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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.
Performance API
The Performance API is a group of standards used to measure the performance of web applications.
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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Add frameAncestors to OnBeforeSendHeaders.detailsmdn/content
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3 hours agoadditions and standardizations for polygon() and path()mdn/content
4 hours ago[es] remove obsolete `orphaned/Web/HTML/Element/applet`mdn/translated-content
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