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HTML/CSSIntermediate#html#doctype#rendering

What is quirks mode vs standards mode?

Standards mode renders pages according to W3C specifications, triggered by a valid DOCTYPE. Quirks mode emulates non-standard behavior of old browsers (like Netscape/IE), causing inconsistent box-model and CSS handling, triggered by a missing or malformed DOCTYPE.

Example
<!-- Missing DOCTYPE triggers quirks mode -->
<html><body>Content</body></html>

<!-- Correct: standards mode -->
<!DOCTYPE html>
<html><body>Content</body></html>

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