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Agent skill

Web Accessibility Audit (WCAG 2.1)

by tech-leads-club in tech-leads-club/agent-skills

Audits and improves web accessibility against WCAG 2.1, covering alt text, accessible names, color contrast, media alternatives and keyboard access.

MITAuto-check passedFrontend & Design

Install Web Accessibility Audit (WCAG 2.1)

skills CLI
$ npx skills add tech-leads-club/agent-skills --skill accessibility -a claude-code

Project install by default; add -g for ~/.claude/skills/.

GitHub CLI
$ gh skill install tech-leads-club/agent-skills accessibility --agent claude-code

Project scope by default; add --scope user for a personal install. Needs GitHub CLI 2.90.0 or later (public preview).

Manual copy
$ git clone --depth 1 https://github.com/tech-leads-club/agent-skills.git skills-src && mkdir -p .claude/skills && cp -r skills-src/'packages/skills-catalog/skills/(quality)/web-accessibility' .claude/skills/accessibility && rm -rf skills-src

Use ~/.claude/skills/ instead of .claude/skills for a personal install. The folder must contain SKILL.md.

Claude Code skills documentation · loads skills from .claude/skills/

Facts

Skill name
accessibility
GitHub stars
7k
Used in
2 other repos
Token cost
~3.3k tokens
SKILL.md length
370 words
Files
2 (incl. references)
Skills in repo
74
Repo updated
First seen
Licence
MIT

At a glance

Audits and improves web accessibility against WCAG 2.1, covering alt text, accessible names, color contrast, media alternatives and keyboard access.

  • Works in 5 steps: Missing form labels → Missing image alt text → Insufficient color contrast → …
  • Running an accessibility audit on a page or component
  • SKILL.md covers WCAG Principles: POUR, Conformance levels, Perceivable and Operable, plus 4 more sections
  • Calls npx and npm

What it does

Accessibility work is organized around WCAG 2.1 and Lighthouse accessibility audits, with the aim of making content usable by everyone, including people with disabilities. The skill lays out the four POUR principles (perceivable, operable, understandable and compatible with assistive technologies) and the A, AA and AAA conformance levels, noting that AA is a legal requirement in many jurisdictions.

The guidance gives before-and-after code for alt text on images, accessible names for icon buttons, a visually-hidden class, color contrast ratios (4.5:1 for normal text and 3:1 for large text at AA), not relying on color alone, alternatives for media, and keyboard access with no keyboard traps. A references/WCAG.md file holds further detail. It is not meant for SEO, general performance or audits that span several areas, which other skills handle.

When your agent uses it

  • Running an accessibility audit on a page or component
  • Fixing missing alt text, labels and accessible names
  • Checking color contrast against WCAG AA
  • Making a custom widget work with a keyboard and screen reader

Example prompts

  • “Do an a11y audit of the signup form and fix the WCAG problems you find.”
  • “Make the icon-only buttons in this toolbar accessible to screen readers.”
  • “Check the colors in styles.css against WCAG AA contrast.”

Workflow steps

5 steps, taken from the first numbered list in SKILL.md.

  1. Missing form labels
  2. Missing image alt text
  3. Insufficient color contrast
  4. Keyboard traps
  5. No focus indicators

What it can do on your machine

Read from SKILL.md and the folder at commit 6df68d5. It shows what the files ask for, not the result of running them.

  • Tool permissions

    Pre-approves nothing: there is no allowed-tools line, so your agent's usual permission prompts apply.

    From allowed-tools in the SKILL.md frontmatter.

  • Runs code

    Shell commands in SKILL.md call:

    • npx
    • npm

    From the folder's file list and the shell code blocks in SKILL.md.

  • Network

    Links to these hosts (documentation or services it may open):

    • w3.org
    • dequeuniversity.com

    From URLs in SKILL.md, links to its own repository left out.

  • Credentials

    Names no API keys, tokens, secrets or passwords.

    From names ending in _API_KEY, _TOKEN, _SECRET, _KEY or _PASSWORD in SKILL.md.

Context cost

Web Accessibility Audit (WCAG 2.1) loads about 3.3k tokens when it runs, and up to ~5.9k if it reads all its reference files. Until then it costs about 92 tokens; SKILL.md has 370 words of instructions outside code blocks.

Always · name and description, kept in context so the agent knows when to use it
~92
When it runs · the whole SKILL.md, loaded when a task matches
~3.3k
With references · SKILL.md plus every file in references/, read only if the agent opens them
~5.9k

Estimates: characters ÷ 4, the usual rule of thumb; real counts depend on the model's tokenizer. Scripts and assets cost tokens only if the agent reads them.

