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.
Featured articles
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Web APIs CSS Custom Highlight API
The CSS Custom Highlight API provides a mechanism for styling arbitrary text ranges on a document by using JavaScript to create the ranges, and CSS to style them.
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Web APIs Server timing
Server-Timing is a part of the Performance API and allows servers to communicate metrics about the request-response cycle to the user agent. You can collect this information and act on server-side metrics in the same way as all the other metrics processed with the Performance API.
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JavaScript JavaScript resource management
This guide talks about how to do resource management in JavaScript. Resource management is not exactly the same as memory management, which is a more advanced topic and usually handled automatically by JavaScript. Resource management is about managing resources that are not automatically cleaned up by JavaScript. Sometimes, it's okay to have some unused objects in memory, because they don't interfere with application logic, but resource leaks often lead to things not working, or a lot of excess memory usage. Therefore, this is not an optional feature about optimization, but a core feature to write correct programs!
Latest news
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developer.mozilla.org Under the hood of MDN's new frontend
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.
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developer.mozilla.org Image formats: Codecs and compression tools
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.
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developer.mozilla.org A beginner-friendly guide to view transitions in CSS
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.
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developer.mozilla.org Launching MDN's new front end
MDN is getting a facelift 🎉. Discover what's changed, what's improved, and how navigating the site just got smoother.
Recent contributions
Contributor Spotlight
Shrinivass Arunachalam BalasubramanianMDN 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
