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accessibility-audit

WCAG 2.2 Level AA accessibility audit for web applications. Checks perceivable (alt text, color contrast, captions), operable (keyboard navigation, focus management, WCAG 2.2 new criteria), understandable (labels, error messages), and robust (ARIA, screen reader compatibility). Produces violation table with WCAG criterion IDs and remediation. Triggers: accessibility audit, WCAG, a11y, screen reader, keyboard navigation, color contrast, ARIA audit, 無障礙, 可及性.

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更新日2026年3月24日 01:44

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Roger-235

Roger-235/my_skill_repo

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役立つ用途SOC

ウェブ開発者コンピュータ・数学職15-1254L4

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2 ファイル

SKILL.md

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# Run axe-core via CLI npx axe-core-cli <url> --include main --reporter json 2>/dev/null # Or Lighthouse accessibility audit npx lighthouse <url> --only-categories=accessibility --output json 2>/dev/null | \ jq '.categories.accessibility.score, .audits | to_entries[] | select(.value.score < 1)'

Criterion

Check

Common Failure

1.1.1 Non-text Content

Every <img> has meaningful alt; decorative images use alt=""

<img src="logo.png"> with no alt

1.3.1 Info & Relationships

Structure conveyed via semantic HTML, not visual styling only

<div class="heading"> instead of <h2>

1.3.5 Identify Input Purpose

autocomplete attributes on personal data fields

Missing autocomplete="email"

1.4.1 Use of Color

Color is not the only means of conveying information

Red-only error indicators

1.4.3 Contrast (Min)

Text contrast ≥ 4.5:1 (3:1 for large text ≥18pt/14pt bold)

Light gray on white

1.4.4 Resize Text

Content usable at 200% zoom without scrolling horizontally

Fixed-width containers

1.4.10 Reflow

Content reflows at 320px width without 2D scrolling

Tables/cards breaking layout

1.4.11 Non-text Contrast

UI components (focus rings, form borders) ≥ 3:1 contrast

Faint input borders

Criterion

Check

Common Failure

2.1.1 Keyboard

All functionality available via keyboard

Click-only dropdowns

2.1.2 No Keyboard Trap

Focus can always be moved away with keyboard

Modal dialogs trapping focus

2.4.3 Focus Order

Tab order is logical and matches visual layout

DOM order mismatches visual

2.4.4 Link Purpose

Link text is meaningful in isolation

"Click here", "Read more"

2.4.7 Focus Visible

Keyboard focus indicator is always visible

CSS outline: none globally

2.4.11 Focus Not Obscured (new 2.2)

Sticky headers/footers don't fully cover focused element

Sticky nav covering inputs

2.4.12 Focus Not Obscured (Enhanced) (new 2.2)

Focused element is fully visible

—

2.5.3 Label in Name

Visible label text included in accessible name

Icon buttons without text

2.5.7 Dragging Movements (new 2.2)

All drag operations have single-pointer alternative

Drag-only sorting

2.5.8 Target Size (new 2.2)

Interactive targets ≥ 24×24 CSS pixels

Small icon buttons

Criterion

Check

Common Failure

3.1.1 Language of Page

<html lang="en"> set

Missing or wrong lang attribute

3.2.2 On Input

No automatic context change on focus

Auto-submit on radio select

3.3.1 Error Identification

Form errors identified in text, not color only

Red border without message

3.3.2 Labels or Instructions

All form fields have visible labels

Placeholder-only inputs

3.3.7 Redundant Entry (new 2.2)

Users not asked to re-enter info already provided

Shipping = billing re-entry

3.3.8 Accessible Authentication (new 2.2)

No cognitive function test required for auth

CAPTCHA without alternative

<div onclick="submit()">Submit</div>  <button aria-label="Close dialog">X Cancel</button>  <button aria-hidden="true" tabindex="0">Click me</button>  <div id="status"></div>  <label>Email</label><input type="email" />

Contrast ratio = (L1 + 0.05) / (L2 + 0.05) where L = relative luminance Required: - Normal text (<18pt, <14pt bold): ≥ 4.5:1 - Large text (≥18pt, ≥14pt bold): ≥ 3:1 - UI components & focus indicators: ≥ 3:1

