ACCESSIBILITY-CHECKLIST.md

Accessibility Checklist for Solid-UI Theme System

Date: January 15, 2026
Scope: WCAG 2.1 Level AA Compliance
Related: Theme System Analysis

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Overview

This checklist ensures the theme system implementation meets WCAG 2.1 Level AA accessibility standards, making Solid applications usable by people with disabilities including visual, auditory, motor, and cognitive impairments.

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Phase 1: Foundation (Weeks 1-2)

✅ Color & Contrast

• Color Contrast Ratios (WCAG 2.1 - 1.4.3)

  • Normal text: Minimum 4.5:1 contrast ratio
  • Large text (18pt+): Minimum 3:1 contrast ratio
  • UI components: Minimum 3:1 contrast ratio
  • Test all theme color combinations
  • Document contrast ratios for each theme

• Color Independence (WCAG 2.1 - 1.4.1)

  • Information not conveyed by color alone
  • Use icons + text labels together
  • Error states use icons, not just red color
  • Success states use icons, not just green color

• High Contrast Mode (WCAG 2.1 - 1.4.6)

  • Implement @media (prefers-contrast: high) support
  • Test with Windows High Contrast Mode
  • Borders visible in high contrast
  • Focus indicators work in high contrast

✅ Typography & Readability

• Text Resize (WCAG 2.1 - 1.4.4)

  • Text resizable up to 200% without loss of functionality
  • Use relative units (em, rem) instead of px
  • Test at 200% zoom in browser
  • No horizontal scrolling at 200% zoom

• Font Choices

  • Use readable sans-serif fonts (Inter, Roboto)
  • Minimum 16px base font size
  • Line height at least 1.5x font size
  • Paragraph spacing at least 1.5x line height

• Reduced Motion (WCAG 2.1 - 2.3.3)

  • Implement @media (prefers-reduced-motion: reduce)
  • Disable animations when user prefers reduced motion
  • Provide instant theme switching option
  • Test with motion preference enabled

✅ Focus Management

• Visible Focus Indicators (WCAG 2.1 - 2.4.7)

  • Focus outline visible on all interactive elements
  • Focus outline minimum 2px width
  • High contrast between focus and background
  • Focus outline not obscured by content
  • Custom focus styles meet 3:1 contrast ratio

• Focus Order (WCAG 2.1 - 2.4.3)

  • Logical tab order (left to right, top to bottom)
  • Theme switcher in logical position
  • Skip to main content link provided
  • No keyboard traps

• Focus Visible (CSS)

  /* Example implementation */
  :focus-visible {
    outline: 2px solid var(--sui-focus-color);
    outline-offset: 2px;
  }
  
  /* Don't hide focus for keyboard users */
  :focus:not(:focus-visible) {
    outline: none;
  }
  

✅ CSS Variables for Accessibility

/* src/themes/foundation/accessibility.css */
:root {
  /* Focus indicators */
  --sui-focus-color: #667eea;
  --sui-focus-width: 2px;
  --sui-focus-offset: 2px;
  
  /* Minimum touch targets */
  --sui-touch-target-min: 44px;
  
  /* Readable text */
  --sui-line-height: 1.5;
  --sui-paragraph-spacing: 1.5em;
}

/* High contrast mode */
@media (prefers-contrast: high) {
  :root {
    --sui-border: #000;
    --sui-text: #000;
    --sui-bg: #fff;
    --sui-focus-color: #000;
  }
}

/* Reduced motion */
@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}

---

Phase 2: Components (Weeks 3-4)

✅ Theme Switcher Widget

• Keyboard Accessible (WCAG 2.1 - 2.1.1)

  • Operable with keyboard only
  • Space/Enter to activate
  • Arrow keys to navigate options
  • Escape to close if dropdown

• ARIA Attributes

  <select 
    id="theme-switcher"
    aria-label="Choose color theme"
    aria-describedby="theme-help">
    <option value="classic">Classic</option>
    <option value="solid">Solid</option>
    <option value="wave">Wave</option>
    <option value="telegram">Telegram</option>
  </select>
  <span id="theme-help" class="sr-only">
    Changes the color scheme of the application
  </span>
  

• Change Announcements

  • Announce theme change to screen readers
  • Use ARIA live region
  • Polite announcement (not assertive)

✅ Buttons & Interactive Elements

• Button Accessibility (WCAG 2.1 - 4.1.2)

  • Use semantic <button> elements
  • Descriptive accessible names
  • Disabled state communicated to screen readers
  • Loading state announced

• Touch Target Size (WCAG 2.1 - 2.5.5)

  • Minimum 44x44px touch targets
  • Adequate spacing between targets
  • Test on mobile devices

• ARIA for Buttons

  <!-- Standard button -->
  <button type="button" aria-label="Save changes">
    💾
  </button>
  
