How do I install the Accessibility Checker skill?

Run npx skillmds@latest add meraj-uddin-malik/accessibility-checker in your terminal (requires Node.js), paste this page's agent-chat prompt into Claude, Cursor, or any MCP-connected agent, or download the SKILL.md file and copy it into your agent's skills directory.

What does the Accessibility Checker skill do?

Accessibility Checker It is listed under Web & Frontend on SkillMD.

Is Accessibility Checker safe to use?

This skill has not completed SkillMD's automated safety review yet. SkillMD never runs a skill's scripts for you; review the SKILL.md before installing.

Which AI agents work with Accessibility Checker?

This skill is tagged as working with Claude Code, Claude.ai, OpenAI Codex. SKILL.md is an open format, so most agents that read a skills directory can load it too.

Is Accessibility Checker free to use?

Yes. Installing skills from SkillMD is free, and the skill stays under its author's original license.

Who published Accessibility Checker?

Meraj-Uddin-Malik (@meraj-uddin-malik) published this skill. Their other Agent Skills are listed on their SkillMD profile.

Accessibility Checker by meraj-uddin-malik

Name: Accessibility Checker
Author: Meraj-Uddin-Malik

Accessibility Checker

A skill that audits and improves web accessibility (a11y) to ensure the portfolio website is usable by everyone, including people with disabilities.

Trigger Phrases

This skill activates when the user wants to check or improve accessibility:

"check accessibility"
"audit a11y"
"fix accessibility issues"
"make it accessible"
"accessibility audit"
"check WCAG compliance"

Instructions

When this skill is invoked, perform a comprehensive accessibility audit covering these key areas:

Step 1: Review the File to Audit

If the user specifies a file, read it first. Otherwise, ask which file or component needs to be audited.

Step 2: Color Contrast Audit (WCAG)

Check that all text meets WCAG color contrast requirements:

WCAG Standards

WCAG AA (Minimum):
- Normal text (< 18pt): 4.5:1 contrast ratio
- Large text (≥ 18pt or ≥ 14pt bold): 3:1 contrast ratio
- UI components and graphics: 3:1 contrast ratio
WCAG AAA (Enhanced):
- Normal text: 7:1 contrast ratio
- Large text: 4.5:1 contrast ratio

What to Check

Text on backgrounds: Body text, headings, links, buttons
Interactive elements: Button text, form labels, input text
Dark mode: Ensure dark theme also meets contrast standards
Disabled states: Even disabled elements should be distinguishable
Icons and graphics: Non-decorative icons need sufficient contrast

Common Issues

/* ❌ BAD - Insufficient contrast */
.text {
  color: #999999; /* Light gray */
  background: #ffffff; /* White - only 2.8:1 contrast */
}

/* ✅ GOOD - Meets WCAG AA */
.text {
  color: #525252; /* Dark gray */
  background: #ffffff; /* White - 7.5:1 contrast */
}

/* ❌ BAD - Primary color might not have enough contrast */
.button {
  color: #ffffff;
  background: #4d94ff; /* Only 3.1:1 with white text */
}

/* ✅ GOOD - Use darker primary for better contrast */
.button {
  color: #ffffff;
  background: var(--color-primary-600); /* Better contrast */
}

Color Contrast Fixes

Provide specific fixes for any contrast issues:

Darken light text or lighten dark backgrounds
Use design system colors that meet standards
Test in both light and dark modes
Add text shadows for text over images (use with caution)
Avoid pure gray (#808080) - use darker or lighter shades

Step 3: Keyboard Navigation Audit

Ensure all interactive elements are keyboard accessible:

What to Check

Tab order: Logical flow through interactive elements
Focus indicators: Visible focus states on all interactive elements
Skip links: "Skip to main content" link for navigation bypass
Trapped focus: Modals/dialogs trap and restore focus properly
No keyboard traps: Users can navigate away from all elements
Keyboard shortcuts: All mouse actions have keyboard equivalents

Common Issues

<!-- ❌ BAD - div used as button, not keyboard accessible -->
<div me</div>

<!-- ✅ GOOD - Semantic button, keyboard accessible -->
<button me</button>

<!-- ❌ BAD - No visible focus state -->
<style>
  button:focus {
    outline: none; /* Never do this! */
  }
</style>

