HTML HOME

Welcome

This is not a beginner tag tutorial. HTML is the contract between your product, the browser rendering engine, Google Search, assistive technology, and your security boundary. Every lesson teaches engineering judgment — browser internals, Core Web Vitals, WCAG architecture, SEO markup, XSS surfaces, and how Shopify, Google, Stripe, Airbnb, and the BBC ship HTML in production.

Engineering-grade HTML

Each lesson includes fourteen sections used in frontend architecture reviews:

• Business problem — why markup choices affect revenue and compliance
• Why this feature exists — platform history and rejected alternatives
• Browser internals — parser, DOM, compositor behavior
• Rendering workflow — critical path from bytes to pixels
• Accessibility, SEO, security, performance — analyzed together, not as afterthoughts
• Production examples, enterprise usage, common failures
• Architecture review questions, hands-on project, interview questions

Course modules

• HTML Tutorial, Forms, Graphics, Media, APIs — every original lesson upgraded
• Browser Rendering Engine — tokenization, DOM, CRP, compositor layers
• Core Web Vitals — LCP, INP, CLS, RUM/CrUX, performance budgets
• Advanced SEO Engineering — canonical, JSON-LD, hreflang, audits
• Accessibility Engineering — WCAG, ARIA architecture, screen readers
• Frontend Security — XSS, CSRF, CSP, sanitization
• Modern Frontend Architecture — islands, MFE shell, SSR hydration
• Enterprise Frontend Systems — CMS, i18n, email HTML, regulated markup
• Production Case Studies — Google, Shopify, Airbnb, Stripe, BBC

How senior engineers use this course

Read the business problem and sketch your own solution before the hands-on project. Run Lighthouse and axe on every project deliverable. Treat the architecture review questions as your PR checklist. Mark lessons complete to track progress across 139 engineering lessons.