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The official MDN Web Docs account. We deliver the best web docs around.
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MDN is 20 years old! 🥳 🙏 A huge thank you to... The devs who read and trust MDN The contributors who improve it Everyone working on the web platform who shares our mission. Here's how we celebrated with the web.dev team! 🧁 developer.mozilla.org/en-US/blog/mdn…
Need cross-thread synchronization without freezing the main thread? 🥶 Atomics.waitAsync() returns immediately and resolves when another thread calls Atomics.notify(). Perfect for coordinating workers with SharedArrayBuffer. Learn more 👇 developer.mozilla.org/en-US/docs/Web…
Fine-tune multilingual typography with text-autospace ✨ It lets you control spacing between CJK and Latin characters. > text-autospace: ideograph-alpha ideograph-numeric punctuation; Now available on Baseline 2025. 🎉 Learn more 👇 developer.mozilla.org/en-US/docs/Web…
What's new in Firefox 145? 🦊 CSS: • text-autospace → better spacing across scripts • math font family → proper math rendering JS: • Atomics.waitAsync() → async synchronization on the main thread There's more! Read full release notes 👇 developer.mozilla.org/en-US/docs/Moz…
How do you use web security features, and what gets in your way? 💭 The W3C Security Web Application Guidelines Community Group wants your input to improve guidance for developers. Take the survey → docs.google.com/forms/d/1-8Dvg…
JavaScript's date object has been tricky for years, but that is changing. The NEW Temporal API brings, 🌍 Easily handle time zones 📆 Precise date math 🕒 Parse ISO strings without errors ⌛ Durations, date ranges, and more. Start experimenting 👇 developer.mozilla.org/en-US/docs/Web…
MDN is more than just a resource. It's a community of developers, contributors, and learners passionate about web development. Contribute to, 📚 MDN documentation 🤝 Help other devs 💟 Localize content 📝 Review or write on MDN Start now 👇 developer.mozilla.org/en-US/community
Which image format really gives you the best balance between speed, size, and quality? 🤔 In this hands-on MDN post, @pgurtovaya runs real compression experiments (AVIF vs. JPEG 🐿️) and breaks down how to pick the right codec for your workflow. developer.mozilla.org/en-US/blog/ima…
Part 3 of MDN’s Image formats series is here! 🖼️ We’ve covered color models & encoders. Now it’s time to compare real codecs and compression tools. Learn how to measure “image quality” the right way. Read more 👇 developer.mozilla.org/en-US/blog/ima…
More updates on Firefox 145 🦊 🎥 Matroska (.mkv) support for major codecs 🧠 Serializable RTCEncodedAudioFrame + RTCEncodedVideoFrame 🧩 WebDriver BiDi: new emulation.setUserAgentOverride & download events All updates 👇 developer.mozilla.org/en-US/docs/Moz…
How do you use web security features, and what gets in your way? 💭 The W3C Security Web Application Guidelines Community Group wants your input to improve guidance for developers. Take the survey → docs.google.com/forms/d/1-8Dvg…
🆕 The URL Pattern API is Newly Available! Use it to match and extract parts of URLs, no need to reinvent routing logic. Supports literals, wildcards, named groups, and even regex constraints. Learn how it works 👇 developer.mozilla.org/en-US/docs/Web…
What's new in Firefox 145? 🦊 CSS: • text-autospace → better spacing across scripts • math font family → proper math rendering JS: • Atomics.waitAsync() → async synchronization on the main thread There's more! Read full release notes 👇 developer.mozilla.org/en-US/docs/Moz…
Ever seen `__proto__` in JavaScript and thought nothing of it? 💥 You might be opening the door to prototype pollution - a sneaky vulnerability that lets attackers modify built-in objects like `Object.prototype` Learn how in this guide by @OpenWebDocs 👇 developer.mozilla.org/en-US/docs/Web…
Which image format really gives you the best balance between speed, size, and quality? 🤔 In this hands-on MDN post, @pgurtovaya runs real compression experiments (AVIF vs. JPEG 🐿️) and breaks down how to pick the right codec for your workflow. developer.mozilla.org/en-US/blog/ima…
🦊 Firefox 145 is here for web developers! Highlights include: • text-autospace for smoother typography • math generic font family • Atomics.waitAsync() for async thread sync • Integrity-Policy headers for subresource integrity See what’s new 👇 developer.mozilla.org/en-US/docs/Moz…
Ever wish HTTP status codes were easier to remember? 🖼️ Check out this MDN cheatsheet that pairs each status code with an emoji to help you visualize what each one means, from 200 OK ✅ to 418 I’m a teapot 🫖 Check it out 👇
🧩 Your supply chain is only as strong as its weakest dependency. From securing build tools to verifying external scripts, this new MDN guide by @OpenWebDocs walks you through steps to protect your projects from supply chain attacks. Read the guide 👇 developer.mozilla.org/en-US/docs/Web…
💡 Want seamless page-to-page animations — no JS required? The new CSS view-transition at-rule makes it possible! ✅ Works in Chrome, Edge, Safari 🦊 Coming soon to Firefox 144 💫 Perfect for progressive enhancement Get started 👇 developer.mozilla.org/en-US/blog/vie…
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