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a11y-audit

Use when auditing accessibility compliance of a feature or codebase. Covers WCAG 2.2 AA conformance, screen reader compatibility, keyboard navigation, focus management, color contrast, reduced motion, and ARIA usage. Do not use for general UX review (use journey-mapping) or component interaction specs (use interaction-design).

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概要

インストールコマンド

npx skills add https://github.com/dtsong/my-claude-setup --skill a11y-audit

このコマンドをClaude Codeにコピー＆ペーストしてスキルをインストール

ソース

dtsong/my-claude-setup

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更新日2026年3月26日 08:42

SKILL.md

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name	a11y-audit
department	advocate
description	Use when auditing accessibility compliance of a feature or codebase. Covers WCAG 2.2 AA conformance, screen reader compatibility, keyboard navigation, focus management, color contrast, reduced motion, and ARIA usage. Do not use for general UX review (use journey-mapping) or component interaction specs (use interaction-design).
version	1
triggers	["accessibility","a11y","WCAG","screen reader","ARIA","keyboard navigation","focus management","color contrast","reduced motion"]

A11y Audit

Purpose

Evaluate accessibility compliance against WCAG 2.2 AA criteria across perceivable, operable, understandable, and robust principles. Identify barriers for users of assistive technologies and provide actionable remediation steps.

Scope Constraints

Reads source code, templates, styles, and component markup for accessibility analysis. Does not modify files or execute code. Does not perform automated accessibility scans (recommend tooling where appropriate).

Inputs

Feature description or codebase path to audit
Target WCAG conformance level (default: AA)
Known assistive technologies in scope (screen readers, switch devices, etc.)
Any existing accessibility testing results or known issues

Input Sanitization

No user-provided values are used in commands or file paths. All inputs are treated as read-only analysis targets.

Procedure

Progress Checklist

Step 1: Audit keyboard navigation and focus management
Step 2: Evaluate screen reader compatibility
Step 3: Check color contrast and visual accessibility
Step 4: Review ARIA usage and semantic markup
Step 5: Assess motion and animation accessibility
Step 6: Verify form and error handling accessibility

Step 1: Audit Keyboard Navigation and Focus Management

Verify all interactive elements are reachable via Tab/Shift+Tab.
Check focus order matches visual reading order.
Confirm visible focus indicators on all interactive elements (:focus-visible).
Verify focus trapping in modals, dialogs, and drawers.
Check skip-link presence for bypassing repetitive navigation.
Confirm no keyboard traps (user can always Tab out of any component).

Step 2: Evaluate Screen Reader Compatibility

Verify heading hierarchy (h1-h6) is logical and unbroken.
Check all images have meaningful alt text or alt="" for decorative.
Confirm form inputs have associated <label> elements or aria-label.
Verify live regions (aria-live) for dynamic content updates.
Check landmark regions (<nav>, <main>, <aside>, <header>, <footer>).
Confirm status messages use role="status" or role="alert".

Step 3: Check Color Contrast and Visual Accessibility

Verify text contrast meets 4.5:1 for normal text, 3:1 for large text (WCAG 1.4.3).
Check non-text contrast for UI components and graphical objects at 3:1 (WCAG 1.4.11).
Confirm information is not conveyed by color alone.
Verify content remains readable at 200% zoom.
Check text spacing adjustment tolerance (WCAG 1.4.12).

Step 4: Review ARIA Usage and Semantic Markup

Verify ARIA roles match element behavior (no role="button" on non-interactive elements without keyboard handlers).
Check for redundant ARIA on native semantic elements.
Confirm aria-expanded, aria-selected, aria-checked states update correctly.
Verify custom widgets follow WAI-ARIA Authoring Practices patterns.
Check aria-describedby and aria-labelledby reference valid IDs.

Step 5: Assess Motion and Animation Accessibility

Check prefers-reduced-motion media query support.
Verify no content relies solely on animation to convey meaning.
Confirm auto-playing content can be paused, stopped, or hidden (WCAG 2.2.2).
Check parallax and scrolling effects respect reduced motion preference.

Step 6: Verify Form and Error Handling Accessibility

Confirm error messages are programmatically associated with inputs (aria-describedby).
Verify inline validation announces errors to screen readers.
Check required fields are indicated both visually and programmatically (aria-required).
Confirm form submission errors provide clear recovery instructions.
Verify autocomplete attributes on identity/payment fields (WCAG 1.3.5).

Compaction resilience: If context was lost, re-read the Inputs section to identify the audit target, check the Progress Checklist for completed steps, then resume from the earliest incomplete step.

Output Format

Category	WCAG Criterion	Finding	Severity	Recommendation
Keyboard	2.1.1 Keyboard	...	Critical/High/Med/Low	...
Screen reader	1.3.1 Info and Relationships	...	...	...
Color contrast	1.4.3 Contrast (Minimum)	...	...	...
ARIA	4.1.2 Name, Role, Value	...	...	...
Motion	2.3.1 Three Flashes	...	...	...
Forms	3.3.1 Error Identification	...	...	...

Handoff

Hand off to interaction-design if component-level state changes are needed for accessibility remediation.
Hand off to artisan/visual-audit if contrast or visual design changes require design system updates.

Quality Checks

All interactive elements verified for keyboard accessibility
Focus management audited for modals, dialogs, and dynamic content
Screen reader heading hierarchy and landmark structure validated
Color contrast ratios verified against WCAG 2.2 AA thresholds
ARIA usage follows WAI-ARIA Authoring Practices
Reduced motion preferences checked
Form error handling is accessible
Each finding references a specific WCAG success criterion

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ソース

dtsong

dtsong/my-claude-setup

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