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feat: add 5 new specialized agents with 20 skills
Add domain expert agents with comprehensive skill sets: - service-mesh-expert (cloud-infrastructure): Istio/Linkerd patterns, mTLS, observability - event-sourcing-architect (backend-development): CQRS, event stores, projections, sagas - vector-database-engineer (llm-application-dev): embeddings, similarity search, hybrid search - monorepo-architect (developer-essentials): Nx, Turborepo, Bazel, pnpm workspaces - threat-modeling-expert (security-scanning): STRIDE, attack trees, security requirements Update all documentation to reflect correct counts: - 67 plugins, 99 agents, 107 skills, 71 commands
This commit is contained in:
Seth Hobson
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---
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name: wcag-audit-patterns
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description: Conduct WCAG 2.2 accessibility audits with automated testing, manual verification, and remediation guidance. Use when auditing websites for accessibility, fixing WCAG violations, or implementing accessible design patterns.
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---
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# WCAG Audit Patterns
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Comprehensive guide to auditing web content against WCAG 2.2 guidelines with actionable remediation strategies.
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## When to Use This Skill
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- Conducting accessibility audits
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- Fixing WCAG violations
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- Implementing accessible components
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- Preparing for accessibility lawsuits
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- Meeting ADA/Section 508 requirements
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- Achieving VPAT compliance
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## Core Concepts
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### 1. WCAG Conformance Levels
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| Level | Description | Required For |
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|-------|-------------|--------------|
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| **A** | Minimum accessibility | Legal baseline |
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| **AA** | Standard conformance | Most regulations |
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| **AAA** | Enhanced accessibility | Specialized needs |
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### 2. POUR Principles
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```
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Perceivable: Can users perceive the content?
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Operable: Can users operate the interface?
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Understandable: Can users understand the content?
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Robust: Does it work with assistive tech?
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```
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### 3. Common Violations by Impact
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```
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Critical (Blockers):
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├── Missing alt text for functional images
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├── No keyboard access to interactive elements
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├── Missing form labels
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└── Auto-playing media without controls
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Serious:
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├── Insufficient color contrast
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├── Missing skip links
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├── Inaccessible custom widgets
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└── Missing page titles
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Moderate:
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├── Missing language attribute
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├── Unclear link text
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├── Missing landmarks
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└── Improper heading hierarchy
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```
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## Audit Checklist
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### Perceivable (Principle 1)
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```markdown
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## 1.1 Text Alternatives
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### 1.1.1 Non-text Content (Level A)
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- [ ] All images have alt text
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- [ ] Decorative images have alt=""
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- [ ] Complex images have long descriptions
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- [ ] Icons with meaning have accessible names
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- [ ] CAPTCHAs have alternatives
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Check:
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```html
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<!-- Good -->
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<img src="chart.png" alt="Sales increased 25% from Q1 to Q2">
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<img src="decorative-line.png" alt="">
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<!-- Bad -->
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<img src="chart.png">
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<img src="decorative-line.png" alt="decorative line">
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```
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## 1.2 Time-based Media
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### 1.2.1 Audio-only and Video-only (Level A)
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- [ ] Audio has text transcript
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- [ ] Video has audio description or transcript
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### 1.2.2 Captions (Level A)
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- [ ] All video has synchronized captions
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- [ ] Captions are accurate and complete
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- [ ] Speaker identification included
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### 1.2.3 Audio Description (Level A)
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- [ ] Video has audio description for visual content
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## 1.3 Adaptable
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### 1.3.1 Info and Relationships (Level A)
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- [ ] Headings use proper tags (h1-h6)
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- [ ] Lists use ul/ol/dl
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- [ ] Tables have headers
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- [ ] Form inputs have labels
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- [ ] ARIA landmarks present
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Check:
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```html
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<!-- Heading hierarchy -->
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<h1>Page Title</h1>
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<h2>Section</h2>
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<h3>Subsection</h3>
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<h2>Another Section</h2>
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<!-- Table headers -->
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<table>
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<thead>
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<tr><th scope="col">Name</th><th scope="col">Price</th></tr>
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</thead>
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</table>
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```
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### 1.3.2 Meaningful Sequence (Level A)
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- [ ] Reading order is logical
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- [ ] CSS positioning doesn't break order
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- [ ] Focus order matches visual order
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### 1.3.3 Sensory Characteristics (Level A)
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- [ ] Instructions don't rely on shape/color alone
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- [ ] "Click the red button" → "Click Submit (red button)"
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## 1.4 Distinguishable
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### 1.4.1 Use of Color (Level A)
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- [ ] Color is not only means of conveying info
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- [ ] Links distinguishable without color
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- [ ] Error states not color-only
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### 1.4.3 Contrast (Minimum) (Level AA)
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- [ ] Text: 4.5:1 contrast ratio
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- [ ] Large text (18pt+): 3:1 ratio
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- [ ] UI components: 3:1 ratio
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Tools: WebAIM Contrast Checker, axe DevTools
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### 1.4.4 Resize Text (Level AA)
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- [ ] Text resizes to 200% without loss
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- [ ] No horizontal scrolling at 320px
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- [ ] Content reflows properly
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### 1.4.10 Reflow (Level AA)
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- [ ] Content reflows at 400% zoom
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- [ ] No two-dimensional scrolling
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- [ ] All content accessible at 320px width
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### 1.4.11 Non-text Contrast (Level AA)
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- [ ] UI components have 3:1 contrast
