Please note that Chrome pushed an update, and YOUR DEV CONSOLE (history) MAY BE READ BY HUMAN REVIEWERS. Sure, console should never be treated as a secure env, but I still fucking hate this.

My book, Accessibility For Everyone, is now free and online as a website. accessibilityforeveryone.site The book was first published by A Book Apart in 2017 but it holds up! It covers web accessibility for designers, developers, content folks, and really everyone who works in tech.

Firefox 147 just landed & it's pretty huge in terms of web features: 🎉 CSS anchor positioning 🎉 The navigation API 🎉 View transition types 🎉 Brotli support in Compression/DecompressionStream 🎉 CSS module imports And more! https://developer.mozilla.org/en-US/docs/Mozilla/Firefox/Releases/147

We just published 6 CVEs identifying security vulnerabilities in React Router and Remix v2 We recommend updating to the latest appropriate versions: React Router v7 -- 7.12.0 React Router v6 -- 6.30.3 Remix v2 -- 2.17.2 Details, links, and package ranges are listed below

🥳 TypeSlayer is out! celebrate by posting what your type graph looks like! it legit has an actual leaderboard now: so bonus points if you win lol 🏆🏆 run: `npx typeslayer` source: github.com/dimitropoulo...

⚔️introducing TypeSlayer⚔️ A #typescript type performance benchmarking and analysis tool. A summation of everything learned from the benchmarking required to make the Doom project happen. It's got MCP support, Perfetto, Speedscope, Treemap, duplicate package detection, and more.

Researchers have found two new vulnerabilities in React Server Components while attempting to exploit the patches last week. These are new issues, separate from the critical CVE last week. The patch for React2Shell remains effective for the Remote Code Execution exploit.

There is critical vulnerability in React Server Components disclosed as CVE-2025-55182 that impacts React 19 and frameworks that use it. A fix has been published in React versions 19.0.1, 19.1.2, and 19.2.1. We recommend upgrading immediately. react.dev/blog/2025/12...

We've got some updates on TypeScript 7! The new native port - can type-check any project - supports --build and --incremental - has rich editor features implemented - is still 10x faster and is ready for you to try today! devblogs.microsoft.com/typescript/p...

It's December 1st, which means that throughout the entire month you should reserve 5-10 minutes every day to read a fantastic article about HTML. ❤️‍🔥 Check out what's hidden behind the first door. htmhell.dev/adventcalendar

The State of React 2025 survey just opened! I’ll be very keen to see what the community thinks of some of the newer features like Actions, now that they’ve been available for a while. Take it here: survey.devographics.com/en-US/survey...

Type stripping is now stable. Enjoy 🌞

As an experiment, we (the Firefox team) wanted to try a new way to get feedback on which Interop proposals matter most. So, here's a web app where you can rank the proposals you care about, giving us data we can use when reviewing which ones to champion. interop-rank.jakearchibald.com

“A threat model for accessibility on the web” alice.boxhall.au/articles/a-t... A deep, well-researched & cited piece detailing systemic failures down the web stack (standards bodies, browsers vendors, etc) which marginalize #accessibility and its voices — but with proposed solutions. #a11y

React 19.2 is now available! This release includes Activity, useEffectEvent, React Performance Tracks, partial pre-rendering, and more: react.dev/blog/2025/10...

So far I've received 11 submissions for this year's #HTMHellAdventCalendar. They look fantastic, but, you know, I need at least 24. You can write about anything you want related to HTML. There's no “too basic”; we need more fundamental HTML knowledge out there because we suck at the basics. 1/2

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… 🧵

Interop 2026 is now open for proposals! This is your chance to tell browser-makers which well-defined, well-tested features you wish had better support across browsers. ⬇️ Here's how ⬇️ github.com/web-platform...

Oh, it's September already. Time for the HTMHell Advent calendar Call for Papers! 🖤 docs.google.com/forms/d/e/1F...

I made a quiz about the JS Date parser is. It's very easy and you will score very high. jsdate.wtf

“My Request to Google on #Accessibility” adrianroselli.com/2025/05/my-r... I’m asking this massive company to stop releasing features & products & ideas that are obvious barriers. And I want them to stop expecting free labor from the community. It’s tiring, frustrating, and disrespectful. #a11y

Wow Mozilla is cancelling Pocket. blog.mozilla.org/en/mozilla/b...

For years, one of the most befuddling things for me in CSS was how “height: 100%” would sometimes just not work. Every time I tried to use it was a roll of the dice. 😅 Like everything else in CSS, though, it all makes perfect sense when we understand the underlying mechanism. ✨ Let’s explore. 🧵

ECMAScript Excitement 🎉 This week, at its 107th meeting, TC39 advanced these proposals: 2️⃣.7️⃣ Non-extensible Applies to Private 2️⃣.7️⃣ Upsert 2️⃣ export defer 1️⃣ Compare Strings by Codepoint 1️⃣ Composite Keys 1️⃣ Disposable AsyncContext 1️⃣ Enums 1️⃣ Object.propertyCount and withdrew Records & Tuples

React Compiler RC is now available! We've added support for swc and are working towards a stable release react.dev/blog/2025/04...

Default styles for <h1> elements are changing 👉 developer.mozilla.org/en-US/blog/h... #webdev

Forget Chrome: Why Firefox's new vertical tabs are such a productivity game-changer www.zdnet.com/article/forg...

Today, we’re deprecating Create React App for new apps, and encouraging existing apps to migrate to a framework. We’re also providing docs for when a framework isn’t a good fit for your project, or you prefer to start by building a framework. react.dev/blog/2025/02...

JavaScript's date object has been tricky for years, but that will change soon. 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/blog/...

Join us for the first CSS Café meetup of the year! 🎉 @rachelandrew.bsky.social will show us a new solution for the visual vs. source order disconnect in CSS: the upcoming reading-flow property! 🌐✨ www.meetup.com/css-cafe/eve...

How AI-assisted coding will change software engineering: hard truths. About how these AI tools really work and how they could be the start of the return of software, as a craft. Based on a guest post by @addyosmani.bsky.social. Read it here: newsletter.pragmaticengineer.com/p/how-ai-wil...

React v19 is now stable! react.dev/blog/2024/12...

It's December 1st, and you know what that means: For the next 24 days, we'll publish articles about HTML by 24 authors. You can read them on the website or subscribe to the RSS channel. Enjoy! htmhell.dev/adventcalend...

Vite 6.0 is out ⚡️ vite.dev/blog/announc...

I have been working on some new bookmarklets that may be useful for some a11y folks (and developers in general). Thread to follow featuring one tool per post.