Accessibility Testing — Complete Guide
Accessibility Testing — Complete Guide: free step-by-step lesson with examples, common mistakes, and interview tips — part of HTML Tutorial on Toolliyo Academy.
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HTML Tutorial · Lesson 82 of 100
Accessibility Testing
Basics ✓ → Forms & semantics ✓ → APIs & performance ✓ → Projects
Projects · 4 — MarkupVerse builds · ~10 min · HTML — Testing & Deployment
What is this?
Accessibility testing finds barriers for keyboard and screen reader users beyond automated scans.
Why should you care?
MarkupVerse banking flows must pass tab order and live region announcements.
See it live — copy this example
Save as demo.html and open in your browser, or use Run Example below.
<button type="button" id="otp-send" aria-describedby="otp-hint">Send OTP</button>
<p id="otp-hint">We text a 6-digit code to your registered mobile.</p>
<div role="status" aria-live="polite" id="otp-status"></div>
<script>
document.getElementById('otp-send').onclick = () => {
document.getElementById('otp-status').textContent = 'OTP sent at ' + new Date().toLocaleTimeString();
};
</script>
Run Example »
Edit the code below and click Run to see the result in Toolliyo’s live editor.
What happened?
- Tab to every control.
- aria-describedby links hint text.
- Live regions announce async updates.
Practice next
- Tab through OTP flow.
- Run axe or Lighthouse a11y.
- Verify live region announces.
- Test with NVDA/VoiceOver once.
- Add aria-busy during send.
Remember
Keyboard test manually. aria-describedby hints. Live regions for async.
MarkupVerse OTP a11y
SR user sends OTP on login.
Outcome: Status region announces OTP sent time.
Interview prep for this lesson
Practice these questions aloud after reading—each links to a full structured answer.
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