HTML Foundations: Your First Page, Document Anatomy & Browser Parsing
Start with a complete page you can open in your browser, then learn what the DOCTYPE, DOM, encoding, and script loading actually do.
No prior experience. A browser and a text editor are enough. Start with the first lesson; the later lessons go under the hood and can be revisited.
Build your first complete page, then understand <!DOCTYPE html> standards mode, character encoding, the critical rendering path, and asynchronous script loading.
Read in order, or jump to what you need.
Every lesson builds on the one before it. Open any lesson to read the explanation, run the examples, and try the practice challenges.
- 01.01Start Here: Build Your First Web Page4 min
A gentle, hands-on introduction to HTML: what it is, how tags work, and how to create a complete page you can open in your browser in the next five minutes.
- 01.02The HTML5 DOCTYPE, Standards Mode, and Browser Rendering Modes4 min
Explore the historical origins and technical mechanics of <!DOCTYPE html>, browser rendering modes (Standards Mode vs Quirks Mode), and HTML5 error-tolerance parsing rules.
- 01.03DOM Tree Construction, CSSOM, and the Critical Rendering Path4 min
Analyze how browser engines turn HTML bytes into pixels: Tokenization, DOM Tree Construction, CSSOM generation, Render Tree synthesis, Layout (Reflow), and Paint.
- 01.04Character Encoding (UTF-8), Meta Viewport, and Document Metadata4 min
Master document header metadata: UTF-8 character encoding declarations within the first 1024 bytes, responsive meta viewport settings, and favicon configurations.
- 01.05Script Loading Strategies: Synchronous, Async, Defer, and ES Modules4 min
Master modern script loading mechanics: parser-blocking scripts, asynchronous execution (async), deferred execution (defer), and native ES Modules (type='module').
Ready to move on?
Build a valid HTML5 page with UTF-8, a responsive viewport, and a deferred script that passes W3C validation.
Open the module self-check