Agent Skills: wcag-audit-operable-keyboard-focus

When to Use

Use this tool when designing keyboard navigation flows, testing tab order, or ensuring logical focus progression through interactive elements.

Usage

Command Line

node scripts/validate.js --elements "header, nav, main, button, button, footer"
node scripts/validate.js --tab-order "1,2,3,4,5" --expected "1,2,3,4,5"
node scripts/validate.js --json '{"elements": ["header", "nav", "main", "button#submit"], "tabOrder": [1,2,3,4]}'

JSON Input

node scripts/validate.js --json '{
  "elements": ["header", "nav", "button#menu", "main", "button#submit", "footer"],
  "tabOrder": [1, 2, 3, 4, 5, 6],
  "expectedOrder": [1, 2, 4, 5, 3, 6]
}'

Parameters

• --elements: Comma-separated list of element identifiers
• --tab-order: Comma-separated list of tab order indices
• --expected: Expected logical order (optional)
• --json: JSON input with elements and tab order properties

Output

Returns JSON with validation results and issues:

{
  "elements": ["header", "nav", "main", "button", "footer"],
  "tabOrder": [1, 2, 3, 4, 5],
  "validation": {
    "logical": true,
    "complete": true,
    "issues": []
  },
  "recommendations": [
    "Consider moving primary action button before secondary navigation"
  ]
}

Examples

Validate simple tab order

$ node scripts/validate.js --elements "header, nav, main, button, footer" --tab-order "1,2,3,4,5"
✅ Logical order: PASS
✅ Complete coverage: PASS
✅ No focus traps: PASS
Focus order follows logical reading sequence

Detect focus order issues

$ node scripts/validate.js --elements "header, nav, button, main, footer" --tab-order "1,2,4,3,5"
❌ Logical order: FAIL
⚠️  Tab order issue: "main" (position 3) appears before "button" (position 4)
Recommendations:
- Move main content before secondary buttons
- Consider semantic HTML structure for better default tab order

WCAG Standards

• Logical Order: Focus order should follow logical reading sequence
• No Traps: Users should not get trapped in focus loops
• Complete Coverage: All interactive elements should be keyboard accessible
• Skip Links: Provide mechanisms to skip repeated navigation sections
• Modal Focus: Modal dialogs should manage focus appropriately

Best Practices

1. Follow reading order: Tab order should match visual reading sequence
2. Use semantic HTML: Proper heading hierarchy and landmarks improve default tab order
3. Provide skip links: Allow users to skip navigation sections
4. Test with keyboard: Verify all interactions work without mouse
5. Avoid focus traps: Ensure users can always move forward and backward

Focus Order Patterns

Good Order:

1. Header/Skip links
2. Main navigation
3. Main content
4. Footer links
5. Footer

Problematic Order:

1. Header
2. Footer links
3. Main navigation
4. Main content

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