validating-accessibility

Testing & Quality

Validate UI components for WCAG 2.2 Level AA compliance. Use when checking accessibility, color contrast, keyboard navigation, screen reader support, or ARIA attributes.

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Source SKILL.md: https://github.com/majiayu000/claude-skill-registry/blob/HEAD/skills/data/validating-accessibility/SKILL.md

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Validating Accessibility

Ensure WCAG 2.2 Level AA compliance.

Quick Checklist

[ ] Color contrast: 4.5:1 (text), 3:1 (UI/large text)
[ ] Keyboard: All interactive elements focusable
[ ] Focus: Visible focus indicators
[ ] ARIA: Correct attributes on custom controls
[ ] Motion: prefers-reduced-motion respected
[ ] Semantic: Proper heading hierarchy (h1→h2→h3)
[ ] Labels: All form inputs have labels
[ ] Alt text: All images have alt attributes

Color Contrast

Normal text (<18px):     4.5:1 minimum
Large text (≥18px):      3:1 minimum
UI components:           3:1 minimum

/* Safe high-contrast pairs */
--text-on-light: oklch(15% 0 0);   /* ~16:1 on white */
--text-on-dark: oklch(95% 0 0);    /* ~14:1 on black */

Keyboard Navigation

// Visible focus indicator (MANDATORY)
className="focus:outline-none focus-visible:ring-2 focus-visible:ring-primary"

// Skip link (first element in body)
<a href="#main" className="sr-only focus:not-sr-only">
  Skip to main content
</a>

Semantic HTML

<!-- Correct heading hierarchy -->
<h1>Page Title</h1>
  <h2>Section</h2>
    <h3>Subsection</h3>

<!-- Landmarks -->
<header role="banner">
<nav role="navigation">
<main role="main" id="main">
<footer role="contentinfo">

ARIA Patterns

// Button with icon only
<button aria-label="Close dialog">
  <X className="h-4 w-4" />
</button>

// Expandable content
<button aria-expanded={isOpen} aria-controls="panel">
  Toggle
</button>
<div id="panel" aria-hidden={!isOpen}>Content</div>

// Form with description
<input aria-describedby="hint" />
<p id="hint">Must be 8+ characters</p>

Motion Accessibility

// Framer Motion with reduced motion
import { useReducedMotion } from "framer-motion";

function Component() {
  const shouldReduce = useReducedMotion();
  return (
    <motion.div
      animate={shouldReduce ? {} : { y: 0, opacity: 1 }}
    />
  );
}

/* CSS fallback */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    transition-duration: 0.01ms !important;
  }
}

References

UX Principles: ../../references/ux-principles.md (Nielsen heuristics, WCAG 2.2)
Forms Guide: ../../references/forms-guide.md (validation states, labels, error messages)
Buttons Guide: ../../references/buttons-guide.md (touch targets 44x44px, focus states)
Icons Guide: ../../references/icons-guide.md (aria-label for icon buttons)
Color System: ../../references/color-system.md (contrast ratios)
Design Patterns: ../../references/design-patterns.md
WCAG 2.2: https://www.w3.org/WAI/WCAG22/quickref/