Accessibility

Standard: WCAG 2.2 AA required · AAA aspirational Stack: React 19 · shadcn/ui · Tailwind CSS v4 · Radix UI (radix-ui v1.4.3) POUR Principles: Perceivable · Operable · Understandable · Robust

Implement WCAG 2.2 AA compliant accessibility in React 19 components using the draft_v0 stack. Items marked (AAA) exceed the required AA level and are aspirational best practices to pursue where feasible.

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POUR Reference Map

Principle	Key Topics	Reference Files
Perceivable	Alt text, landmarks, headings, data tables, color contrast, non-text contrast, text spacing, reflow	semantic-html.md, mobile-touch.md
Operable	Keyboard, focus management, focus not obscured, skip links, page titles, target size, dragging, pointer gestures	keyboard-navigation.md, focus-management.md, mobile-touch.md, wcag22-new-criteria.md
Understandable	ARIA, forms, error handling, auth, redundant entry, consistent help, live regions	aria-attributes.md, forms-a11y.md
Robust	Screen reader support, status messages, automated + manual testing, VPAT, CI/CD	testing-a11y.md

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WCAG 2.2 New Criteria — Enterprise Baseline

WCAG 2.2 added 9 success criteria not present in WCAG 2.1. All AA items are required; AAA items are aspirational.

SC	Title	Level	Requirement in One Line
2.4.11	Focus Not Obscured (Minimum)	AA	Focused element not fully hidden behind sticky/fixed UI chrome
2.4.12	Focus Not Obscured (Enhanced)	AAA	Focused element not obscured at all — not even partially
2.4.13	Focus Appearance	AAA	Focus indicator ≥ 2px perimeter, 3:1 contrast ratio
2.5.7	Dragging Movements	AA	Every drag action has a single-pointer (click/tap) alternative
2.5.8	Target Size (Minimum)	AA	Interactive targets ≥ 24×24 CSS pixels
3.2.6	Consistent Help	A	Help mechanisms in same relative position across pages
3.3.7	Redundant Entry	A	Previously entered data auto-populated or selectable
3.3.8	Accessible Authentication (Minimum)	AA	No cognitive puzzle required in auth unless alternative exists
3.3.9	Accessible Authentication (Enhanced)	AAA	No cognitive test in any auth step, no exceptions

See wcag22-new-criteria.md for detailed implementation guidance, code examples, common failures, and test procedures for each criterion.

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Accessibility Utilities in This Project

Tool / Pattern	How to Use	Notes
FocusScope	import { FocusScope } from 'radix-ui'	Focus trapping for modals/dialogs. Already installed (v1.4.3).
sr-only	className="sr-only"	Visually hidden, screen-reader visible text.
focus-visible:	focus-visible:ring-[3px] focus-visible:ring-ring/50	Focus ring on keyboard interaction only (not mouse click).
motion-reduce:	motion-reduce:transition-none	Respects prefers-reduced-motion OS preference.
aria-*:	aria-invalid:border-destructive	Style elements based on ARIA state via Tailwind variant.
scroll-mt-20	focus-visible:scroll-mt-20	Scroll margin for Focus Not Obscured (2.4.11 AA).
min-h-6 min-w-6	className="min-h-6 min-w-6"	24×24px minimum target size (2.5.8 AA).
min-h-[44px] min-w-[44px]	className="min-h-[44px] min-w-[44px]"	44×44px recommended target size (2.5.5 AAA).
Custom hooks	src/client/hooks/ (@/hooks)	useKeyPress, useReducedMotion, useDocumentTitle, useAnnounce.

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shadcn/Radix Built-in Accessibility

shadcn/ui components are accessible by default — built on Radix UI primitives that handle ARIA roles, keyboard navigation, and focus management automatically. Do not re-implement what these components already provide.

