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mdn web docs skip to main content skip to search mdn html html markup language html reference elements global attributes attributes see all html guides responsive images html cheatsheet date time formats see all markup languages svg mathml xml css css styling language css reference properties selectors at rules values see all css guides box model animations flexbox colors see all layout cookbook column layouts centering an element card component see all javascript js javascript scripting language js reference standard built in objects expressions operators statements declarations functions see all js guides control flow error handling loops and iteration working with objects using classes see all web apis web apis programming interfaces web api reference file system api fetch api geolocation api html dom api push api service worker api see all web api guides using the web animation api using the fetch api working with the history api using the web speech api using web workers all all web technology technologies accessibility http uri web extensions webassembly webdriver see all topics media performance privacy security progressive web apps learn learn web development frontend developer course getting started modules core modules mdn curriculum check out the video course from scrimba our partner learn html structuring content with html module learn css css styling basics module css layout module learn javascript dynamic scripting with javascript module tools discover our tools playground http observatory border image generator border radius generator box shadow generator color format converter color mixer shape generator about get to know mdn better about mdn advertise with us community mdn on github blog mdn theme os default light dark english us remember language learn more deutsch english us español français 日本語 한국어 português do brasil русский 中文 简体 正體中文 繁體 resources for developers by developers documenting css html and javascript since 2005 search mandala featured articles blog celebrating 20 years of mdn mdn turns 20 let s look at how we started how mdn became the most trusted resource for web developers the impact it s had on the open web and yes there s cake too web apis navigation api the navigation api provides the ability to initiate intercept and manage browser navigation actions it can also examine an application s history entries this is a successor to previous web platform features such as the history api and window location which solves their shortcomings and is specifically aimed at the needs of single page applications spas web apis trusted types api the trusted types api gives web developers a way to ensure that input has been passed through a user specified transformation function before being passed to an api that might execute that input this can help to protect against client side cross site scripting xss attacks most commonly the transformation function sanitizes the input css using css anchor positioning the css anchor positioning module defines features that allow you to tether elements together elements can be defined as anchor elements and anchor positioned elements anchor positioned elements can be bound to anchor elements the anchor positioned elements can then have their size and position set relative to the size and location of the anchor elements to which they are bound latest news developer mozilla org introducing the mdn mcp server 4 months ago mdn s mcp server brings mdn s documentation and browser compatibility data directly into your editor or ide giving your llm or coding agent access to accurate up to date web platform information developer mozilla org under the hood of mdn s new frontend 7 months ago you may have spotted that mdn has a new frontend there s plenty happening under the surface so let s unpack the technologies we chose the architectural decisions we made and why we did a rebuild at all developer mozilla org image formats codecs and compression tools 12 months ago image compression involves countless trade offs between quality size and speed in this final part of the series we experiment with codecs metrics and tools to find practical ways to balance efficiency and visual fidelity developer mozilla org a beginner friendly guide to view transitions in css 1 year ago learn how to bring smooth animated navigation to multi page apps with view transitions with just one line of css you can enable seamless transitions between pages recent contributions mdn content 4 hours ago fix many problems with audio api params mdn content 4 hours ago adjust preference range for want content digest header mdn content 3 hours ago explanation improved on the results of isfinite and isnan mdn content 2 hours ago webextensions add user agent to the list of dnr append headers mdn content 1 hour ago document style in body as first child with scope contributor spotlight shrinivass arunachalam balasubramanian mdn closely follows w3c standards which helps me keep up with important topics it s a complete package as it caters to everything complex apis new browser functionalities and best practices mdn serves as a truly valuable resource and continues to assist me in my everyday development get involved mdn your blueprint for a better internet mdn about blog mozilla careers advertise with us mdn plus product help contribute mdn community community resources writing guidelines mdn discord mdn on github developers web technologies learn web development guides tutorials glossary hacks blog mozilla website privacy notice telemetry settings legal community participation guidelines portions of this content are 1998 2026 by individual mozilla org contributors content available under a creative commons license