By Genesis AI Services · April 21, 2026 · 8 min read · Testing

How to Test Website Accessibility

Key insight: No single testing method finds everything. Automated tools catch ~30–40% of issues. Keyboard testing catches more. Screen reader testing catches the rest. All three together give you the most complete picture.

A proper accessibility testing program has four layers. Each layer catches different issues. Skipping any layer leaves gaps that can generate complaints, lawsuits, or simply leave real users unable to use your site.

The Four Testing Layers

Layer 1 — Automated Scanning (~30 min)

Run an automated tool against your key pages. Catches: missing alt text, contrast failures, missing form labels, invalid ARIA, missing page title, skip link issues, structural violations.

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Does NOT catch: meaningful vs. meaningless alt text, logical reading order, confusing UX, dynamic content issues triggered by interaction.

Layer 2 — Keyboard Testing (~1 hour)

Navigate your entire site using only Tab, Shift+Tab, Enter, Space, Escape, and arrow keys. Catches: focus traps, invisible focus, unreachable interactive elements, wrong tab order, broken dropdowns/modals.

Layer 3 — Screen Reader Testing (~2 hours)

Use NVDA + Chrome (Windows) and/or VoiceOver + Safari (macOS). Catches: poor alt text, confusing link text, missing headings, form label issues, live region problems, broken ARIA patterns.

Layer 4 — User Testing (ongoing)

Test with actual disabled users. Catches: usability issues that technical tests miss, cognitive barriers, confusing navigation patterns, real-world AT compatibility problems.

What Each Tool Catches

Issue Type	Automated	Keyboard	Screen Reader
Missing alt text	✓ (finds missing)	—	✓ (finds bad quality)
Color contrast	✓	—	—
Form label missing	✓	—	✓
Keyboard trap	—	✓	✓
Focus ring hidden	Partial	✓	—
Tab order wrong	—	✓	✓
Skip link missing	✓	✓	—
Heading structure	✓	—	✓
Confusing link text	Partial	—	✓
Dynamic content	—	—	✓
Modal focus mgmt	—	✓	✓
ARIA misuse	Partial	—	✓
HTML validity	✓	—	—

Which Pages to Test

You cannot test every page — focus on pages that represent all unique templates and high-traffic user flows:

Homepage
Primary navigation
Contact or sign-up form
Checkout or payment flow
Search results page
Content/article template
Login and password reset
Account settings
Error pages (404, server error)

Prioritizing Fixes

Not all issues are equal. Prioritize by:

Impact — does it prevent task completion? (form can't be submitted, page can't be navigated)
Reach — how many users hit it? (every page vs one obscure form)
WCAG level — Level A violations are more severe than AA
Ease of fix — a CSS change vs a rebuild

A common mistake is fixing everything top-to-bottom in the audit report order. Start with anything that completely blocks access (keyboard traps, forms with no labels, essential images with no alt text).

Testing in CI/CD

Integrate automated accessibility testing into your build pipeline so regressions are caught before deployment:

// Example: axe-core with Jest + Testing Library
import { axe, toHaveNoViolations } from 'jest-axe';
expect.extend(toHaveNoViolations);

test('accessibility: login form', async () => {
  const { container } = render(<LoginForm />);
  const results = await axe(container);
  expect(results).toHaveNoViolations();
});

Start Your Accessibility Test — Free

Accessalyze handles Layer 1 (automated scanning) for any URL in 30 seconds. It's your fastest path to a baseline audit.

Start Free Accessibility Audit →

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