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Audit and fix accessibility in Core UI. Use when changing or reviewing buttons, links, forms, validation, dialogs, menus, tabs, tables, keyboard interactions, focus management, accessible names, announcements, contrast, touch targets, reduced motion, or WCAG/a11y behavior.
Accessibility review
Apply a focused accessibility pass without replacing Core's component system or
mistaking automated checks for conformance.
Authority and boundaries
Read docs/ai/rules/frontend.md and docs/ai/rules/testing.md first.
Reuse @asym/ui Base UI primitives for dialogs, menus, tabs, tooltips,
comboboxes, and other behavior-heavy widgets. Do not build ARIA replicas of
behavior that a shared primitive already implements.
Prefer native HTML semantics before adding roles or ARIA. ARIA supplements
semantics; it does not repair incorrect interaction behavior.
Use docs/ai/skills/components-build/SKILL.md for component API work and
docs/ai/skills/emil-design-engineering/touch-accessibility.md for Core's
touch and keyboard conventions.
Keep fixes scoped. Do not migrate UI libraries or refactor unrelated layout.
Workflow
Map the states. Identify the interactive controls, reading order,
keyboard path, loading/empty/error states, responsive variants, and any
content revealed only by hover or pointer input.
Check semantics and names. Verify landmarks, headings, lists, table
headers, labels, accessible names, descriptions, values, and state attributes.
Exercise interaction. Use Tab and Shift+Tab, Enter/Space, arrow keys where
the widget pattern requires them, and Escape for dismissible overlays. Check
visible focus, initial focus, focus containment, and focus restoration.
Check feedback. Associate helper and error text with fields, announce
material async status changes, and ensure color, toast, or hover is never the
only carrier of essential information.
Check perception. Inspect contrast, zoom/reflow, touch targets, alt text,
captions where applicable, and reduced-motion behavior. Preserve Core's
global reduced-motion baseline instead of redeclaring it in an app.
Verify proportionately. Run the focused automated suite, then perform the
manual checks automation cannot prove. If asked only to review, report exact
file:line evidence and concrete fixes without editing source.
Core patterns
Give every interactive control an accessible name. Label icon-only buttons;
keep decorative icons out of the accessibility tree.
Use real button, a, label, fieldset, legend, th, ul/ol, and
heading elements when they express the behavior.
Connect field help and errors with stable IDs and aria-describedby; set
aria-invalid only when the field is invalid.
Expose expanded, selected, checked, pressed, busy, and current state through
the native element or the applicable ARIA state.
Keep DOM order aligned with visual and keyboard order. Never use positive
tabIndex to repair a broken sequence.
Use Core's touch-target tokens and shared controls instead of shrinking the
hit area to match the visible glyph.
Verification
bun run test:a11y
For new or materially changed routes, update
tests/e2e/accessibility.spec.ts. Use @axe-core/playwright for repeatable
violations and Playwright role locators for behavior. An axe pass does not prove
keyboard order, focus quality, usable labels, alt-text intent, or complete WCAG
conformance, so keep the manual interaction pass.
Checklist
Native semantics or an established Base UI primitive owns behavior.
Names, descriptions, relationships, values, and states are exposed.
Keyboard operation, focus visibility, containment, and restoration work.
Forms expose instructions and errors without relying on color or toast.
Contrast, zoom/reflow, touch, media, and reduced motion were considered.
Relevant automated and manual checks ran; remaining limits are stated.
Findings cite exact files/lines, or fixes remain minimal and targeted.
Provenance
See references/upstream.md for the reviewed upstream
source, license, Core adaptations, and refresh workflow.