Safety

Auto-check passed

The automated check found no risky patterns in SKILL.md.

Automated static check — not a guarantee. Review scripts before installing. It scans the text of SKILL.md for risky patterns (piping downloads into a shell, reading credential files, hidden Unicode, destructive commands); files beside SKILL.md are not scanned.

SKILL.md

The full file from tech-leads-club/agent-skills at commit 6df68d5, republished under its MIT licence (© tech-leads-club). 370 words, ~3,254 tokens.

Download SKILL.mdSave it as .claude/skills/accessibility/SKILL.md (or your agent's skills folder). This skill also uses 1 other file; get the full folder from GitHub.
name
accessibility
description
Audit and improve web accessibility following WCAG 2.1 guidelines. Use when asked to "improve accessibility", "a11y audit", "WCAG compliance", "screen reader support", "keyboard navigation", or "make accessible". Do NOT use for SEO (use seo), performance (use core-web-vitals), or comprehensive site audits covering multiple areas (use web-quality-audit).
license
MIT
metadata.author
web-quality-skills
metadata.version
1.0

Accessibility (a11y)

Comprehensive accessibility guidelines based on WCAG 2.1 and Lighthouse accessibility audits. Goal: make content usable by everyone, including people with disabilities.

WCAG Principles: POUR

PrincipleDescription
PerceivableContent can be perceived through different senses
OperableInterface can be operated by all users
UnderstandableContent and interface are understandable
RobustContent works with assistive technologies

Conformance levels

LevelRequirementTarget
AMinimum accessibilityMust pass
AAStandard complianceShould pass (legal requirement in many jurisdictions)
AAAEnhanced accessibilityNice to have

Perceivable

Text alternatives (1.1)

Images require alt text:

html
<!-- ❌ Missing alt -->
<img src="chart.png" />

<!-- ✅ Descriptive alt -->
<img src="chart.png" alt="Bar chart showing 40% increase in Q3 sales" />

<!-- ✅ Decorative image (empty alt) -->
<img src="decorative-border.png" alt="" role="presentation" />

<!-- ✅ Complex image with longer description -->
<figure>
  <img src="infographic.png" alt="2024 market trends infographic" aria-describedby="infographic-desc" />
  <figcaption id="infographic-desc">
    <!-- Detailed description -->
  </figcaption>
</figure>

Icon buttons need accessible names:

html
<!-- ❌ No accessible name -->
<button>
  <svg><!-- menu icon --></svg>
</button>

<!-- ✅ Using aria-label -->
<button aria-label="Open menu">
  <svg aria-hidden="true"><!-- menu icon --></svg>
</button>

<!-- ✅ Using visually hidden text -->
<button>
  <svg aria-hidden="true"><!-- menu icon --></svg>
  <span class="visually-hidden">Open menu</span>
</button>

Visually hidden class:

css
.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}
Color contrast (1.4.3, 1.4.6)
Text SizeAA minimumAAA enhanced
Normal text (< 18px / < 14px bold)4.5:17:1
Large text (≥ 18px / ≥ 14px bold)3:14.5:1
UI components & graphics3:13:1
css
/* ❌ Low contrast (2.5:1) */
.low-contrast {
  color: #999;
  background: #fff;
}

/* ✅ Sufficient contrast (7:1) */
.high-contrast {
  color: #333;
  background: #fff;
}

/* ✅ Focus states need contrast too */
:focus-visible {
  outline: 2px solid #005fcc;
  outline-offset: 2px;
}

Don't rely on color alone:

html
<!-- ❌ Only color indicates error -->
<input class="error-border" />
<style>
  .error-border {
    border-color: red;
  }
</style>

<!-- ✅ Color + icon + text -->
<div class="field-error">
  <input aria-invalid="true" aria-describedby="email-error" />
  <span id="email-error" class="error-message">
    <svg aria-hidden="true"><!-- error icon --></svg>
    Please enter a valid email address
  </span>
</div>
Media alternatives (1.2)
html
<!-- Video with captions -->
<video controls>
  <source src="video.mp4" type="video/mp4" />
  <track kind="captions" src="captions.vtt" srclang="en" label="English" default />
  <track kind="descriptions" src="descriptions.vtt" srclang="en" label="Descriptions" />
</video>

<!-- Audio with transcript -->
<audio controls>
  <source src="podcast.mp3" type="audio/mp3" />
</audio>
<details>
  <summary>Transcript</summary>
  <p>Full transcript text...</p>
</details>

Operable

Keyboard accessible (2.1)

