// Implement WCAG 2.2 compliant interfaces with mobile accessibility, inclusive design patterns, and assistive technology support. Use when auditing accessibility, implementing ARIA patterns, building for screen readers, or ensuring inclusive user experiences.
| name | accessibility-compliance |
| description | Implement WCAG 2.2 compliant interfaces with mobile accessibility, inclusive design patterns, and assistive technology support. Use when auditing accessibility, implementing ARIA patterns, building for screen readers, or ensuring inclusive user experiences. |
Master accessibility implementation to create inclusive experiences that work for everyone, including users with disabilities.
| Level | Criterion | Description |
|---|---|---|
| A | 1.1.1 | Non-text content has text alternatives |
| A | 1.3.1 | Info and relationships programmatically determinable |
| A | 2.1.1 | All functionality keyboard accessible |
| A | 2.4.1 | Skip to main content mechanism |
| AA | 1.4.3 | Contrast ratio 4.5:1 (text), 3:1 (large text) |
| AA | 1.4.11 | Non-text contrast 3:1 |
| AA | 2.4.7 | Focus visible |
| AA | 2.5.8 | Target size minimum 24x24px (NEW in 2.2) |
| AAA | 1.4.6 | Enhanced contrast 7:1 |
| AAA | 2.5.5 | Target size minimum 44x44px |
interface ButtonProps extends React.ButtonHTMLAttributes<HTMLButtonElement> {
variant?: 'primary' | 'secondary';
isLoading?: boolean;
}
function AccessibleButton({
children,
variant = 'primary',
isLoading = false,
disabled,
...props
}: ButtonProps) {
return (
<button
// Disable when loading
disabled={disabled || isLoading}
// Announce loading state to screen readers
aria-busy={isLoading}
// Describe the button's current state
aria-disabled={disabled || isLoading}
className={cn(
// Visible focus ring
'focus-visible:outline-none focus-visible:ring-2 focus-visible:ring-offset-2',
// Minimum touch target size (44x44px)
'min-h-[44px] min-w-[44px]',
variant === 'primary' && 'bg-primary text-primary-foreground',
(disabled || isLoading) && 'opacity-50 cursor-not-allowed'
)}
{...props}
>
{isLoading ? (
<>
<span className="sr-only">Loading</span>
<Spinner aria-hidden="true" />
</>
) : (
children
)}
</button>
);
}
import * as React from 'react';
import { FocusTrap } from '@headlessui/react';
interface DialogProps {
isOpen: boolean;
onClose: () => void;
title: string;
children: React.ReactNode;
}
function AccessibleDialog({ isOpen, onClose, title, children }: DialogProps) {
const titleId = React.useId();
const descriptionId = React.useId();
// Close on Escape key
React.useEffect(() => {
const handleKeyDown = (e: KeyboardEvent) => {
if (e.key === 'Escape' && isOpen) {
onClose();
}
};
document.addEventListener('keydown', handleKeyDown);
return () => document.removeEventListener('keydown', handleKeyDown);
}, [isOpen, onClose]);
// Prevent body scroll when open
React.useEffect(() => {
if (isOpen) {
document.body.style.overflow = 'hidden';
}
return () => {
document.body.style.overflow = '';
};
}, [isOpen]);
if (!isOpen) return null;
return (
<div
role="dialog"
aria-modal="true"
aria-labelledby={titleId}
aria-describedby={descriptionId}
>
{/* Backdrop */}
<div
className="fixed inset-0 bg-black/50"
aria-hidden="true"
onClick={onClose}
/>
{/* Focus trap container */}
<FocusTrap>
<div className="fixed inset-0 flex items-center justify-center p-4">
<div className="bg-background rounded-lg shadow-lg max-w-md w-full p-6">
<h2 id={titleId} className="text-lg font-semibold">
{title}
</h2>
<div id={descriptionId}>{children}</div>
<button
onClick={onClose}
