Lesson 82/100

Tutorials HTML Tutorial

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.

Code
Result

What happened?

  • Tab to every control.
  • aria-describedby links hint text.
  • Live regions announce async updates.

Practice next

  1. Tab through OTP flow.
  2. Run axe or Lighthouse a11y.
  3. Verify live region announces.
  4. Test with NVDA/VoiceOver once.
  5. 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.

Junior Detailed
Explain JavaScript in the context of HTML.
Short answer: JavaScript runs single-threaded with an event loop. Closures capture lexical scope; promises/async handle I/O without blocking the UI thread. Real-world example (ShopNest) On the ShopNest storefront UI, thi…
Mid Detailed
What are common mistakes teams make with Components when using HTML?
Short answer: Interviewers want a crisp definition, a practical example from your projects, and awareness of trade-offs—not textbook dumps. Explain a bit more How to structure your answer (60–90 seconds) Define Component…
Senior Detailed
How would you debug a production issue related to State in a HTML application?
Short answer: Interviewers want a crisp definition, a practical example from your projects, and awareness of trade-offs—not textbook dumps. Explain a bit more How to structure your answer (60–90 seconds) Define State in…
Junior Detailed
Describe a real-world scenario where Performance mattered in a HTML project.
Short answer: Interviewers want a crisp definition, a practical example from your projects, and awareness of trade-offs—not textbook dumps. Explain a bit more How to structure your answer (60–90 seconds) Define Performan…
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HTML Tutorial
Course syllabus

HTML Tutorial

HTML — Foundations
HTML — Media & Content
HTML — Forms & Validation
HTML — Semantic HTML & SEO
HTML — Accessibility & Responsive Design
HTML — HTML5 APIs & Advanced Features
HTML — with CSS & JavaScript
HTML — Performance & Security
HTML — Testing & Deployment
HTML — Real-World Projects
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