Lighthouse — Complete Guide
Lighthouse — Complete Guide: free step-by-step lesson with examples, common mistakes, and interview tips — part of HTML Tutorial on Toolliyo Academy.
On this page
HTML Tutorial · Lesson 84 of 100
Lighthouse
Basics ✓ → Forms & semantics ✓ → APIs & performance ✓ → Projects
Projects · 4 — MarkupVerse builds · ~10 min · HTML — Testing & Deployment
What is this?
Lighthouse audits performance, accessibility, SEO, and best practices in Chrome DevTools.
Why should you care?
MarkupVerse uses Lighthouse scores as a gate before shipping customer-facing HTML.
See it live — copy this example
Save as demo.html and open in your browser, or use Run Example below.
<!-- Run Lighthouse on this minimal landing shell -->
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1">
<meta name="description" content="MarkupVerse job board for tech hires.">
<title>MarkupVerse Careers</title>
</head>
<body>
<main><h1>Open roles at MarkupVerse</h1></main>
</body>
</html>Run Example »
Edit the code below and click Run to see the result in Toolliyo’s live editor.
What happened?
- Fix P0 issues first: missing meta description, contrast, tap targets.
- Run mobile + desktop modes.
Practice next
- Open DevTools Lighthouse tab.
- Run mobile audit.
- Fix top three issues.
- Add CI Lighthouse action.
- Compare scores on PR comments.
Remember
Audit mobile first. Fix meta + contrast. Re-run after changes.
MarkupVerse Lighthouse gate
Careers page scores 62 accessibility.
Outcome: Team adds labels and hits 95 before deploy.
Interview prep for this lesson
Practice these questions aloud after reading—each links to a full structured answer.
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