<!-- ✅ GOOD - Clear focus indicator -->
<style>
  button:focus {
    outline: 2px solid var(--color-primary-500);
    outline-offset: 2px;
  }
</style>

<!-- ❌ BAD - Missing skip link -->
<body>
  <nav>...</nav>
  <main>...</main>
</body>

<!-- ✅ GOOD - Skip link included -->
<body>
  <a href="#main-content" class="skip-link">Skip to main content</a>
  <nav>...</nav>
  <main id="main-content">...</main>
</body>

Keyboard Navigation Fixes

Add skip links for bypassing navigation
Ensure visible focus states with proper outline or border
Use semantic HTML (<button>, <a>, <input>, etc.)
Test tab order - should be logical and sequential
Handle modal focus - trap focus within modals, restore on close
Add keyboard event handlers where needed

// ✅ GOOD - Handle both click and keyboard events
button.addEventListener('click', handleAction);
button.addEventListener('keydown', (e) => {
  if (e.key === 'Enter' || e.key === ' ') {
    e.preventDefault();
    handleAction();
  }
});

Skip Link Implementation

<a href="#main-content" class="skip-link">Skip to main content</a>

<style>
.skip-link {
  position: absolute;
  top: -40px;
  left: 0;
  background: var(--bg-primary);
  color: var(--text-primary);
  padding: var(--space-2) var(--space-4);
  text-decoration: none;
  border-radius: 0 0 4px 0;
  z-index: 100;
}

.skip-link:focus {
  top: 0;
  outline: 2px solid var(--color-primary-500);
  outline-offset: 2px;
}
</style>

Step 4: ARIA Labels & Semantic HTML Audit

Check for proper ARIA attributes and semantic markup:

What to Check

Semantic HTML: Using proper HTML5 elements
ARIA labels: Buttons, links, and icons have descriptive labels
ARIA roles: Correct roles for custom widgets
ARIA states: aria-expanded, aria-hidden, aria-current, etc.
Landmark regions: Main, navigation, complementary, contentinfo
Heading hierarchy: Proper H1 → H2 → H3 structure
Form labels: All inputs have associated labels

Common Issues

<!-- ❌ BAD - Generic div without semantic meaning -->
<div class="navigation">
  <div class="link">Home</div>
</div>

<!-- ✅ GOOD - Semantic HTML with proper roles -->
<nav role="navigation" aria-label="Main navigation">
  <a href="#home">Home</a>
</nav>

<!-- ❌ BAD - Icon button without label -->
<button class="theme-toggle">
  🌙
</button>

<!-- ✅ GOOD - Icon button with aria-label -->
<button class="theme-toggle" aria-label="Toggle dark mode">
  <span aria-hidden="true">🌙</span>
</button>

<!-- ❌ BAD - Improper heading hierarchy -->
<h1>Page Title</h1>
<h3>Section Title</h3> <!-- Skipped H2! -->

<!-- ✅ GOOD - Proper heading hierarchy -->
<h1>Page Title</h1>
<h2>Section Title</h2>
<h3>Subsection Title</h3>

<!-- ❌ BAD - Input without label -->
<input type="email" placeholder="Email">

<!-- ✅ GOOD - Input with proper label -->
<label for="email">Email Address</label>
<input type="email" id="email" placeholder="you@example.com">

<!-- ❌ BAD - Decorative image with alt text -->
<img src="decorative-pattern.svg" alt="Decorative pattern">

<!-- ✅ GOOD - Decorative image with empty alt -->
<img src="decorative-pattern.svg" alt="">
<!-- OR use aria-hidden for purely decorative images -->
<img src="decorative-pattern.svg" aria-hidden="true" alt="">

ARIA Best Practices

Use semantic HTML first: Don't use ARIA if HTML element exists
Don't override semantics: <button role="heading"> is wrong
Required attributes: Some ARIA roles require specific attributes
Dynamic content: Update ARIA states when content changes
Landmark labels: Give unique labels to multiple landmarks