All functionality must be keyboard accessible:

javascript
// ❌ Only handles click
element.addEventListener('click', handleAction)

// ✅ Handles both click and keyboard
element.addEventListener('click', handleAction)
element.addEventListener('keydown', (e) => {
  if (e.key === 'Enter' || e.key === ' ') {
    e.preventDefault()
    handleAction()
  }
})

No keyboard traps:

javascript
// Modal focus management
function openModal(modal) {
  const focusableElements = modal.querySelectorAll(
    'button, [href], input, select, textarea, [tabindex]:not([tabindex="-1"])',
  )
  const firstElement = focusableElements[0]
  const lastElement = focusableElements[focusableElements.length - 1]

  // Trap focus within modal
  modal.addEventListener('keydown', (e) => {
    if (e.key === 'Tab') {
      if (e.shiftKey && document.activeElement === firstElement) {
        e.preventDefault()
        lastElement.focus()
      } else if (!e.shiftKey && document.activeElement === lastElement) {
        e.preventDefault()
        firstElement.focus()
      }
    }
    if (e.key === 'Escape') {
      closeModal()
    }
  })

  firstElement.focus()
}
Focus visible (2.4.7)
css
/* ❌ Never remove focus outlines */
*:focus {
  outline: none;
}

/* ✅ Use :focus-visible for keyboard-only focus */
:focus {
  outline: none;
}

:focus-visible {
  outline: 2px solid #005fcc;
  outline-offset: 2px;
}

/* ✅ Or custom focus styles */
button:focus-visible {
  box-shadow: 0 0 0 3px rgba(0, 95, 204, 0.5);
}
html
<body>
  <a href="#main-content" class="skip-link">Skip to main content</a>
  <header><!-- navigation --></header>
  <main id="main-content" tabindex="-1">
    <!-- main content -->
  </main>
</body>
css
.skip-link {
  position: absolute;
  top: -40px;
  left: 0;
  background: #000;
  color: #fff;
  padding: 8px 16px;
  z-index: 100;
}

.skip-link:focus {
  top: 0;
}
Timing (2.2)
javascript
// Allow users to extend time limits
function showSessionWarning() {
  const modal = createModal({
    title: 'Session Expiring',
    content: 'Your session will expire in 2 minutes.',
    actions: [
      { label: 'Extend session', action: extendSession },
      { label: 'Log out', action: logout },
    ],
    timeout: 120000, // 2 minutes to respond
  })
}
Motion (2.3)
css
/* Respect reduced motion preference */
@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
}

Understandable

Page language (3.1.1)
html
<!-- ❌ No language specified -->
<html>
  <!-- ✅ Language specified -->
  <html lang="en">
    <!-- ✅ Language changes within page -->
    <p>The French word for hello is <span lang="fr">bonjour</span>.</p>
  </html>
</html>
Consistent navigation (3.2.3)
html
<!-- Navigation should be consistent across pages -->
<nav aria-label="Main">
  <ul>
    <li><a href="/" aria-current="page">Home</a></li>
    <li><a href="/products">Products</a></li>
    <li><a href="/about">About</a></li>
  </ul>
</nav>
Form labels (3.3.2)
html
<!-- ❌ No label association -->
<input type="email" placeholder="Email" />

<!-- ✅ Explicit label -->
<label for="email">Email address</label>
<input type="email" id="email" name="email" autocomplete="email" required />

<!-- ✅ Implicit label -->
<label>
  Email address
  <input type="email" name="email" autocomplete="email" required />
</label>

<!-- ✅ With instructions -->
<label for="password">Password</label>
<input type="password" id="password" aria-describedby="password-requirements" />
<p id="password-requirements">Must be at least 8 characters with one number.</p>
Error handling (3.3.1, 3.3.3)
html
<!-- Announce errors to screen readers -->
<form novalidate>
  <div class="field" aria-live="polite">
    <label for="email">Email</label>
    <input type="email" id="email" aria-invalid="true" aria-describedby="email-error" />
    <p id="email-error" class="error" role="alert">Please enter a valid email address (e.g., name@example.com)</p>
  </div>
</form>
javascript
// Focus first error on submit
form.addEventListener('submit', (e) => {
  const firstError = form.querySelector('[aria-invalid="true"]')
  if (firstError) {
    e.preventDefault()
    firstError.focus()

    // Announce error summary
    const errorSummary = document.getElementById('error-summary')
    errorSummary.textContent = `${errors.length} errors found. Please fix them and try again.`
    errorSummary.focus()
  }
})

Robust

Valid HTML (4.1.1)
html
<!-- ❌ Duplicate IDs -->
<div id="content">...</div>
<div id="content">...</div>

