Accessibility Testing

SkillDev tools

axe-core integration, WCAG 2.2 AA checklist, keyboard navigation testing, screen reader testing, and ARIA pattern validation.

Available today. Use it from your connected AI after setup.

No other account needed.

Connect ahel once, and every AI you use reads what you have installed.

Then ask your AI: use the Accessibility Testing skill

What this skill tells your AI

The instructions your AI receives, as published by vibeeval/vibecosystem in skills/accessibility-testing/SKILL.md and read by ahel’s review.

axe-core Setup

jest-axe (unit / component tests)

import { axe, toHaveNoViolations } from 'jest-axe'
import { render } from '@testing-library/react'
expect.extend(toHaveNoViolations)

test('LoginForm has no a11y violations', async () => {
  const { container } = render(<LoginForm />)
  const results = await axe(container)
  expect(results).toHaveNoViolations()
})

playwright-axe (e2e)

import { test, expect } from '@playwright/test'
import AxeBuilder from '@axe-core/playwright'

test('homepage passes axe audit', async ({ page }) => {
  await page.goto('/')
  const results = await new AxeBuilder({ page })
    .withTags(['wcag2a', 'wcag2aa', 'wcag21aa'])
    .analyze()
  expect(results.violations).toEqual([])
})

cypress-axe

// cypress/support/e2e.js
import 'cypress-axe'

// in test
cy.visit('/')
cy.injectAxe()
cy.checkA11y(null, {
  runOnly: { type: 'tag', values: ['wcag2aa'] },
})

WCAG 2.2 AA Checklist — Top 20 Violations

#	Criterion	Check
1	Images have alt text	`<img alt="description">` or `alt=""` for decorative
2	Form inputs have labels	`<label for>` or `aria-label` or `aria-labelledby`
3	Color contrast ≥ 4.5:1	Normal text; 3:1 for large text (18pt or 14pt bold)
4	Heading hierarchy	h1 → h2 → h3, no skipping levels
5	Keyboard focusable	All interactive elements reachable via Tab
6	Focus visible	`:focus` outline never `outline: none` without replacement
7	No keyboard trap	Tab can always exit modals, dropdowns, widgets
8	Skip navigation link	First focusable element: "Skip to main content"
9	Page has `<title>`	Unique, descriptive per page
10	Language attribute	`<html lang="en">`
11	Error identification	Form errors are text, not color-only
12	Error suggestions	Tell users how to fix the error
13	Link purpose clear	No "click here" or "read more" without context
14	Button text	No icon-only buttons without `aria-label`
15	Table headers	`<th scope="col
16	No seizure content	No flashing > 3 times/sec
17	Status messages	`role="status"` or `aria-live` for dynamic updates
18	Reflow at 400% zoom	Single column, no horizontal scroll
19	Text spacing adjustable	No overflow when line-height/letter-spacing increased
20	Timeout warning	Warn before session expires, allow extension

Keyboard Navigation Test Patterns

Tab order verification

test('modal tab order is correct', async ({ page }) => {
  await page.click('[data-testid="open-modal"]')

  // First focus should be the modal's close button or heading
  await expect(page.locator('[aria-label="Close dialog"]')).toBeFocused()

  // Tab through: close → input → submit
  await page.keyboard.press('Tab')
  await expect(page.locator('#email-input')).toBeFocused()

  await page.keyboard.press('Tab')
  await expect(page.locator('[type="submit"]')).toBeFocused()

  // Wrap back to close button (focus trap)
  await page.keyboard.press('Tab')
  await expect(page.locator('[aria-label="Close dialog"]')).toBeFocused()
})

Focus trap in modals

// Escape should close
await page.keyboard.press('Escape')
await expect(page.locator('[role="dialog"]')).not.toBeVisible()

// Focus returns to trigger element after close
await expect(page.locator('[data-testid="open-modal"]')).toBeFocused()

Skip navigation link

test('skip link goes to main content', async ({ page }) => {
  await page.goto('/')
  await page.keyboard.press('Tab')   // first tab = skip link

  const skipLink = page.locator('a:has-text("Skip to")')
  await expect(skipLink).toBeFocused()

  await page.keyboard.press('Enter')
  await expect(page.locator('main, #main-content')).toBeFocused()
})

Arrow key navigation (listbox/menu)

test('dropdown menu responds to arrow keys', async ({ page }) => {
  await page.click('[aria-haspopup="listbox"]')
  await page.keyboard.press('ArrowDown')  // first option focused
  await page.keyboard.press('ArrowDown')  // second option
  await page.keyboard.press('Enter')      // select

