darker
- **Code:**
  ```css
  .btn-primary {
      color: #616161; /* 5.1:1 contrast */
  }

Serious Violations (Fix Before Merge)

[Same format]

Moderate Violations

[Same format]

Manual Testing Results

Keyboard Navigation

Test	Result	Notes
Tab order logical	Pass	Sequential through form
Focus visible	Pass	Blue outline present
Skip link works	Pass	Jumps to main content
Modal focus trap	Pass	Focus stays in modal
Escape closes modal	Pass	Works correctly

Screen Reader Testing (NVDA)

Element	Result	Announced As
Main navigation	Pass	"Navigation landmark"
Search input	Pass	"Search, edit, blank"
Submit button	Pass	"Submit, button"
Error message	Fail	Not announced
Success toast	Pass	"Success, alert"

Remediation Roadmap

Immediate (Critical)

1. Fix button color contrast
2. Add aria-live to error messages

Short-term (Serious)

1. Add form field descriptions
2. Fix heading hierarchy

Medium-term (Moderate)

1. Add skip links
2. Improve focus indicators

Files to Modify

File	Changes Needed
styles/buttons.css	Update color values
components/Form.tsx	Add aria-describedby
components/Error.tsx	Add aria-live

Testing Commands

# Run axe-core
npx axe-cli [url] --tags wcag2aa

# Validate HTML
npx html-validate [url]

# Check contrast
npx color-contrast-checker --ratio 4.5

## Example Usage

### Example 1: Audit Login Page

USER: /accessibility-audit https://example.com/login

SKILL OUTPUT:

Accessibility Audit Report

Date: 2026-02-17T12:00:00Z URL: https://example.com/login WCAG Level: AA Auditor: Accessibility Expert Agent

Compliance Summary

Category	Tests	Passed	Failed	Compliance
Perceivable	12	10	2	83%
Operable	10	9	1	90%
Understandable	6	5	1	83%
Robust	4	4	0	100%
Total	32	28	4	88%

Critical Violations

1. Form Field Missing Label

• WCAG: 1.3.1 Info and Relationships
• Impact: Critical
• Location: #email-input
• Problem: Input has no associated label
• Fix: Add label element or aria-label
• Code:

  <label for="email">Email Address</label>
  <input type="email" id="email" name="email" />
  

2. Insufficient Color Contrast

• WCAG: 1.4.3 Contrast (Minimum)
• Impact: Critical
• Location: .forgot-password-link
• Current: #aaaaaa on #ffffff (2.9:1)
• Required: 4.5:1
• Fix: Darken to #767676 or darker

### Example 2: Quick Contrast Check

USER: Check color contrast for primary button

SKILL INPUT: { "foreground": "#3b82f6", "background": "#ffffff" }

SKILL OUTPUT:

Color Contrast Analysis

Combination	Ratio	AA Text	AA Large	AAA Text
#3b82f6 on #ffffff	3.9:1	❌ Fail	✅ Pass	❌ Fail

Recommendation: For normal text, use #2563eb (4.5:1) or darker.

/* Current */
.btn-primary {
    background: #3b82f6;
}

/* Recommended */
.btn-primary {
    background: #2563eb; /* WCAG AA compliant for text */
}

## WCAG 2.1 AA Quick Reference

| Criterion | Requirement | Test |
|-----------|-------------|------|
| 1.1.1 | Alt text for images | Check img tags |
| 1.3.1 | Semantic structure | Check headings, lists |
| 1.4.3 | 4.5:1 contrast (text) | Contrast checker |
| 1.4.11 | 3:1 contrast (UI) | Contrast checker |
| 2.1.1 | Keyboard accessible | Tab through page |
| 2.4.1 | Skip navigation | Test skip link |
| 2.4.7 | Visible focus | Tab and observe |
| 4.1.2 | ARIA correct | axe-core scan |

## Tools Used

| Tool | Purpose |
|------|---------|
| axe-core | Automated testing |
| WAVE | Visual feedback |
| NVDA | Screen reader testing |
| Keyboard | Manual navigation |
| Contrast Checker | Color validation |

## Integration

This skill integrates with:
- **ui-review**: Combined with visual review
- **accessibility-expert-agent**: For remediation guidance
- **frontend-developer**: For implementation fixes