What HTML Is and How the Web Uses It
Learning Focus
HTML is the document layer of the web. CSS and JavaScript work best when that structure is clean and meaningful.
What HTML Does
HTML describes the structure and meaning of content.
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The browser parses that markup into a document tree, then applies CSS and JavaScript on top.
Why It Matters
| Concern | HTML's Role |
|---|---|
| Accessibility | Gives assistive tech meaningful structure |
| SEO | Helps search engines understand content |
| Styling | Provides stable hooks for CSS |
| Behavior | Provides stable hooks for JavaScript |
Common Pitfalls
- Treating HTML as a visual layout tool only
- Using generic containers where semantic tags fit better
- Forgetting that invalid markup can break page behavior in subtle ways