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Uday Janardhan Singh 2025-12-02 16:22:28 +01:00 committed by GitHub
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packages/quiz/questions/what-does-a-doctype-do/en-US.mdx
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@ -9,3 +9,18 @@ A DTD defines how documents of a certain type should be structured (i.e. a `butt
For webpages, the DOCTYPE declaration is required. It is used to tell user agents what version of the HTML specifications your document respects. Once a user agent has recognized a correct DOCTYPE, it will trigger the **no-quirks mode** matching this DOCTYPE for reading the document. If a user agent doesn't recognize a correct DOCTYPE, it will trigger the **quirks mode**.
The DOCTYPE declaration for the HTML5 standards is `<!DOCTYPE html>`.
Why It Matters:
Without DOCTYPE:
Box model calculations differ
CSS rendering inconsistencies
JavaScript behavior variations
Layout problems across browsers
With Proper DOCTYPE:
Predictable CSS box model
Consistent rendering
Modern HTML5 features work properly
Better cross-browser compatibility