<!-- ✅ GOOD - Proper landmark structure -->
<header role="banner">
  <nav role="navigation" aria-label="Main navigation">...</nav>
</header>

<main role="main" id="main-content">
  <section aria-labelledby="projects-title">
    <h2 id="projects-title">Projects</h2>
    ...
  </section>
</main>

<aside role="complementary" aria-label="Related links">...</aside>

<footer role="contentinfo">...</footer>

Form Accessibility

<!-- ✅ GOOD - Accessible form with all necessary attributes -->
<form>
  <div class="form-group">
    <label for="name">
      Name <span aria-label="required">*</span>
    </label>
    <input
      type="text"
      id="name"
      name="name"
      required
      aria-required="true"
      aria-describedby="name-hint"
    >
    <span id="name-hint" class="form-hint">Enter your full name</span>
  </div>

  <div class="form-group">
    <label for="email">Email</label>
    <input
      type="email"
      id="email"
      name="email"
      aria-describedby="email-error"
      aria-invalid="false"
    >
    <span id="email-error" class="error" role="alert"></span>
  </div>

  <fieldset>
    <legend>Preferred Contact Method</legend>
    <label>
      <input type="radio" name="contact" value="email"> Email
    </label>
    <label>
      <input type="radio" name="contact" value="phone"> Phone
    </label>
  </fieldset>

  <button type="submit">Send Message</button>
</form>

Step 5: Screen Reader Support Audit

Ensure the site works well with screen readers:

What to Check

Alt text: All images have descriptive alt text (or empty for decorative)
Link text: Links have descriptive text (not "click here")
Button labels: Buttons describe their action
Form labels: All inputs have associated labels
Reading order: Content flows logically in DOM order
Hidden content: Use aria-hidden for decorative elements
Live regions: Use aria-live for dynamic content
Language: HTML lang attribute is set

Common Issues

<!-- ❌ BAD - Non-descriptive link text -->
<a href="/project1">Click here</a>

<!-- ✅ GOOD - Descriptive link text -->
<a href="/project1">View E-commerce Platform project</a>

<!-- ❌ BAD - Image without alt text -->
<img src="project-screenshot.jpg">

<!-- ✅ GOOD - Descriptive alt text -->
<img src="project-screenshot.jpg" alt="E-commerce platform homepage showing product grid and navigation">

<!-- ❌ BAD - Icon used for meaning without label -->
<button>
  <svg>...</svg>
</button>

<!-- ✅ GOOD - Icon with descriptive label -->
<button aria-label="Open menu">
  <svg aria-hidden="true">...</svg>
</button>

<!-- ❌ BAD - No language attribute -->
<html>

<!-- ✅ GOOD - Language specified -->
<html lang="en">

<!-- ❌ BAD - Dynamic content without announcement -->
<div id="notifications"></div>

<!-- ✅ GOOD - Dynamic content with live region -->
<div id="notifications" role="status" aria-live="polite" aria-atomic="true"></div>

Screen Reader Best Practices

Meaningful alt text: Describe what the image conveys, not what it is
Empty alt for decorative: Use alt="" for purely decorative images
Descriptive links: Link text should make sense out of context
Button vs link: Use <button> for actions, <a> for navigation
Form feedback: Announce errors and success messages
Loading states: Announce when content is loading
Reading order: Ensure visual order matches DOM order

// ✅ GOOD - Announce dynamic content to screen readers
function showNotification(message) {
  const notification = document.getElementById('notification');
  notification.textContent = message;
  notification.setAttribute('role', 'status');
  notification.setAttribute('aria-live', 'polite');
}

// ✅ GOOD - Announce form errors
function showError(inputId, errorMessage) {
  const input = document.getElementById(inputId);
  const errorSpan = document.getElementById(`${inputId}-error`);

  input.setAttribute('aria-invalid', 'true');
  errorSpan.textContent = errorMessage;
  errorSpan.setAttribute('role', 'alert');

  // Focus the input for keyboard users
  input.focus();
}

Step 6: Generate Accessibility Report

After auditing, provide a structured report:

Report Format

## Accessibility Audit Report

### Summary
- Issues found: [number]
- WCAG Level: [AA/AAA]
- Severity: [Critical/High/Medium/Low]

### Color Contrast Issues
1. [Component] - [Issue description]
   - Current: [current values]
   - Fix: [recommended fix]

### Keyboard Navigation Issues
1. [Component] - [Issue description]
   - Fix: [recommended fix]

### ARIA & Semantic HTML Issues
1. [Component] - [Issue description]
   - Fix: [recommended fix]

### Screen Reader Issues
1. [Component] - [Issue description]
   - Fix: [recommended fix]

### Recommended Actions
1. [Priority 1 - Critical fixes]
2. [Priority 2 - Important fixes]
3. [Priority 3 - Nice-to-have improvements]

Step 7: Provide Fixes

For each issue found, provide the specific code fixes:

Show the current problematic code
Explain why it's an issue
Provide the corrected code
Explain the improvement

Accessibility Checklist

Use this comprehensive checklist for audits:

Structure & Semantics

Valid, semantic HTML5
Proper heading hierarchy (H1 → H2 → H3, no skips)
Only one H1 per page
Landmark regions used (<header>, <nav>, <main>, <footer>)
Unique landmark labels if multiple of same type
Language attribute set (<html lang="en">)
Page has a descriptive title

Color & Contrast

Text contrast meets WCAG AA (4.5:1 for normal, 3:1 for large)
Interactive element contrast meets WCAG AA (3:1)
Dark mode colors also meet contrast standards
Color is not the only means of conveying information
Link text is distinguishable from surrounding text

Keyboard Navigation

All interactive elements are keyboard accessible
Tab order is logical and sequential
Focus indicators are clearly visible
Skip to main content link provided
No keyboard traps
Modal focus is properly managed (trapped and restored)
Dropdowns and menus are keyboard accessible
Custom widgets have proper keyboard support

Images & Media

All images have alt text (or alt="" for decorative)
Alt text is descriptive and meaningful
Decorative images use alt="" or aria-hidden="true"
Icons have labels or are marked as decorative
Complex images have longer descriptions
Image-based links/buttons have descriptive alt text

Forms

All inputs have associated labels
Labels use <label> element with for attribute
Required fields are marked (visually and with aria-required)
Error messages are associated with inputs (aria-describedby)
Error messages use role="alert"
Fieldsets and legends used for grouped inputs
Placeholder text is not used as the only label
Form validation is accessible

Links & Buttons

Link text is descriptive (not "click here")
Links and buttons are distinguishable
Icon buttons have aria-label
Links that open new windows are indicated
External links are indicated (visually or with aria-label)
Current page is indicated in navigation (aria-current)

ARIA

ARIA used appropriately (HTML semantics preferred)
ARIA roles are correct
Required ARIA attributes are present
ARIA states updated when content changes
aria-label or aria-labelledby used appropriately
aria-describedby used for additional context
aria-hidden used for decorative content
aria-live used for dynamic content

Dynamic Content

Loading states are announced
Error messages are announced (role="alert")
Success messages are announced
Content changes are announced (aria-live)
Dynamically added content is accessible

Responsive & Mobile

Text can be resized to 200% without loss of content
Site works in landscape and portrait orientations
No horizontal scrolling at 320px width
Touch targets are at least 44x44px
Mobile menu is keyboard accessible

Testing Tools

Recommend using these tools for accessibility testing:

Automated Testing

Lighthouse (Chrome DevTools): Built-in accessibility audit
axe DevTools: Browser extension for accessibility testing
WAVE: Web accessibility evaluation tool
Pa11y: Command-line accessibility testing
HTML Validator: Check for valid HTML

Manual Testing

Keyboard navigation: Tab through entire page
Screen reader: Test with NVDA (Windows), JAWS (Windows), or VoiceOver (Mac/iOS)
Zoom: Test at 200% zoom
Color contrast: Use Color Contrast Analyzer tool
Mobile testing: Test on actual devices

Contrast Checkers

WebAIM Contrast Checker: https://webaim.org/resources/contrastchecker/
Contrast Ratio: https://contrast-ratio.com/
Color Contrast Analyzer: Desktop app

