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Documenting web technologies, including CSS, HTML, and JavaScript, since 2005.
Featured articles
New reference pages on MDN for JavaScript regular expressions
See the latest updates to the MDN reference pages about JavaScript regular expressions, including new sections on sub-features and browser compatibility information.
Using HTML landmark roles to improve accessibility
Learn what HTML landmark roles are, how they improve accessibility, and how you can include them on your website effectively.
Web APIs
Performance APIs
The Performance API is a group of standards used to measure the performance of web applications.
CSS CSS nesting
The CSS nesting module defines a syntax for nesting selectors, providing the ability to nest one style rule inside another, with the selector of the child rule relative to the selector of the parent rule.
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Recent contributions
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Remove mention of CSSOMString mdn/content
a day ago
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Fix self-links of `enterpictureinpicture` event mdn/content
a day ago
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Indicate the geographical reference system mdn/content
a day ago
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Clarify `mouseleave` semantics on DOM removal mdn/content
a day ago
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feat(wasm): Upgrade WASM node tutorial to use node 20 mdn/content
a day ago
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zh-cn: common-types add apng and translation mdn/translated-content
2 day ago
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[KO]: ARIA states and properties 문서 번역 mdn/translated-content
2 day ago
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zh-cn: update the translation of DataTransferItem.{kind, type} mdn/translated-content
2 day ago
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[zh-cn] sync translated content mdn/translated-content
2 day ago
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[es] sync translated content mdn/translated-content
2 day ago
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