wcag-aria-lookup

Research

Looks up WCAG 2.1 AA criteria and WAI-ARIA patterns, returning official W3C URLs with concise summaries. Use when user asks about accessibility standards, WCAG criteria (e.g., "1.4.3", "contrast"), ARIA attributes (e.g., "aria-expanded", "role=dialog"), or accessible component patterns (e.g., "accessible tabs", "modal dialog a11y").

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Source SKILL.md: https://github.com/majiayu000/claude-skill-registry/blob/HEAD/skills/data/wcag-aria-lookup/SKILL.md

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WCAG & ARIA Lookup

Quick lookup for WCAG 2.1 AA criteria and WAI-ARIA patterns with official W3C references.

Lookup Workflow

Identify the query type:
- WCAG criterion (e.g., "contrast", "1.4.3", "keyboard")
- ARIA attribute (e.g., "aria-expanded", "aria-live")
- ARIA role (e.g., "role=dialog", "role=tablist")
- Component pattern (e.g., "tabs", "modal", "accordion")
Search the appropriate index:
- For WCAG: Read wcag-index.json
- For ARIA: Read aria-index.json
Return results:
- Summary (1-2 sentences)
- Official W3C URL
- Quick reference URL (if available)
For detailed implementation:
- Suggest fetching the official URL
- Or reference WAI-ARIA Authoring Practices

Response Format

When returning lookup results, use this format:

### [Criterion/Pattern Name]

**Summary**: [1-2 sentence explanation]

**Key Requirements**:
- [Requirement 1]
- [Requirement 2]

**Official Reference**: [URL]
**Quick Reference**: [URL] (if applicable)

Quick Reference

WCAG 2.1 AA - Most Common Issues

ID	Name	Key Point
1.1.1	Non-text Content	All images need alt text
1.4.3	Contrast	4.5:1 normal, 3:1 large text
2.1.1	Keyboard	All interactive elements keyboard accessible
2.4.7	Focus Visible	Focus indicator must be visible
4.1.2	Name, Role, Value	Custom widgets need ARIA

ARIA - First Rule

Don't use ARIA if native HTML works.

<!-- Prefer native HTML -->
<button>Submit</button>           <!-- Not: <div role="button"> -->
<input type="checkbox">           <!-- Not: <div role="checkbox"> -->

Common ARIA Patterns

Pattern	Key Roles	Key Attributes
Dialog	`dialog`	`aria-modal`, `aria-labelledby`
Tabs	`tablist`, `tab`, `tabpanel`	`aria-selected`, `aria-controls`
Accordion	-	`aria-expanded`, `aria-controls`
Combobox	`combobox`, `listbox`, `option`	`aria-expanded`, `aria-activedescendant`
Menu	`menu`, `menuitem`	`aria-haspopup`, `aria-expanded`

Contrast Quick Check

Text Type	Minimum Ratio	Example
Normal text	4.5:1	`#595959` on `#fff` (7:1)
Large text (18pt/14pt bold)	3:1	`#767676` on `#fff` (4.5:1)
UI components	3:1	Button borders, form inputs