kb-framework-accessibility

---

name: kb-framework-accessibility description: Reference data, not a reviewer. Framework-specific accessibility patterns and fix templates for React, Vue, Angular, Svelte, Next.js, and Tailwind CSS. license: MIT disable-model-invocation: true user-invocable: false metadata: tier: reference domain: cross-cutting output: none effort: low title: Framework Accessibility

Framework-Specific Accessibility Patterns

React / Next.js

Common Pitfalls

Each pattern, with its issue and fix.

Pattern	Issue	Fix
onClick on <div>	Not keyboard accessible	Use <button> or add role="button", tabIndex={0}, onKeyDown
dangerouslySetInnerHTML	May inject inaccessible content	Audit injected HTML for ARIA, headings, alt text
React.Fragment as root	May break landmark tree	Ensure fragments don't interrupt landmark nesting
Missing key on lists	Can cause focus loss on re-render	Use stable keys (not array index) for interactive lists
Portal without focus trap	Focus can escape to background	Wrap portal content in FocusTrap component
useEffect focus management	Focus may not fire on mount	Use useRef + useEffect with proper dependency array

Fix Templates

// Bad: div as button
<div onClick={handleClick}>Submit</div>

// Good: semantic button
<button onClick={handleClick}>Submit</button>

// Bad: image without alt in Next.js
<Image src="/hero.jpg" width={800} height={400} />

// Good: image with alt
<Image src="/hero.jpg" width={800} height={400} alt="Team collaborating in a modern office" />

// Bad: no focus management on route change
useEffect(() => {
  // nothing
}, [location]);

// Good: focus management on route change
useEffect(() => {
  const mainContent = document.getElementById('main-content');
  if (mainContent) {
    mainContent.focus();
    mainContent.scrollIntoView();
  }
}, [location]);

// Bad: link opening new tab
<a href={url} target="_blank">Resource</a>

// Good: link with new tab warning
<a href={url} target="_blank" rel="noopener noreferrer">
  Resource <span className="sr-only">(opens in new tab)</span>
</a>

Vue

Common Pitfalls

Each pattern, with its issue and fix.

Pattern	Issue	Fix
v-html with user content	May inject inaccessible markup	Sanitize and audit injected HTML
v-if on live regions	Removes element from DOM, breaks announcements	Use v-show for live regions instead
<transition> without focus	Focus lost when content transitions	Manage focus in @after-enter hook
<teleport> to body	Content outside app landmark tree	Add landmark roles to teleported content

Fix Templates

<!-- Bad: v-if on live region -->
<div v-if="message" aria-live="polite">{{ message }}</div>

<!-- Good: v-show keeps element in DOM -->
<div v-show="message" aria-live="polite">{{ message }}</div>

<!-- Bad: no focus after transition -->
<transition name="fade">
  <div v-if="showModal" class="modal">...</div>
</transition>

<!-- Good: focus managed after transition -->
<transition name="fade" @after-enter="focusModal">
  <div v-if="showModal" ref="modal" class="modal" tabindex="-1">...</div>
</transition>

Angular

Common Pitfalls

Each pattern, with its issue and fix.

Pattern	Issue	Fix
[aria-label] binding	Invalid - ARIA is not a property	Use [attr.aria-label]
*ngFor without trackBy	Focus loss on list re-render	Add trackBy function
No LiveAnnouncer	Route changes not announced	Inject LiveAnnouncer and announce navigation
OnPush + live regions	Change detection may not trigger	Use ChangeDetectorRef.markForCheck()

Fix Templates

// Bad: ARIA binding
<button [aria-label]="label">X</button>

// Good: ARIA attribute binding
<button [attr.aria-label]="label">X</button>

// Bad: ngFor without trackBy
<li *ngFor="let item of items">{{ item.name }}</li>

// Good: ngFor with trackBy
<li *ngFor="let item of items; trackBy: trackById">{{ item.name }}</li>

// Route change announcements
constructor(private liveAnnouncer: LiveAnnouncer, private router: Router) {
  this.router.events.pipe(
    filter(event => event instanceof NavigationEnd)
  ).subscribe((event: NavigationEnd) => {
    this.liveAnnouncer.announce(`Navigated to ${this.getPageTitle()}`);
  });
}

Svelte

Common Pitfalls

Each pattern, with its issue and fix.

Pattern	Issue	Fix
{#if} without focus management	Focus lost when content appears	Use use:action to focus new content
transition: without motion check	Animations play regardless of user preference	Add prefers-reduced-motion check
on:click on non-interactive	Not keyboard accessible	Use <button> or add keyboard handlers

Fix Templates

<!-- Bad: click on div -->
<div on:click={toggle}>Toggle</div>

<!-- Good: keyboard accessible -->
<button on:click={toggle}>Toggle</button>

<!-- Bad: animation without motion preference -->
<div transition:fly={{ y: 200 }}>Content</div>

<!-- Good: respects motion preference -->
<div transition:fly={{ y: reducedMotion ? 0 : 200, duration: reducedMotion ? 0 : 300 }}>Content</div>

<script>
  const reducedMotion = window.matchMedia('(prefers-reduced-motion: reduce)').matches;
</script>

Tailwind CSS

Common Pitfalls

Each pattern, with its issue and fix.

Pattern	Issue	Fix
outline-none	Removes focus indicator	Pair with ring-2 ring-offset-2 focus-visible:ring-blue-500
text-gray-400 on bg-white	Fails 4.5:1 contrast	Use text-gray-600 or darker
No motion-reduce: variant	Animations ignore user preference	Add motion-reduce:transition-none
Missing focus: styles	No visible focus indicator	Add focus:ring-2 focus:ring-blue-500
sr-only missing	Screen reader text not available	Add <span class="sr-only">description</span>

Contrast-Safe Tailwind Pairs

Each background, with its minimum text and ratio.

Background	Minimum Text	Ratio
bg-white	text-gray-600	4.55:1
bg-white	text-gray-700	6.62:1
bg-gray-50	text-gray-700	6.29:1
bg-gray-900	text-gray-300	5.92:1
bg-blue-600	text-white	5.23:1
bg-red-600	text-white	4.54:1
bg-green-700	text-white	4.58:1

Fix Templates

<!-- Bad: no focus indicator -->
<button class="bg-blue-500 text-white px-4 py-2 rounded outline-none">
  Submit
</button>

<!-- Good: visible focus indicator -->
<button class="bg-blue-500 text-white px-4 py-2 rounded focus:outline-none focus-visible:ring-2 focus-visible:ring-blue-500 focus-visible:ring-offset-2">
  Submit
</button>

<!-- Bad: low contrast -->
<p class="text-gray-400">Important information</p>

<!-- Good: adequate contrast -->
<p class="text-gray-700">Important information</p>

<!-- Bad: animation without motion preference -->
<div class="transition-transform duration-300 hover:scale-105">Card</div>

<!-- Good: respects motion preference -->
<div class="transition-transform duration-300 hover:scale-105 motion-reduce:transition-none motion-reduce:hover:scale-100">Card</div>