MDN Web Docs @MozDevNet
The official MDN Web Docs account. We deliver the best web docs around. developer.mozilla.org Worldwide Joined March 2013-
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Did you know about Strict Mode? 🤔 ✨ "use strict"; ✨ Strict Mode catches silent errors, making your code more predictable and easier to debug. It also improves performance and helps you write more secure JavaScript code. See how 👇 developer.mozilla.org/en-US/docs/Web…
What exactly is the viewport? 🔍 The CSSOM View Module defines key concepts like the visual & layout viewport, and initial containing block, and understanding them is essential for responsiveness, scrolling, and positioning correctly. Master viewport 👇 developer.mozilla.org/en-US/docs/Web…
Bring your UI to life! 🎞️ The Web Animations API lets you animate elements directly with JavaScript, no CSS keyframes or external libraries required. ✅ Timeline control ✅ Play, pause, reverse ✅ Precise performance & sequencing Learn how to use it 📖 developer.mozilla.org/en-US/docs/Web…
Margin? Border? Padding? Content? 💅 The CSS box model is the foundation of layout, and MDN’s interactive exercises help you truly understand how it all fits together. 💡 Practice live in your browser developer.mozilla.org/en-US/docs/Lea…
Relative color syntax is a game changer! 🎨 Lighten, darken, shift hue, tweak alpha, all without manually converting color formats. ✅ Works with custom properties ✅ Keeps your design system DRY ✅ Supported in modern browsers Learn more 👇 developer.mozilla.org/en-US/docs/Web…
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 👇
Firefox 142 is here! 🚨 This release brings powerful new APIs and platform improvements for developers, from smarter task scheduling to modern URL handling. Release notes for developers 👇 developer.mozilla.org/en-US/docs/Moz…
TIL: Compression Dictionary Transport 💡 A new HTTP feature that can dramatically shrink the size of your responses, especially when serving content that changes often but includes a lot of repeated structure (think: JSON, JS, CSS). Learn more 👇 developer.mozilla.org/en-US/docs/Web…
Yay! It's the first Firefox release since I've joined the team, so let's take a look at some of the new developer-facing features in Firefox 142… 🧵
BCD v7.0.0 is out! 🚨 There is a breaking change to TS definitions for version fields, with schema. 🆕 VersionValue is now string | false 🆕 version_removed & version_last are now always string ⚠️ Consumers using TS: check your code! Full details 👇 github.com/mdn/browser-co…
🆕 Firefox 142 adds support - Prioritized Task Scheduling API! 🦊⚙️ ✅ Offload low-priority work without blocking the main thread ✅ Great for UI updates, background syncs, and more Release notes 👇 developer.mozilla.org/en-US/docs/Moz… Learn more with @jaffacake 👇
🆕 Firefox 142 adds support - Prioritized Task Scheduling API! 🦊⚙️ ✅ Offload low-priority work without blocking the main thread ✅ Great for UI updates, background syncs, and more Release notes 👇 developer.mozilla.org/en-US/docs/Moz… Learn more with @jaffacake 👇
MDN just got a glow-up! 🌟 We’ve completely rebuilt our front end, redesigned, reengineered, and ready to help you find what you need. ✨ New search ✨ Improved typography & code rendering ✨ Sleeker nav & icons Read more 👇 developer.mozilla.org/en-US/blog/lau…
Join us today for this month’s MDN Community Call! 🎉 We're here with a special session to celebrate MDN’s 20th birthday and the launch of our brand-new frontend! 🚀 📅 TODAY 🕔 17:00 CET 📍MDN Discord Everyone’s welcome on our Discord! 🧡 discord.com/events/1009925…
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 exploring 👇 developer.mozilla.org/en-US/docs/Web…
🆕 Now in Firefox 142: URLPattern support! 🔍🦊 It gives you a powerful way to match and parse URLs using patterns, perfect for routing, URL validation, service workers, and more. Full release 👇 developer.mozilla.org/en-US/docs/Moz… @jaffathecake made a video sharing more 👇
🆕 Now in Firefox 142: URLPattern support! 🔍🦊 It gives you a powerful way to match and parse URLs using patterns, perfect for routing, URL validation, service workers, and more. Full release 👇 developer.mozilla.org/en-US/docs/Moz… @jaffathecake made a video sharing more 👇
Firefox 142 is here! 🚨 This release brings powerful new APIs and platform improvements for developers, from smarter task scheduling to modern URL handling. Release notes for developers 👇 developer.mozilla.org/en-US/docs/Moz…
Join us for this month’s MDN Community Call! 🎉 We're here with a special session to celebrate MDN’s 20th birthday and the launch of our brand-new frontend! 🚀 📅 27 Aug, 25 🕔 17:00 CET 📍MDN Discord Everyone’s welcome on our Discord! 🧡 discord.com/events/1009925…
We’ve launched MDN’s new front end — and it’s just the beginning. Intentionally targeting Baseline "Widely available" features when deciding on which ones to use. This means we're able to adopt modern CSS and web components for our UI. Check it out 👇 developer.mozilla.org/en-US/blog/lau…
Margin? Border? Padding? Content? 💅 The CSS box model is the foundation of layout, and MDN’s interactive exercises help you truly understand how it all fits together. 💡 Practice live in your browser developer.mozilla.org/en-US/docs/Lea…
Search from anywhere. Navigate like never before. 🧭 The new MDN front end comes with a new search modal, refreshed UI, and better typography for docs that feel as good as they read. Take a look 👇 developer.mozilla.org/en-US/blog/lau…
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