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Browser Modes with Doctype

Explore how browsers use DOCTYPE to switch between quirks mode, almost standards mode, and full standards mode. Understand the importance of placing DOCTYPE correctly to ensure your HTML page renders with modern CSS standards and avoid legacy quirks.

Older versions of several web browsers did not conform to the web standards for CSS. Authors created web pages that used several browser-specific quirks to render pages the way they intended. To render the websites created using these quirks, modern web browsers implement several rendering modes, including a quirks mode.

Quirks vs. standards mode

The layout engines in web browsers have three modes: quirks mode, ...