  <!-- Toggle button -->
  <button 
    type="button" 
    role="switch"
    aria-checked="false"
    aria-label="Dark mode">
    Toggle
  </button>
  
  <!-- Button with loading state -->
  <button 
    type="button"
    aria-busy="true"
    aria-label="Saving...">
    Saving...
  </button>
  

✅ Form Controls

• Labels (WCAG 2.1 - 1.3.1, 3.3.2)

  • All inputs have associated labels
  • Label text describes purpose
  • Use <label for="id"> or aria-label
  • Required fields marked

• Error Messages (WCAG 2.1 - 3.3.1, 3.3.3)

  • Errors clearly identified
  • Error descriptions provided
  • Errors associated with fields (aria-describedby)
  • Error summary at top of form

• Input Validation

  <div class="form-field">
    <label for="username">Username *</label>
    <input 
      id="username"
      type="text"
      aria-required="true"
      aria-invalid="false"
      aria-describedby="username-error username-hint">
    <span id="username-hint" class="hint">
      Must be 3-20 characters
    </span>
    <span id="username-error" role="alert" class="error" hidden>
      Username is required
    </span>
  </div>
  

✅ Chat Components

• Message List (WCAG 2.1 - 1.3.1)

  • Semantic list markup (<ul>, <li>)
  • Messages have role="article" or similar
  • Timestamps readable by screen readers
  • Author names clearly associated

• Live Regions (WCAG 2.1 - 4.1.3)

  • New messages announced
  • Use aria-live="polite" for chat
  • Use aria-live="assertive" for alerts
  • Limit announcement frequency

• Chat Accessibility

  <div class="chat-container" role="log" aria-label="Chat messages">
    <ul class="messages" aria-live="polite" aria-atomic="false">
      <li class="message" role="article">
        <img src="avatar.jpg" alt="John Doe" class="avatar">
        <div class="message-content">
          <span class="author">John Doe</span>
          <time datetime="2026-01-15T10:30:00">10:30 AM</time>
          <p>Hello world!</p>
        </div>
      </li>
    </ul>
  </div>
  
  <!-- Announcement for screen readers only -->
  <div role="status" aria-live="polite" class="sr-only">
    New message from John Doe: Hello world!
  </div>
  

✅ Dialogs & Modals

• Dialog Accessibility (WCAG 2.1 - 2.4.3)

  • Use role="dialog" or role="alertdialog"
  • aria-labelledby for title
  • aria-describedby for description
  • Focus trapped inside dialog
  • Escape key closes dialog
  • Focus returns to trigger on close

• Modal Implementation

  <div 
    role="dialog"
    aria-modal="true"
    aria-labelledby="dialog-title"
    aria-describedby="dialog-desc">
    <h2 id="dialog-title">Confirm Action</h2>
    <p id="dialog-desc">Are you sure you want to proceed?</p>
    <button type="button">Cancel</button>
    <button type="button">Confirm</button>
  </div>
  

---

Phase 3: Advanced Patterns (Weeks 5-6)

✅ Complex Widgets

• Tabs (WCAG 2.1 - 4.1.2)

  • role="tablist" on container
  • role="tab" on tab buttons
  • role="tabpanel" on panels
  • aria-selected on active tab
  • Arrow key navigation

• Accordions

  • Semantic heading structure
  • Button triggers with aria-expanded
  • aria-controls linking
  • Keyboard navigation

• Menus

  • role="menu" and role="menuitem"
  • Arrow key navigation
  • Home/End key support
  • Escape to close

✅ Dynamic Content

• Loading States (WCAG 2.1 - 4.1.3)

  • aria-busy="true" during loading
  • Loading message announced
  • Skeleton screens have aria-label
  • Spinners have accessible names

• Infinite Scroll

  • Announce loading more items
  • "Load More" button alternative
  • Total count provided
  • Progress indicated

✅ Landmark Regions

• Page Structure (WCAG 2.1 - 2.4.1)

  • <header> or role="banner"
  • <nav> or role="navigation"
  • <main> or role="main"
  • <aside> or role="complementary"
  • <footer> or role="contentinfo"

• Skip Links

  <a href="#main-content" class="skip-link">
    Skip to main content
  </a>
  <a href="#navigation" class="skip-link">
    Skip to navigation
  </a>
  
  <style>
  .skip-link {
    position: absolute;
    top: -40px;
    left: 0;
    background: var(--sui-primary);
    color: white;
    padding: 8px;
    z-index: 100;
  }
  
  .skip-link:focus {
    top: 0;
  }
  </style>
  

---

Phase 4: Testing & Validation (Week 7)

✅ Automated Testing

• axe DevTools

  • Run on all pages
  • Fix all critical issues
  • Document known issues
  • Regular CI/CD checks