  // Verify selection
  await expect(page.locator('[aria-selected="true"]')).toContainText('Option 2')
})

ARIA Patterns

Live regions (dynamic announcements)

<!-- For important real-time updates (errors, confirmations) -->
<div role="alert">Your payment failed. Please try again.</div>

<!-- For polite updates (search results count) -->
<div aria-live="polite" aria-atomic="true">
  Showing 42 results for "laptop"
</div>

<!-- Screen reader only text (visually hidden) -->
<style>
  .sr-only {
    position: absolute; width: 1px; height: 1px;
    padding: 0; margin: -1px; overflow: hidden;
    clip: rect(0,0,0,0); white-space: nowrap; border: 0;
  }
</style>

Dialog / Modal

<div role="dialog"
     aria-modal="true"
     aria-labelledby="dialog-title"
     aria-describedby="dialog-desc">
  <h2 id="dialog-title">Confirm Delete</h2>
  <p id="dialog-desc">This action cannot be undone.</p>
  <button>Cancel</button>
  <button>Delete</button>
</div>

Tabs

<div role="tablist" aria-label="Account settings">
  <button role="tab" aria-selected="true"  aria-controls="panel-profile" id="tab-profile">Profile</button>
  <button role="tab" aria-selected="false" aria-controls="panel-billing" id="tab-billing" tabindex="-1">Billing</button>
</div>
<div role="tabpanel" id="panel-profile" aria-labelledby="tab-profile">...</div>
<div role="tabpanel" id="panel-billing" aria-labelledby="tab-billing" hidden>...</div>

Combobox / Autocomplete

<label for="search">Search users</label>
<input type="text"
       id="search"
       role="combobox"
       aria-autocomplete="list"
       aria-expanded="true"
       aria-controls="search-listbox"
       aria-activedescendant="opt-2" />
<ul id="search-listbox" role="listbox">
  <li role="option" id="opt-1">Alice</li>
  <li role="option" id="opt-2" aria-selected="true">Bob</li>
</ul>

Color Contrast Requirements

Text Size	Minimum Ratio	Enhanced (AAA)
Normal text (< 18pt / < 14pt bold)	4.5:1	7:1
Large text (≥ 18pt or ≥ 14pt bold)	3:1	4.5:1
UI components / icons	3:1	—
Decorative / disabled	No requirement	—

Test tools: WebAIM Contrast Checker, Figma A11y Plugin, Chrome DevTools CSS Overview.

VoiceOver Quick Reference (macOS)

Action	Shortcut
Start / Stop VoiceOver	Cmd + F5
Read next item	VO + Right Arrow
Read page from top	VO + A
Navigate headings	VO + Cmd + H
Navigate links	VO + Cmd + L
Navigate form controls	VO + Cmd + J
Open Web Rotor	VO + U

VO = Control + Option

Common Violations and Fixes

<!-- VIOLATION: Missing alt -->
<img src="logo.png" />
<!-- FIX -->
<img src="logo.png" alt="Acme Corp logo" />
<!-- Decorative: -->
<img src="divider.png" alt="" role="presentation" />

<!-- VIOLATION: Icon button with no label -->
<button><svg>...</svg></button>
<!-- FIX -->
<button aria-label="Close dialog"><svg aria-hidden="true">...</svg></button>

<!-- VIOLATION: Placeholder as label -->
<input placeholder="Email address" />
<!-- FIX -->
<label for="email">Email address</label>
<input id="email" type="email" placeholder="you@example.com" />

<!-- VIOLATION: Color-only error -->
<input style="border: 2px solid red" />
<!-- FIX -->
<input aria-invalid="true" aria-describedby="email-error" />
<span id="email-error" role="alert">Email is required</span>

CI Integration (axe-core in GitHub Actions)

# .github/workflows/a11y.yml
name: Accessibility Tests
on: [pull_request]

jobs:
  a11y:
    runs-on: ubuntu-latest
    steps:
      - uses: actions/checkout@v4
      - uses: actions/setup-node@v4
        with: { node-version: '20' }
      - run: npm ci
      - run: npx playwright install --with-deps chromium
      - run: npm run test:a11y
      - uses: actions/upload-artifact@v4
        if: failure()
        with:
          name: a11y-report
          path: playwright-report/

Signals

GitHub stars: 530
Forks: 44
Last commit: Aug 2026

Advanced

Catalog kind: skill
Gateway key: accessibility-testing-vibeeval
Source: github.com/vibeeval/vibecosystem

github.com/vibeeval/vibecosystem

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