<!-- ❌ Invalid nesting -->
<a href="/"><button>Click</button></a>

<!-- ✅ Unique IDs -->
<div id="main-content">...</div>
<div id="sidebar-content">...</div>

<!-- ✅ Proper nesting -->
<a href="/" class="button-link">Click</a>
ARIA usage (4.1.2)

Prefer native elements:

html
<!-- ❌ ARIA role on div -->
<div role="button" tabindex="0">Click me</div>

<!-- ✅ Native button -->
<button>Click me</button>

<!-- ❌ ARIA checkbox -->
<div role="checkbox" aria-checked="false">Option</div>

<!-- ✅ Native checkbox -->
<label><input type="checkbox" /> Option</label>

When ARIA is needed:

html
<!-- Custom tabs component -->
<div role="tablist" aria-label="Product information">
  <button role="tab" id="tab-1" aria-selected="true" aria-controls="panel-1">Description</button>
  <button role="tab" id="tab-2" aria-selected="false" aria-controls="panel-2" tabindex="-1">Reviews</button>
</div>
<div role="tabpanel" id="panel-1" aria-labelledby="tab-1">
  <!-- Panel content -->
</div>
<div role="tabpanel" id="panel-2" aria-labelledby="tab-2" hidden>
  <!-- Panel content -->
</div>
Live regions (4.1.3)
html
<!-- Status updates -->
<div aria-live="polite" aria-atomic="true" class="status">
  <!-- Content updates announced to screen readers -->
</div>

<!-- Urgent alerts -->
<div role="alert" aria-live="assertive">
  <!-- Interrupts current announcement -->
</div>
javascript
// Announce dynamic content changes
function showNotification(message, type = 'polite') {
  const container = document.getElementById(`${type}-announcer`)
  container.textContent = '' // Clear first
  requestAnimationFrame(() => {
    container.textContent = message
  })
}

Testing checklist

Automated testing
bash
# Lighthouse accessibility audit
npx lighthouse https://example.com --only-categories=accessibility

# axe-core
npm install @axe-core/cli -g
axe https://example.com
Manual testing
  • Keyboard navigation: Tab through entire page, use Enter/Space to activate
  • Screen reader: Test with VoiceOver (Mac), NVDA (Windows), or TalkBack (Android)
  • Zoom: Content usable at 200% zoom
  • High contrast: Test with Windows High Contrast Mode
  • Reduced motion: Test with prefers-reduced-motion: reduce
  • Focus order: Logical and follows visual order
Show full SKILL.md (127 more words)Show less
Screen reader commands
ActionVoiceOver (Mac)NVDA (Windows)
Start/Stop⌘ + F5Ctrl + Alt + N
Next itemVO + →↓
Previous itemVO + ←↑
ActivateVO + SpaceEnter
Headings listVO + U, then arrowsH / Shift + H
Links listVO + UK / Shift + K

Common issues by impact

Critical (fix immediately)
  1. Missing form labels
  2. Missing image alt text
  3. Insufficient color contrast
  4. Keyboard traps
  5. No focus indicators
Serious (fix before launch)
  1. Missing page language
  2. Missing heading structure
  3. Non-descriptive link text
  4. Auto-playing media
  5. Missing skip links
Moderate (fix soon)
  1. Missing ARIA labels on icons
  2. Inconsistent navigation
  3. Missing error identification
  4. Timing without controls
  5. Missing landmark regions

References

© tech-leads-club, MIT. Rendered from Markdown: HTML in the file is shown as text, images as links, and headings moved down two levels. Raw file

Files

SKILL.md and 1 other file (references) in packages/skills-catalog/skills/(quality)/web-accessibility of tech-leads-club/agent-skills.

  • SKILL.md
  • references/WCAG.md

Open the folder on GitHubat commit 6df68d5

Used in 2 other repositories

We found 2 copies of this SKILL.md (exact, near-identical or edited) in other folders, from 2 other GitHub owners. This page covers the copy in tech-leads-club/agent-skills, which our catalogue first saw on October 7, 2026.

Compare with similar skills

Web Accessibility Audit (WCAG 2.1) next to the 5 skills that share the most tags, products or categories with it. Stars are the repository's; “used in” counts other GitHub owners with a copy.