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- [ ] Focus indicators visible
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- [ ] Graphical objects distinguishable
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### 1.4.12 Text Spacing (Level AA)
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- [ ] No content loss with increased spacing
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- [ ] Line height 1.5x font size
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- [ ] Paragraph spacing 2x font size
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- [ ] Letter spacing 0.12x font size
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- [ ] Word spacing 0.16x font size
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```
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### Operable (Principle 2)
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```markdown
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## 2.1 Keyboard Accessible
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### 2.1.1 Keyboard (Level A)
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- [ ] All functionality keyboard accessible
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- [ ] No keyboard traps
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- [ ] Tab order is logical
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- [ ] Custom widgets are keyboard operable
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Check:
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```javascript
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// Custom button must be keyboard accessible
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<div role="button" tabindex="0"
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onkeydown="if(event.key === 'Enter' || event.key === ' ') activate()">
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```
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### 2.1.2 No Keyboard Trap (Level A)
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- [ ] Focus can move away from all components
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- [ ] Modal dialogs trap focus correctly
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- [ ] Focus returns after modal closes
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## 2.2 Enough Time
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### 2.2.1 Timing Adjustable (Level A)
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- [ ] Session timeouts can be extended
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- [ ] User warned before timeout
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- [ ] Option to disable auto-refresh
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### 2.2.2 Pause, Stop, Hide (Level A)
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- [ ] Moving content can be paused
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- [ ] Auto-updating content can be paused
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- [ ] Animations respect prefers-reduced-motion
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```css
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@media (prefers-reduced-motion: reduce) {
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* {
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animation: none !important;
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transition: none !important;
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}
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}
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```
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## 2.3 Seizures and Physical Reactions
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### 2.3.1 Three Flashes (Level A)
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- [ ] No content flashes more than 3 times/second
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- [ ] Flashing area is small (<25% viewport)
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## 2.4 Navigable
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### 2.4.1 Bypass Blocks (Level A)
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- [ ] Skip to main content link present
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- [ ] Landmark regions defined
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- [ ] Proper heading structure
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```html
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<a href="#main" class="skip-link">Skip to main content</a>
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<main id="main">...</main>
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```
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### 2.4.2 Page Titled (Level A)
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- [ ] Unique, descriptive page titles
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- [ ] Title reflects page content
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### 2.4.3 Focus Order (Level A)
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- [ ] Focus order matches visual order
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- [ ] tabindex used correctly
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### 2.4.4 Link Purpose (In Context) (Level A)
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- [ ] Links make sense out of context
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- [ ] No "click here" or "read more" alone
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```html
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<!-- Bad -->
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<a href="report.pdf">Click here</a>
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<!-- Good -->
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<a href="report.pdf">Download Q4 Sales Report (PDF)</a>
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```
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### 2.4.6 Headings and Labels (Level AA)
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- [ ] Headings describe content
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- [ ] Labels describe purpose
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### 2.4.7 Focus Visible (Level AA)
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- [ ] Focus indicator visible on all elements
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- [ ] Custom focus styles meet contrast
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```css
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:focus {
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outline: 3px solid #005fcc;
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outline-offset: 2px;
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}
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```
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### 2.4.11 Focus Not Obscured (Level AA) - WCAG 2.2
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- [ ] Focused element not fully hidden
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- [ ] Sticky headers don't obscure focus
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```
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### Understandable (Principle 3)
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```markdown
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## 3.1 Readable
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### 3.1.1 Language of Page (Level A)
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- [ ] HTML lang attribute set
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- [ ] Language correct for content
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```html
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<html lang="en">
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```
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### 3.1.2 Language of Parts (Level AA)
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- [ ] Language changes marked
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```html
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<p>The French word <span lang="fr">bonjour</span> means hello.</p>
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```
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## 3.2 Predictable
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### 3.2.1 On Focus (Level A)
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- [ ] No context change on focus alone
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- [ ] No unexpected popups on focus
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### 3.2.2 On Input (Level A)
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- [ ] No automatic form submission
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- [ ] User warned before context change
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### 3.2.3 Consistent Navigation (Level AA)
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- [ ] Navigation consistent across pages
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- [ ] Repeated components same order
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### 3.2.4 Consistent Identification (Level AA)
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- [ ] Same functionality = same label
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- [ ] Icons used consistently
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## 3.3 Input Assistance
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### 3.3.1 Error Identification (Level A)
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- [ ] Errors clearly identified
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- [ ] Error message describes problem
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- [ ] Error linked to field
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```html
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<input aria-describedby="email-error" aria-invalid="true">
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<span id="email-error" role="alert">Please enter valid email</span>
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```
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### 3.3.2 Labels or Instructions (Level A)
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- [ ] All inputs have visible labels
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- [ ] Required fields indicated
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- [ ] Format hints provided
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### 3.3.3 Error Suggestion (Level AA)
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- [ ] Errors include correction suggestion
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- [ ] Suggestions are specific
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### 3.3.4 Error Prevention (Level AA)
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- [ ] Legal/financial forms reversible
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- [ ] Data checked before submission
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- [ ] User can review before submit