Component	What Radix Handles Automatically
Dialog	role="dialog", aria-modal, focus trap (FocusScope), Escape to close, return focus on close
AlertDialog	role="alertdialog", focus trap, prevents accidental Escape dismissal
DropdownMenu	role="menu" / menuitem, roving tabindex, Arrow keys, Escape to close
Select	role="listbox" / option, Arrow keys, type-ahead search
Tabs	role="tablist" / tab / tabpanel, Arrow Left/Right navigation
Checkbox	role="checkbox", Space to toggle, aria-checked
Tooltip	role="tooltip", hoverable (pointer can move over it), dismissible with Escape, persistent
Popover	Focus-managed popup, Escape to close, returns focus to trigger
Accordion	aria-expanded, Arrow keys for panel navigation
Slider	role="slider", aria-valuenow / min / max, Arrow key adjustments
Switch	role="switch", aria-checked, Space/Enter to toggle

Install via: npx shadcn@latest add dialog dropdown-menu select tabs — components appear in src/client/components/ui/ and must never be modified directly.

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Landmark Regions

Use native HTML5 elements — they carry implicit ARIA roles and need no role attribute.

Landmark	Element	aria-label needed?	Notes
Banner	<header>	No	Top-level only; one per page
Navigation	<nav>	Yes (if multiple exist)	Label each distinctly
Main	<main>	No	One per page; add id="main-content" tabIndex={-1}
Complementary	<aside>	Yes	Describe the supporting content
Contentinfo	<footer>	No	Top-level only; one per page
Search	<search>	No	Preferred over role="search"

Rules: one <main> per page · label every <nav> when multiple exist · never nest <main> inside another landmark · give <main> id="main-content" tabIndex={-1} for skip-link targeting.

See semantic-html.md for the full AppLayout implementation.

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Skip Links

Skip links bypass repeated navigation — required by WCAG 2.4.1 (Level A). Place <SkipLink /> as the first element in <App />. It uses sr-only focus:not-sr-only so it appears only on keyboard Tab.

Requirements:

• First focusable element in DOM order
• Href target (#main-content) must have tabIndex={-1} to receive programmatic focus
• For multi-section pages add more: "Skip to search", "Skip to filters"

See focus-management.md for the SkipLink component and App.tsx placement.

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Page Title Management

WCAG 2.4.2 (Level A): every page needs a unique, descriptive document.title that updates on route change.

• Call useDocumentTitle(pageTitle) in every route component. Format: "Page Name — Site Name".
• Add <RouteAnnouncer /> once in <App /> — announces the new title to screen readers on navigation without moving focus.

See focus-management.md for both implementations.

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Keyboard Navigation

See keyboard-navigation.md for:

• Required keys by component type (button, link, menu, tabs, modal, combobox, tree, data grid, carousel, toolbar)
• useKeyPress hook
• Roving tabindex pattern
• Data grid two-dimensional navigation model (Arrow + Home/End/Ctrl+Home/Ctrl+End)
• Tree view expand/collapse key model
• Carousel Previous/Next/Pause patterns
• Pointer cancellation (WCAG 2.5.2 AA)

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ARIA Attributes

See aria-attributes.md for:

• Button, input, checkbox, radio group, switch/toggle patterns
• Dialog/modal, alert, menu patterns
• Combobox (autocomplete input + listbox), data grid, tree view, carousel patterns
• Tooltip, breadcrumb, pagination, loading/spinner patterns
• Live region and status message patterns

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Focus Management

See focus-management.md for:

• FocusScope (Radix UI) — focus trapping for modals
• Return focus pattern — restore trigger element focus on close
• Focus Not Obscured (WCAG 2.4.11 AA) — scroll-margin-top fix for sticky headers
• Skip link focus target setup
• Focus management on SPA route change

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Screen Reader Announcements

Live Regions in JSX

Place live region containers in your layout so they persist between renders — the container must exist in the DOM before content is injected:

// Polite — screen reader finishes current speech before announcing
<div aria-live="polite" aria-atomic="true">
  {statusMessage}
</div>

// Assertive — interrupts screen reader immediately (use sparingly)
<div role="alert" aria-live="assertive">
  {errorMessage}
</div>

// Status updates (WCAG 4.1.3 A) — equivalent to aria-live="polite" + aria-atomic
<div role="status">
  {`${resultCount} results found`}
</div>

Reusable Announcement Hook

For imperative announcements (filter applied, item saved, search complete) without moving focus, use the useAnnounce hook from @/hooks/useAnnounce.