╔══════════════════════════════════════════════════╗ ║ ACCESSIBILITY AUDIT — WCAG 2.2 Level AA ║ ║ Score: [n]/100 Violations: [n] ║ ╚══════════════════════════════════════════════════╝ CRITICAL (must fix before launch) [1.4.3] src/components/Button.tsx Contrast ratio: 2.8:1 (required: 4.5:1) Colors: #767676 on #FFFFFF Fix: Change text color to #595959 or darker [2.4.7] src/styles/global.css:14 Pattern: outline: none on :focus Fix: Remove or replace with visible focus style HIGH (required for AA compliance) [1.1.1] src/components/Avatar.tsx:8 <img src={user.photo}> — missing alt attribute Fix: alt={`${user.name} profile photo`} [2.5.8 NEW] src/components/IconButton.tsx Target size: 16×16px (required: 24×24px) Fix: Add min-width/min-height: 24px or padding MEDIUM (best practice) [3.3.2] src/components/LoginForm.tsx:22 Email input uses placeholder only, no <label> Fix: Add <label htmlFor="email">Email address</label>

Criterion

Check

Common Failure

1.1.1 Non-text Content

Every <img> has meaningful alt; decorative images use alt=""

<img src="logo.png"> with no alt

1.3.1 Info & Relationships

Structure conveyed via semantic HTML, not visual styling only

<div class="heading"> instead of <h2>

1.3.5 Identify Input Purpose

autocomplete attributes on personal data fields

Missing autocomplete="email"

1.4.1 Use of Color

Color is not the only means of conveying information

Red-only error indicators

1.4.3 Contrast (Min)

Text contrast ≥ 4.5:1 (3:1 for large text ≥18pt/14pt bold)

Light gray on white

1.4.4 Resize Text

Content usable at 200% zoom without scrolling horizontally

Fixed-width containers

1.4.10 Reflow

Content reflows at 320px width without 2D scrolling

Tables/cards breaking layout

1.4.11 Non-text Contrast

UI components (focus rings, form borders) ≥ 3:1 contrast

Faint input borders

Criterion

Check

Common Failure

2.1.1 Keyboard

All functionality available via keyboard

Click-only dropdowns

2.1.2 No Keyboard Trap

Focus can always be moved away with keyboard

Modal dialogs trapping focus

2.4.3 Focus Order

Tab order is logical and matches visual layout

DOM order mismatches visual

2.4.4 Link Purpose

Link text is meaningful in isolation

"Click here", "Read more"

2.4.7 Focus Visible

Keyboard focus indicator is always visible

CSS outline: none globally

2.4.11 Focus Not Obscured (new 2.2)

Sticky headers/footers don't fully cover focused element

Sticky nav covering inputs

2.4.12 Focus Not Obscured (Enhanced) (new 2.2)

Focused element is fully visible

—

2.5.3 Label in Name

Visible label text included in accessible name

Icon buttons without text

2.5.7 Dragging Movements (new 2.2)

All drag operations have single-pointer alternative

Drag-only sorting

2.5.8 Target Size (new 2.2)

Interactive targets ≥ 24×24 CSS pixels

Small icon buttons

Criterion

Check

Common Failure

3.1.1 Language of Page

<html lang="en"> set

Missing or wrong lang attribute

3.2.2 On Input

No automatic context change on focus

Auto-submit on radio select

3.3.1 Error Identification

Form errors identified in text, not color only

Red border without message

3.3.2 Labels or Instructions

All form fields have visible labels

Placeholder-only inputs

3.3.7 Redundant Entry (new 2.2)

Users not asked to re-enter info already provided

Shipping = billing re-entry

3.3.8 Accessible Authentication (new 2.2)

No cognitive function test required for auth

CAPTCHA without alternative

accessibility-audit

Purpose

Trigger

Prerequisites

Steps

Step 1 — Automated Scan (if URL available)

Step 2 — Perceivable (WCAG Principle 1)

Step 3 — Operable (WCAG Principle 2)

Step 4 — Understandable (WCAG Principle 3)

Step 5 — Robust (WCAG Principle 4) — ARIA & Screen Readers

Step 6 — Color Contrast Calculator

Output Format

Rules

Must

Never

Examples

Good Example

Bad Example

Purpose

Trigger

Prerequisites

Steps

Step 1 — Automated Scan (if URL available)

Step 2 — Perceivable (WCAG Principle 1)

Step 3 — Operable (WCAG Principle 2)

Step 4 — Understandable (WCAG Principle 3)

Step 5 — Robust (WCAG Principle 4) — ARIA & Screen Readers

Step 6 — Color Contrast Calculator

Output Format

Rules

Must

Never

Examples

Good Example

Bad Example

name	accessibility-audit
description	WCAG 2.2 Level AA accessibility audit for web applications. Checks perceivable (alt text, color contrast, captions), operable (keyboard navigation, focus management, WCAG 2.2 new criteria), understandable (labels, error messages), and robust (ARIA, screen reader compatibility). Produces violation table with WCAG criterion IDs and remediation. Triggers: accessibility audit, WCAG, a11y, screen reader, keyboard navigation, color contrast, ARIA audit, 無障礙, 可及性.
metadata	{"category":"dev"}