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```
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### Robust (Principle 4)
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```markdown
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## 4.1 Compatible
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### 4.1.1 Parsing (Level A) - Obsolete in WCAG 2.2
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- [ ] Valid HTML (good practice)
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- [ ] No duplicate IDs
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- [ ] Complete start/end tags
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### 4.1.2 Name, Role, Value (Level A)
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- [ ] Custom widgets have accessible names
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- [ ] ARIA roles correct
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- [ ] State changes announced
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```html
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<!-- Accessible custom checkbox -->
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<div role="checkbox"
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aria-checked="false"
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tabindex="0"
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aria-labelledby="label">
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</div>
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<span id="label">Accept terms</span>
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```
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### 4.1.3 Status Messages (Level AA)
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- [ ] Status updates announced
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- [ ] Live regions used correctly
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```html
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<div role="status" aria-live="polite">
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3 items added to cart
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</div>
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<div role="alert" aria-live="assertive">
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Error: Form submission failed
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</div>
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```
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```
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## Automated Testing
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```javascript
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// axe-core integration
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const axe = require('axe-core');
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async function runAccessibilityAudit(page) {
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await page.addScriptTag({ path: require.resolve('axe-core') });
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const results = await page.evaluate(async () => {
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return await axe.run(document, {
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runOnly: {
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type: 'tag',
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values: ['wcag2a', 'wcag2aa', 'wcag21aa', 'wcag22aa']
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}
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});
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});
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return {
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violations: results.violations,
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passes: results.passes,
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incomplete: results.incomplete
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};
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}
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// Playwright test example
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test('should have no accessibility violations', async ({ page }) => {
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await page.goto('/');
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const results = await runAccessibilityAudit(page);
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expect(results.violations).toHaveLength(0);
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});
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```
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```bash
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# CLI tools
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npx @axe-core/cli https://example.com
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npx pa11y https://example.com
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lighthouse https://example.com --only-categories=accessibility
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```
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## Remediation Patterns
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### Fix: Missing Form Labels
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```html
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<!-- Before -->
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<input type="email" placeholder="Email">
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<!-- After: Option 1 - Visible label -->
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<label for="email">Email address</label>
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<input id="email" type="email">
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<!-- After: Option 2 - aria-label -->
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<input type="email" aria-label="Email address">
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<!-- After: Option 3 - aria-labelledby -->
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<span id="email-label">Email</span>
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<input type="email" aria-labelledby="email-label">
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```
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### Fix: Insufficient Color Contrast
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```css
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/* Before: 2.5:1 contrast */
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.text { color: #767676; }
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/* After: 4.5:1 contrast */
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.text { color: #595959; }
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/* Or add background */
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.text {
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color: #767676;
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background: #000;
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}
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```
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### Fix: Keyboard Navigation
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```javascript
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// Make custom element keyboard accessible
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class AccessibleDropdown extends HTMLElement {
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connectedCallback() {
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this.setAttribute('tabindex', '0');
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this.setAttribute('role', 'combobox');
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this.setAttribute('aria-expanded', 'false');
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this.addEventListener('keydown', (e) => {
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switch (e.key) {
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case 'Enter':
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case ' ':
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this.toggle();
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e.preventDefault();
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break;
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case 'Escape':
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this.close();
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break;
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case 'ArrowDown':
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this.focusNext();
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e.preventDefault();
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break;
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case 'ArrowUp':
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this.focusPrevious();
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e.preventDefault();
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break;
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}
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});
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}
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}
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```
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## Best Practices
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### Do's
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- **Start early** - Accessibility from design phase
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- **Test with real users** - Disabled users provide best feedback
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- **Automate what you can** - 30-50% issues detectable
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- **Use semantic HTML** - Reduces ARIA needs
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- **Document patterns** - Build accessible component library
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### Don'ts
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- **Don't rely only on automated testing** - Manual testing required
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- **Don't use ARIA as first solution** - Native HTML first
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- **Don't hide focus outlines** - Keyboard users need them
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- **Don't disable zoom** - Users need to resize
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- **Don't use color alone** - Multiple indicators needed
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## Resources
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- [WCAG 2.2 Guidelines](https://www.w3.org/TR/WCAG22/)
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- [WebAIM](https://webaim.org/)
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- [A11y Project Checklist](https://www.a11yproject.com/checklist/)
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- [axe DevTools](https://www.deque.com/axe/)
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Reference in New Issue
Block a user