className="absolute top-4 right-4"
aria-label="Close dialog"
>
<X className="h-4 w-4" />
</button>
</div>
</div>
</FocusTrap>
</div>
);
}
function AccessibleForm() {
const [errors, setErrors] = React.useState<Record<string, string>>({});
return (
<form aria-describedby="form-errors" noValidate>
{/* Error summary for screen readers */}
{Object.keys(errors).length > 0 && (
<div
id="form-errors"
role="alert"
aria-live="assertive"
className="bg-destructive/10 border border-destructive p-4 rounded-md mb-4"
>
<h2 className="font-semibold text-destructive">
Please fix the following errors:
</h2>
<ul className="list-disc list-inside mt-2">
{Object.entries(errors).map(([field, message]) => (
<li key={field}>
<a href={`#${field}`} className="underline">
{message}
</a>
</li>
))}
</ul>
</div>
)}
{/* Required field with error */}
<div className="space-y-2">
<label htmlFor="email" className="block font-medium">
Email address
<span aria-hidden="true" className="text-destructive ml-1">
*
</span>
<span className="sr-only">(required)</span>
</label>
<input
id="email"
name="email"
type="email"
required
aria-required="true"
aria-invalid={!!errors.email}
aria-describedby={errors.email ? 'email-error' : 'email-hint'}
className={cn(
'w-full px-3 py-2 border rounded-md',
errors.email && 'border-destructive'
)}
/>
{errors.email ? (
<p id="email-error" className="text-sm text-destructive" role="alert">
{errors.email}
</p>
) : (
<p id="email-hint" className="text-sm text-muted-foreground">
We'll never share your email.
</p>
)}
</div>
<button type="submit" className="mt-4">
Submit
</button>
</form>
);
}
function SkipLink() {
return (
<a
href="#main-content"
className={cn(
// Hidden by default, visible on focus
'sr-only focus:not-sr-only',
'focus:absolute focus:top-4 focus:left-4 focus:z-50',
'focus:bg-background focus:px-4 focus:py-2 focus:rounded-md',
'focus:ring-2 focus:ring-primary'
)}
>
Skip to main content
</a>
);
}
// In layout
function Layout({ children }) {
return (
<>
<SkipLink />
<header>...</header>
<nav aria-label="Main navigation">...</nav>
<main id="main-content" tabIndex={-1}>
{children}
</main>
<footer>...</footer>
</>
);
}
function useAnnounce() {
const [message, setMessage] = React.useState('');
const announce = React.useCallback(
(text: string, priority: 'polite' | 'assertive' = 'polite') => {
setMessage(''); // Clear first to ensure re-announcement
setTimeout(() => setMessage(text), 100);
},
[]
);
const Announcer = () => (
<div
role="status"
aria-live="polite"
aria-atomic="true"
className="sr-only"
>
{message}
</div>
);
return { announce, Announcer };
}
// Usage
function SearchResults({ results, isLoading }) {
const { announce, Announcer } = useAnnounce();
React.useEffect(() => {
if (!isLoading && results) {
announce(`${results.length} results found`);
}
}, [results, isLoading, announce]);
return (
<>
<Announcer />
<ul>{/* results */}</ul>
</>
);
}
// Contrast ratio utilities
function getContrastRatio(foreground: string, background: string): number {
const fgLuminance = getLuminance(foreground);
const bgLuminance = getLuminance(background);
const lighter = Math.max(fgLuminance, bgLuminance);
const darker = Math.min(fgLuminance, bgLuminance);
return (lighter + 0.05) / (darker + 0.05);
}
// WCAG requirements
const CONTRAST_REQUIREMENTS = {
// Normal text (<18pt or <14pt bold)
normalText: {
AA: 4.5,
AAA: 7,
},
// Large text (>=18pt or >=14pt bold)
largeText: {
AA: 3,
AAA: 4.5,
},
// UI components and graphics
uiComponents: {
AA: 3,
},
};
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