• WAVE

  • Check each theme
  • Verify contrast ratios
  • Check structure
  • Validate ARIA

• Lighthouse

  • Accessibility score > 95
  • All categories checked
  • Performance impact minimal

✅ Manual Testing

• Keyboard Navigation

  • Tab through all interactive elements
  • No keyboard traps
  • Visible focus at all times
  • Logical tab order
  • All actions keyboard accessible

• Screen Reader Testing

  • NVDA (Windows - free)
  • JAWS (Windows - commercial)
  • VoiceOver (Mac - built-in)
  • TalkBack (Android)
  • VoiceOver (iOS)

• Screen Reader Checklist

  • All content readable
  • Headings properly nested
  • Links descriptive
  • Forms properly labeled
  • Dynamic updates announced
  • Images have alt text

• Browser Testing

  • Chrome + ChromeVox
  • Firefox
  • Safari
  • Edge
  • Mobile browsers

✅ Visual Testing

• Zoom Testing

  • 200% zoom without horizontal scroll
  • 400% zoom still usable
  • Text doesn't overlap
  • All content accessible

• Color Blindness

  • Test with color blindness simulators
  • Deuteranopia (red-green)
  • Protanopia (red-green)
  • Tritanopia (blue-yellow)
  • Information not color-dependent

✅ User Testing

• Real Users with Disabilities

  • Screen reader users
  • Keyboard-only users
  • Low vision users
  • Cognitive disability users
  • Motor disability users

• Feedback Collection

  • Document issues found
  • Prioritize fixes
  • Iterate and retest
  • Continuous improvement

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Testing Tools & Resources

Browser Extensions

• axe DevTools - https://www.deque.com/axe/devtools/
• WAVE - https://wave.webaim.org/extension/
• Accessibility Insights - https://accessibilityinsights.io/
• Color Contrast Analyzer - Chrome/Firefox

Screen Readers

• NVDA (Free) - https://www.nvaccess.org/
• JAWS (Commercial) - https://www.freedomscientific.com/products/software/jaws/
• VoiceOver (Built-in Mac/iOS)
• TalkBack (Built-in Android)

Testing Services

• axe Monitor - Automated accessibility monitoring
• UsableNet - Accessibility testing platform
• Tenon.io - API-based accessibility testing

Documentation

• WCAG 2.1 - https://www.w3.org/WAI/WCAG21/quickref/
• ARIA Authoring Practices - https://www.w3.org/WAI/ARIA/apg/
• WebAIM - https://webaim.org/
• A11y Project - https://www.a11yproject.com/

---

Screen Reader Only (SR-Only) Utility

/* Visually hidden but accessible to screen readers */
.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border-width: 0;
}

/* Focusable when navigated to via keyboard */
.sr-only-focusable:focus {
  position: static;
  width: auto;
  height: auto;
  padding: inherit;
  margin: inherit;
  overflow: visible;
  clip: auto;
  white-space: normal;
}

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Success Criteria

Phase 1 (Foundation)

• ✅ All color contrasts meet WCAG AA (4.5:1 minimum)
• ✅ Focus indicators visible on all interactive elements
• ✅ Reduced motion preference respected
• ✅ High contrast mode supported

Phase 2 (Components)

• ✅ All form fields properly labeled
• ✅ Theme switcher fully keyboard accessible
• ✅ ARIA attributes correct and validated
• ✅ Touch targets minimum 44x44px

Phase 3 (Advanced)

• ✅ Complex widgets follow ARIA patterns
• ✅ Dynamic content updates announced
• ✅ Landmark regions properly defined
• ✅ Skip links functional

Phase 4 (Testing)

• ✅ axe DevTools: 0 critical issues
• ✅ Lighthouse accessibility: >95 score
• ✅ Manual keyboard testing: 100% pass
• ✅ Screen reader testing: 100% pass
• ✅ User testing: Positive feedback

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Ongoing Maintenance

• Regular Audits

  • Quarterly accessibility reviews
  • Update with new WCAG guidelines
  • Monitor user feedback
  • Fix issues promptly

• Documentation

  • Maintain accessibility guide
  • Document known limitations
  • Provide VPAT (Voluntary Product Accessibility Template)
  • Update as features change

• Training

  • Developer accessibility training
  • QA accessibility testing training
  • Design accessibility guidelines
  • Continuous education

---

Status: Draft for Implementation
Last Updated: January 15, 2026
Next Review: After Phase 1 completion

まず ACCESSIBILITY-CHECKLIST.md と関連する ANALYSIS-solid-chat-styles-for-solid-ecosystem.md を確認し、次に参照されている src/themes/foundation/accessibility.css パスを調べてください。チェックリストはテーマスタイル、ウィジェット、フォーム、チャット、ダイアログ、テスト、ユーザーによる検証に及びます。この issue では、より狭い成果物や完了範囲は定義されていません。