Web Accessibility Audit (WCAG 2.1) compared with similar skills
SkillStarsUsed inTokensAuto-checkLicenceRepo updated
Web Accessibility Audit (WCAG 2.1) this skilltech-leads-club/agent-skills7k2 repos~3.3kAutomated safety check: PassMIT
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Accessibility Reviewmarkmead/hyperui12k1 repos~1.1kAutomated safety check: PassMIT
Web Animation DesignbaptisteArno/typebot.io11k2 repos~2.7kAutomated safety check: PassCustom licence
Accessibility Fixeribelick/ui-skills9.6k4 repos~1.2kAutomated safety check: PassMIT
Wcag Audit PatternsvmDeshpande/ai-agent-automation17811 repos~610Automated safety check: PassApache-2.0

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Categories

Questions about Web Accessibility Audit (WCAG 2.1)

What does Web Accessibility Audit (WCAG 2.1) do?

Audits and improves web accessibility against WCAG 2.1, covering alt text, accessible names, color contrast, media alternatives and keyboard access. 1 and Lighthouse accessibility audits, with the aim of making content usable by everyone, including people with disabilities. The skill lays out the four POUR principles (perceivable, operable, understandable and compatible with assistive technologies) and the A, AA and AAA conformance levels, noting that AA is a legal requirement in many jurisdictions.

When should I use Web Accessibility Audit (WCAG 2.1)?

Web Accessibility Audit (WCAG 2.1) fits situations like: running an accessibility audit on a page or component; fixing missing alt text, labels and accessible names; checking color contrast against WCAG AA; making a custom widget work with a keyboard and screen reader.

How do I install Web Accessibility Audit (WCAG 2.1) in Claude Code?

Run `npx skills add tech-leads-club/agent-skills --skill accessibility -a claude-code`. Or copy the skill folder (packages/skills-catalog/skills/(quality)/web-accessibility in tech-leads-club/agent-skills) into .claude/skills/accessibility in your project. Claude Code loads it when a task matches its description.

How do I install Web Accessibility Audit (WCAG 2.1) in Codex?

Run `npx skills add tech-leads-club/agent-skills --skill accessibility -a codex`. Or copy the skill folder (packages/skills-catalog/skills/(quality)/web-accessibility in tech-leads-club/agent-skills) into .agents/skills/accessibility in your project. Codex loads it when a task matches its description.

Can I use Web Accessibility Audit (WCAG 2.1) in Cursor, Gemini CLI or GitHub Copilot?

Cursor, Gemini CLI, GitHub Copilot and OpenCode also load SKILL.md folders. With the skills CLI, run `npx skills add tech-leads-club/agent-skills --skill accessibility -a cursor` (or -a gemini-cli, github-copilot or opencode for the others). To copy it by hand, put the folder in .cursor/skills/accessibility, .gemini/skills/accessibility, .github/skills/accessibility and .opencode/skills/accessibility in your project.

What does Web Accessibility Audit (WCAG 2.1) need to run?

Going by SKILL.md and its folder, Web Accessibility Audit (WCAG 2.1) needs the command-line tools its instructions call (npx and npm).

Does Web Accessibility Audit (WCAG 2.1) access the network?

SKILL.md names 2 domains. As links in the text: w3.org and dequeuniversity.com. This is read from the text; nothing was executed.

Is Web Accessibility Audit (WCAG 2.1) safe to install?

Our automated static check of SKILL.md found no risky patterns, such as piping downloads into a shell, reading credential files or hidden Unicode. It is not a guarantee. Review the folder before installing.

What licence does Web Accessibility Audit (WCAG 2.1) use?

Web Accessibility Audit (WCAG 2.1) is published under the MIT licence (declared in SKILL.md). It allows redistribution, so the full SKILL.md is shown on this page.

How many tokens does Web Accessibility Audit (WCAG 2.1) use?

About 3.3k tokens (SKILL.md is roughly 13k characters). Agents keep only the skill's name and description in context until a task matches; then they load SKILL.md in full. Its references folder adds about 2.7k tokens, read only when the agent opens those files.

What are the alternatives to Web Accessibility Audit (WCAG 2.1)?

Skills that share tags, products or a category with Web Accessibility Audit (WCAG 2.1): Web Interface Guidelines Reviewer (vercel-labs/openreview, 1.7k stars), Accessibility Review (markmead/hyperui, 12k stars), Web Animation Design (baptisteArno/typebot.io, 11k stars) and Accessibility Fixer (ibelick/ui-skills, 9.6k stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.

Who maintains Web Accessibility Audit (WCAG 2.1)?

tech-leads-club (a GitHub organization) maintains it in tech-leads-club/agent-skills, which has 7,045 GitHub stars. The repository holds 74 skills in this directory. The repository was last updated on October 9, 2026.

Source: tech-leads-club/agent-skills on GitHub. Facts on this page come from the repository at the commit we read; the author's words are quoted as theirs.