See aria-attributes.md for the implementation.

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Reduced Motion

See reduced-motion.md for:

• useReducedMotion hook
• Tailwind motion-reduce: variant (preferred for most cases)
• Framer Motion useReducedMotion integration
• CSS @media (prefers-reduced-motion: reduce) global overrides
• WCAG 2.3.3 Animation from Interactions (AAA)

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Color Contrast

Minimum Ratios (WCAG 2.2 AA)

Content	Required Ratio
Normal text (< 18pt / < 14pt bold)	4.5:1
Large text (≥ 18pt or ≥ 14pt bold)	3:1
UI components & graphical objects (borders, icons, chart lines)	3:1 (SC 1.4.11)
Inactive/disabled UI, pure decoration	No requirement

(AAA) Enhanced contrast (SC 1.4.6): Normal text 7:1 · Large text 4.5:1

Compliant Combinations (Project Design System)

Use Tailwind semantic token pairs — they map to oklch values in src/client/index.css:

Pair	Token classes	Notes
Body text	text-foreground bg-background	~16:1 — passes ✔
Primary action	bg-primary text-primary-foreground	passes ✔
Destructive / error	bg-destructive text-destructive-foreground	passes ✔
Secondary surface	bg-secondary text-secondary-foreground	passes ✔
Muted text	text-muted-foreground	⚠ Verify at your font size

Use WebAIM Contrast Checker or APCA Calculator to verify oklch values when adding new combinations.

Non-text Contrast (WCAG 1.4.11 AA)

Input borders, button outlines, checkbox frames, focus rings, and icon-only controls must have 3:1 contrast against adjacent colors. Use border-input / border-primary tokens and verify them in the contrast checker when customizing.

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Visible Focus

Use Tailwind's focus-visible: variant (keyboard only — does not appear on mouse click). Follow the pattern from src/client/components/ui/button.tsx:

focus-visible:ring-[3px] focus-visible:ring-ring/50 focus-visible:outline-none

Add focus-visible:scroll-mt-20 to prevent the focused element hiding behind a sticky header (WCAG 2.4.11 AA).

• Never use focus: alone for ring styles — it triggers on mouse too
• Never override with raw CSS — Tailwind utilities keep the --ring token consistent
• (AAA) 2.4.13 — focus indicator must encircle with ≥ 2px perimeter and ≥ 3:1 contrast between focused/unfocused states

See focus-management.md for the sticky-header fix.

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Screen Reader Only Text

// Icon-only button — always provide sr-only label
<button aria-label="Close modal">
  <XIcon aria-hidden="true" className="h-4 w-4" />
</button>

// Or use sr-only span (either approach is valid)
<button>
  <XIcon aria-hidden="true" className="h-4 w-4" />
  <span className="sr-only">Close modal</span>
</button>

// Reverse sr-only to make content visible again
<span className="not-sr-only">Visible text</span>

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Forms & Input

See forms-a11y.md for:

• autocomplete attributes and WCAG 1.3.5 Identify Input Purpose (AA)
• Redundant Entry — WCAG 3.3.7 (A): auto-populate previously entered data in multi-step flows
• Accessible Authentication — WCAG 3.3.8 (AA) / 3.3.9 (AAA): no cognitive tests in auth flows; password manager and paste must work
• fieldset/legend for grouped inputs (radio groups, checkboxes, date parts)
• Multi-step form state management and progress communication
• Comprehensive error identification, description, and suggestion patterns

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Semantic HTML

See semantic-html.md for:

• img alt text decision tree (informative vs decorative vs functional)
• Decorative images: alt="" + aria-hidden="true"
• SVG accessibility: role="img", <title>, <desc>, aria-labelledby
• Landmark regions in depth (header, nav, main, aside, footer)
• Heading hierarchy rules (h1–h6, one h1 per page, no skipping levels)
• Data tables: <caption>, scope, headers attribute for complex tables
• Ordered vs. unordered lists — when to use each

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Mobile & Touch

See mobile-touch.md for:

• Target Size (AA): 24×24 CSS px minimum — WCAG 2.5.8
• Target Size (AAA): 44×44 CSS px recommended — WCAG 2.5.5
• Pointer Gestures (AA): multi-touch gesture alternatives — WCAG 2.5.1
• Pointer Cancellation (AA): activate on pointerup, not pointerdown — WCAG 2.5.2
• Orientation (AA): support portrait and landscape — WCAG 1.3.4
• Motion Actuation (AA): device-motion (shake/tilt) alternatives — WCAG 2.5.4
• Dragging Movements (AA): single-pointer alternative for all drag UIs — WCAG 2.5.7
• Content on Hover/Focus (AA): tooltips/popovers must be dismissible, hoverable, persistent — WCAG 1.4.13
• Reflow (AA): no horizontal scrolling at 320px CSS width — WCAG 1.4.10
• Text Spacing (AA): layout survives user text-spacing overrides — WCAG 1.4.12

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Testing Accessibility

See testing-a11y.md for:

• Browser DevTools accessibility tree inspection (zero setup)
• Playwright + @axe-core/playwright automated audits (recommended for CI)
• Vitest + vitest-axe component-level unit tests
• Screen reader test matrix — NVDA · JAWS · VoiceOver · TalkBack · Narrator with browser pairings
• CI/CD GitHub Actions — automated axe scan on every PR
• VPAT / accessibility statement guidance for enterprise reporting
• Manual test checklist organized by POUR principle

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WCAG 2.2 AA Compliance Checklist

Use this checklist for every new component or page before merge. Each item maps to a WCAG 2.2 success criterion.

Perceivable

• 1.1.1 A — Every <img> has meaningful alt; decorative images use alt="" and aria-hidden="true"
• 1.3.1 A — Semantic HTML used for structure (headings, lists, tables); data relationships programmatically defined
• 1.3.2 A — DOM reading order matches visual presentation order
• 1.3.3 A — Instructions don't rely solely on shape, color, size, or spatial position
• 1.3.4 AA — Content works in both portrait and landscape orientation
• 1.3.5 AA — User data input fields have correct autocomplete attribute values
• 1.4.1 A — Color is not the only means of conveying information, indicating an action, or distinguishing an element
• 1.4.3 AA — Text and images of text meet 4.5:1 contrast ratio (3:1 for large text)
• 1.4.4 AA — Text resizes to 200% without loss of content or functionality
• 1.4.5 AA — Images of text not used where styled text could achieve the same visual effect (except logos)
• 1.4.10 AA — Content reflows at 320px CSS width without requiring horizontal scrolling
• 1.4.11 AA — UI component boundaries (input borders, button outlines, focus indicators) meet 3:1 non-text contrast
• 1.4.12 AA — Layout and content survive user text-spacing overrides (line-height 1.5×, letter-spacing 0.12em, word-spacing 0.16em)
• 1.4.13 AA — Hover/focus-triggered popovers and tooltips are dismissible (Escape), hoverable (pointer can move over them), and persistent until explicitly dismissed

Operable

• 2.1.1 A — All functionality is operable by keyboard; no functionality requires specific timing or a path-dependent gesture
• 2.1.2 A — No keyboard trap — user can always Tab away from any focused component
• 2.4.1 A — A skip link is provided to bypass repeated navigation blocks
• 2.4.2 A — Every page/view has a unique, descriptive document.title that updates on route change
• 2.4.3 A — Focus order follows a logical sequence that matches reading order
• 2.4.4 A — Link text (or link + context) describes the link's purpose clearly
• 2.4.6 AA — Headings and labels describe their topic or purpose
• 2.4.7 AA — A visible keyboard focus indicator is present on all keyboard-operable elements
• 2.4.11 AA — When a component receives focus, it is not entirely hidden behind sticky/fixed UI (cookie banners, sticky headers, toolbars)
• 2.5.1 AA — Multi-touch gestures (pinch, swipe) have a single-pointer alternative (tap, button)
• 2.5.2 AA — Click/tap functionality activates on pointer-up, not pointer-down; or up-event abort is available
• 2.5.3 AA — The accessible name of interactive elements contains the visible label text
• 2.5.7 AA — Drag interactions have a single-pointer (click/tap) alternative mechanism
• 2.5.8 AA — Interactive targets are at least 24×24 CSS pixels (with spacing exceptions for inline text)