Common Accessibility Patterns

Accessible Modal

<div class="modal" role="dialog" aria-modal="true" aria-labelledby="modal-title">
  <div class="modal-overlay"></div>
  <div class="modal-content">
    <h2 id="modal-title">Modal Title</h2>
    <button class="modal-close" aria-label="Close modal">×</button>
    <p>Modal content...</p>
    <button>Confirm</button>
    <button>Cancel</button>
  </div>
</div>

<script>
// Trap focus within modal
function trapFocus(modal) {
  const focusableElements = modal.querySelectorAll(
    'button, [href], input, select, textarea, [tabindex]:not([tabindex="-1"])'
  );
  const firstElement = focusableElements[0];
  const lastElement = focusableElements[focusableElements.length - 1];

  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();
    }
  });
}
</script>

Accessible Dropdown Menu

<nav>
  <button
    aria-expanded="false"
    aria-controls="dropdown-menu"
    aria-haspopup="true"
  >
    Menu
  </button>
  <ul id="dropdown-menu" role="menu" hidden>
    <li role="none">
      <a href="#" role="menuitem">Item 1</a>
    </li>
    <li role="none">
      <a href="#" role="menuitem">Item 2</a>
    </li>
  </ul>
</nav>

<script>
button.addEventListener('click', () => {
  const isExpanded = button.getAttribute('aria-expanded') === 'true';
  button.setAttribute('aria-expanded', !isExpanded);
  menu.hidden = isExpanded;
});
</script>

Accessible Tabs

<div class="tabs">
  <div role="tablist" aria-label="Project categories">
    <button role="tab" aria-selected="true" aria-controls="panel-1" id="tab-1">
      All
    </button>
    <button role="tab" aria-selected="false" aria-controls="panel-2" id="tab-2" tabindex="-1">
      Web Apps
    </button>
    <button role="tab" aria-selected="false" aria-controls="panel-3" id="tab-3" tabindex="-1">
      Mobile
    </button>
  </div>

  <div role="tabpanel" id="panel-1" aria-labelledby="tab-1">
    Content for All...
  </div>
  <div role="tabpanel" id="panel-2" aria-labelledby="tab-2" hidden>
    Content for Web Apps...
  </div>
  <div role="tabpanel" id="panel-3" aria-labelledby="tab-3" hidden>
    Content for Mobile...
  </div>
</div>

Notes

Accessibility is not optional - it's a legal requirement in many countries
Good accessibility improves usability for everyone
Test with real screen readers, not just automated tools
Involve people with disabilities in testing when possible
Accessibility should be considered from the start, not added at the end
WCAG AA is the standard most organizations aim for
Keep up with WCAG updates and best practices
Document accessibility features and testing procedures

Accessibility Checker

File contents

Accessibility Checker

Trigger Phrases

Instructions

Step 1: Review the File to Audit

Step 2: Color Contrast Audit (WCAG)

WCAG Standards

What to Check

Common Issues

Color Contrast Fixes

Step 3: Keyboard Navigation Audit

What to Check

Common Issues

Keyboard Navigation Fixes

Skip Link Implementation

Step 4: ARIA Labels & Semantic HTML Audit

What to Check

Common Issues

ARIA Best Practices

Form Accessibility

Step 5: Screen Reader Support Audit

What to Check

Common Issues

Screen Reader Best Practices

Step 6: Generate Accessibility Report

Report Format

Step 7: Provide Fixes

Accessibility Checklist

Structure & Semantics

Color & Contrast

Keyboard Navigation

Images & Media

Forms

Links & Buttons

ARIA

Dynamic Content

Responsive & Mobile

Testing Tools

Automated Testing

Manual Testing

Contrast Checkers

Common Accessibility Patterns

Accessible Modal

Accessible Dropdown Menu

Accessible Tabs

Notes

Related skills

Frequently asked questions

How do I install the Accessibility Checker skill?

What does the Accessibility Checker skill do?

Is Accessibility Checker safe to use?

Which AI agents work with Accessibility Checker?

Is Accessibility Checker free to use?

Who published Accessibility Checker?