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Implement WCAG 2.2 AA accessibility — semantic HTML, ARIA, keyboard navigation,
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Basierend auf der SOC-Berufsklassifikation
| name | accessibility |
| description | Implement WCAG 2.2 AA accessibility — semantic HTML, ARIA, keyboard navigation, |
Implement WCAG 2.2 AA accessibility — semantic HTML, ARIA, keyboard navigation, screen reader support, color contrast, and focus management — ensuring the application is usable by everyone, regardless of ability.
Inaccessible applications exclude 15-20% of users and violate legal requirements (ADA, Section 508, EAA). This skill audits for accessibility violations and produces fixes that make applications perceivable, operable, understandable, and robust for all users.
Before launch. During development (shift left). When an accessibility audit reveals violations. As a continuous practice, not a one-time fix.
Application URL or source code, target WCAG level (AA default), assistive technology requirements.
# Accessibility Audit & Remediation: ARAYA Dashboard
## Audit Summary (WCAG 2.2 AA)
| Principle | Violations | Fixed | Remaining |
|-----------|-----------|-------|-----------|
| Perceivable | 8 | 8 | 0 ✅ |
| Operable | 12 | 10 | 2 🟡 |
| Understandable | 3 | 3 | 0 ✅ |
| Robust | 5 | 5 | 0 ✅ |
## Critical Fixes Applied
### Fix #1: Color contrast (8 violations)
```diff
- color: #94a3b8; /* 2.8:1 ratio — FAILS AA (needs 4.5:1) */
+ color: #64748b; /* 4.7:1 ratio — PASSES AA ✅ */
- <input type="email" placeholder="Email" />
+ <label htmlFor="email">Email</label>
+ <input id="email" type="email" autocomplete="email" />
function Modal({ isOpen, onClose, children }: ModalProps) {
const modalRef = useRef<HTMLDivElement>(null);
useEffect(() => {
if (!isOpen) return;
const modal = modalRef.current!;
const focusableElements = modal.querySelectorAll(
'button, [href], input, select, textarea, [tabindex]:not([tabindex="-1"])'
);
const firstFocusable = focusableElements[0] as HTMLElement;
const lastFocusable = focusableElements[focusableElements.length - 1] as HTMLElement;
// Focus first element when modal opens
firstFocusable?.focus();
function handleKeyDown(e: KeyboardEvent) {
if (e.key === "Escape") {
onClose();
return;
}
if (e.key !== "Tab") return;
// Trap focus inside modal
if (e.shiftKey) {
if (document.activeElement === firstFocusable) {
e.preventDefault();
lastFocusable?.focus();
}
} else {
if (document.activeElement === lastFocusable) {
e.preventDefault();
firstFocusable?.focus();
}
}
}
modal.addEventListener("keydown", handleKeyDown);
return () => modal.removeEventListener("keydown", handleKeyDown);
}, [isOpen, onClose]);
return isOpen ? (
<div role="dialog" aria-modal="true" aria-label="Dialog" ref={modalRef}>
{children}
</div>
) : null;
}
alt text (or alt="" for decorative):focus-visible)<label>, errors use role="alert"<html lang="en"> set correctly
## POUR Principles (WCAG Foundation)
### Perceivable
- Text alternatives for non-text content (alt text)
- Captions for audio/video
- Content adaptable without losing meaning
- Sufficient color contrast (4.5:1 normal, 3:1 large)
- Content usable at 200% zoom without horizontal scroll
### Operable
- All functionality available from keyboard
- No keyboard traps
- Enough time to read and use content
- No content that causes seizures (< 3 flashes/second)
- Navigable: skip links, descriptive headings, focus order
### Understandable
- Language declared (`<html lang="en">`)
- Predictable: consistent navigation, no unexpected changes
- Input assistance: labels, error messages, help text
### Robust
- Valid, semantic HTML
- ARIA used correctly — when HTML semantics aren't enough
- Compatible with current and future assistive technologies
## Steps
1. Run automated audit: axe DevTools, Lighthouse, or WAVE
2. Manual testing: keyboard navigation, screen reader (VoiceOver/NVDA), 200% zoom
3. Fix violations by priority: Critical (blocks access) → High (major difficulty) → Medium (inconvenience) → Low (best practice)
4. Integrate into development workflow: lint rules (eslint-plugin-jsx-a11y), PR checklist, CI audit
5. Test with real assistive technology users when possible
6. Document accessibility statement for the application
## Rules
- No ARIA is better than bad ARIA — use semantic HTML first
- Every `<img>` must have `alt` (descriptive for content, `alt=""` for decorative)
- Color is never the sole differentiator — add icons, underlines, or patterns
- Focus must always be visible (`:focus-visible`, never `outline: none` without replacement)
- Tab order must follow visual order — don't use `tabindex > 0`
- Modal dialogs: focus trap, Escape to close, focus returns to trigger on close
- Accessibility is continuous, not a launch checklist — audit every sprint
## Done Criteria
- [ ] All steps completed as specified
- [ ] Output validated against requirements
- [ ] Status reported with confidence score
- [ ] Evidence artifacts captured
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