Understandable

• 3.1.1 A — Page language declared: <html lang="en"> (or appropriate BCP-47 language code)
• 3.2.1 A — Receiving focus does not trigger unexpected context changes (form submit, page navigation)
• 3.2.2 A — Changing an input setting does not auto-submit or change context without prior user notice
• 3.2.3 AA — Navigation components (nav bars, breadcrumbs, sidebars) are consistent across pages
• 3.2.4 AA — Components with the same function are labeled consistently across the site
• 3.2.6 A — Help mechanisms (contact link, chat, FAQ) appear in the same relative position across pages
• 3.3.1 A — Errors are automatically detected, the erroneous item identified, and the error described in text
• 3.3.2 A — Labels or instructions are provided for all form inputs before or alongside them
• 3.3.3 AA — Error correction suggestions are provided when an input error is detected and suggestions are known
• 3.3.4 AA — Legal, financial, or data-destructive submissions are reversible, checkable, or confirmable
• 3.3.7 A — Previously entered information is auto-populated or selectable in the same process/session
• 3.3.8 AA — Authentication does not require solving a puzzle, transcribing characters, or memorization unless a supported alternative or assistance mechanism exists (paste and password managers must work)

Robust

• 4.1.2 A — Every UI component has a programmatically determinable name, role, and value; states and properties are settable; changes are notified to assistive technologies
• 4.1.3 A — Status messages (save confirmations, error counts, progress updates, loading complete) are conveyed to screen readers via live regions or role="status" without moving focus

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AAA Aspirational

These exceed the required AA level. Implement where feasible to provide a superior experience.

SC	Title	Implementation Guidance
1.4.6	Contrast Enhanced	Normal text 7:1 · Large text 4.5:1
2.3.3	Animation from Interactions	Motion triggered by interaction can be disabled by the user — see reduced-motion.md
2.4.12	Focus Not Obscured (Enhanced)	Focused element not obscured at all — increase scroll-margin-top to fully clear sticky UI
2.4.13	Focus Appearance	Focus indicator ≥ 2px perimeter, 3:1 contrast between focused and unfocused states
2.5.5	Target Size Enhanced	Interactive targets ≥ 44×44 CSS pixels — use min-h-[44px] min-w-[44px]
2.5.6	Concurrent Input Mechanisms	Do not restrict the user to a single input modality (e.g., do not disable mouse when touch is detected)
3.1.5	Reading Level	If content exceeds lower secondary school reading level, provide supplemental simpler version
3.3.9	Accessible Auth Enhanced	No cognitive function test (including CAPTCHA with alternatives) in any auth step

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Platform Notes

Platform	Metadata	Shell commands	Packaging
Claude Code	YAML frontmatter in SKILL.md	✅ Full !command`` support	n/a
Cowork	skills-rules.json (see skills-rules.json in this skill)	✅	.skill file via python -m scripts.package_skill skills/accessibility; use present_files to deliver packaged results
Claude.ai	Paste SKILL.md body into Project instructions; attach reference files as knowledge	❌ No shell commands	n/a

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Resources

Resource	URL
WCAG 2.2 Specification	https://www.w3.org/TR/WCAG22/
WCAG 2.2 Quick Reference	https://www.w3.org/WAI/WCAG22/quickref/
Understanding WCAG 2.2	https://www.w3.org/WAI/WCAG22/Understanding/
What's New in WCAG 2.2	https://www.w3.org/WAI/standards-guidelines/wcag/new-in-22/
ARIA Authoring Practices Guide (APG)	https://www.w3.org/WAI/ARIA/apg/
WebAIM Contrast Checker	https://webaim.org/resources/contrastchecker/
APCA Contrast Calculator	https://apcacontrast.com/
axe DevTools Browser Extension	https://www.deque.com/axe/browser-extensions/
WAVE Evaluation Tool	https://wave.webaim.org/
NVDA Screen Reader (free, Windows)	https://www.nvaccess.org/
Deque University — free courses	https://dequeuniversity.com/
Inclusive Components — patterns	https://inclusive-components.design/