Calling all web developers! Browsers are all meeting up next week (www.w3.org/events/tpac/...). I want your voice to be heard! Tell me your biggest problems, and tell me what you want to see from the platform. What problems are tough to solve, but could be easier?

How many lexicon validators will it take for you to finally write your App

Sounds like Microsoft are committed to erasing GitHub’s last ounces of positive internal culture. Shuttering water cooler channels, moving the staff to outlook+teams and now telling employees they have to change their GitHub handles, many of whom had accounts predating their employment.

This November at the Annual W3C Plenary (TPAC) I'll be discussing "Custom Attributes" github.com/w3c/tpac2025.... I'd like to bring the same lifecycle hooks & subclassing of Custom Elements to attributes. I'd _love_ to hear if developers think this is a good or bad idea, and what they'd like to see.

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

My friends, foals and follies. Apparently snipping you out of context is not enough to inspire fear. The fodder must change. The horsejs must roam free. Stay safe, and remember to eat your pancakes.

London’s food scene is one of the best in the world and this is a hill I will absolutely die on.

I try not to have any kind of human-like relationship

waterfall dev cycles are actually entirely correct

JSX. Is this something people would be interested in?

jason object would be a beautiful name for a baby boy

I miss @horse_js. I'd enjoy some cutting satire of the JS ecosystem right now.

It's impossible to get to inbox zero on GitHub because I got @ mentioned in a couple of spammy repos which are deleted, but the notifications are hanging around in my inbox and I cannot remove them. GitHub knows this is an issue but don't seem to want to fix it so... 🤷

Web component folks: A common feature with request is to "inherit from a button". If that's something you want, which specific button behaviours is it you want to inherit? Why is putting a button in the shadow root not the answer?

Ahhh. Always nice when you can add ~180LOC to your ~100kLOC codebase and make it go twice as fast. github.com/csskit/csski...

🎂 Happy 23rd birthday, Firefox (Firefox 1.0 was released on November 9, 2004 but the first version of the thing that lead up to it – Phoenix 0.1 – was released on September 23, 2002)

`field-sizing` on `<input>` is really handy for groups of editable chips!

Does anyone reading this skeet work on (or know of anyone who works on) www.gov.uk/alerts? The list of alerts is only available as an Atom feed which relies on XSLT to display in the browser, and there appears to be no proper HTML alternative (the link rel=alternative goes to the homepage).

Composition with the Shadow DOM is more powerful than you think. You can do a lot with the default named slot assignment, but manual slot assignment is a pathway to many abilities some consider to be… unnatural.</emperor-palpatine>

👀 commandfor - enabled by default in Firefox 144 Soon, in all browsers, you won't need any JS to open a popover / dialog 🎉 More info in @keithamus.social post here: developer.chrome.com/blog/command...

Has anyone seen any neat uses of the command/commandfor API yet? Any component libraries that support custom command events? Even just anyone whose tried them and wrote about their experience?

The thing about working on a big project like "the last CSS toolchain we'll ever need, built from ground up" is that there's a literal endless list of all the things that need doing. I've found myself knee deep in ASM, to writing tech docs, to dreaming up new syntax. github.com/csskit/csskit

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… 🧵

View Transitions are enabled by default in Firefox Nightly, so they're on their way to stable. Give it a test with your current transitions, and give me a shout if anything doesn't look right.

Gecko: Intent to prototype and ship: improvements to <details> styling, including support for ::details-content pseudo element

⚠️ Last chance to fill out #StateOfHTML 2025 and get browsers to pay attention to your web platform pain points! After popular demand, the survey closing date has been extended for a few more days so that returning OOO folks get a chance to fill it out too! survey.devographics.com/en-US/survey...

started the week by shaving 150KB off chai in 5.3.0 👀

Gecko: Intent to Ship: Command and CommandFor attributes

We've got a good-first bug for new contributors to Firefox: bugzilla.mozilla.org/show_bug.cgi... If you're interested in writing a little bit of C++/HTML/JS to make your first contribution, let me know! I'd be happy to guide you through the whole process over chat or video call.

I am pumped, I did actual computer science! Implementing details-content in Firefox saw a memory usage regression. After staring at it long enough I realised a [Box<T>; 91] could be a sparse set using (Vec<T>, [i8; 91]). The result is not just fixing the regression but improving memory consumption!

🚀A new HTML feature, interestfor, allows for hover-triggered popovers. But how do they work on touch? The article shows different solutions for making them accessible on touch devices, and my thoughts on them. Share your thoughts! #HTML #webdev #accessibility #openui utilitybend.com/blog/html-po...

This is me a couple of days before the first release of PostCSS. From my new article about the history of PostCSS and the lessons I learned from it (for example, how to break an API when you have 400M downloads per month). evilmartians.com/chronicles/w...

State of HTML is live now! Please take it if you care about the web platform! 🙂 These surveys are super helpful for our team to understand the state of the ecosystem and prioritize missing features/platform needs! survey.devographics.com/en-US/survey...

TIL I can’t use Bluesky DMs any more without handing over my personal info to a random website because “won’t someone please think of the children” draconian UK laws enacted last week. So if you’re trying to DM me, maybe try mastodon instead: @[email protected]

Starting my new role on Monday. Could be anywhere.

UK users when the website asks them where they're posting from today.

📢 The State of HTML Survey is live survey.devographics.com/en-US/survey... The #HTML and #CSS surveys are the only web surveys I don't want to miss. Thank you @sachagreif.com for making them, and @lea.verou.me for curating. Please take a few minutes to fill the survey if/when you can. ✨

We've got a good-first bug for new contributors to Firefox: bugzilla.mozilla.org/show_bug.cgi... If you're interested in writing a little bit of C++/HTML/JS to make your first contribution, let me know! I'd be happy to guide you through the whole process over chat or video call.

I did a thing. These are all the steps (with citations) each of the browsers take to determine if a <table> element is really a <table> element or if it's just sparking layout. deploy-preview-2576--wai-aria.netlify.app/html-aam/#el...

Your regular reminder being laid off is not a condemnation of you or (likely) your manager, but instead a signal of incompetence from upper management. Their job is to keep the business sustainable and they failed, and you get to pay the price. www.theverge.com/news/693535/...

Hot off the presses! Firefox Nightly (www.mozilla.org/en-GB/firefo...) adds the new :heading pseudo! Easily style all headings, or use nth-child-like AnB syntax to select a range of headings! Needs `layout.css.heading-selector.enabled` flag enabled. Try it out and let me know your thoughts.

Gecko: Intent to Prototype: headingoffset & headingreset attributes

Gecko: Intent to Prototype: :heading & :heading(AnB#) selectors

When people ask me about my job

Okay gang, those who sling HTML, CSS, JS, which _Firefox_ bugs are blocking you? Which features do you think need improving? What new features would you like to see? What work would you prioritise? Big or small, bonus points for linking to a bug (even more for filing bugs then linking them)!

github.com/AasishPokhre... Looks like GitHub just hit a billion repos.

Job hunting is a truly soul-sucking experience, so I'm posting my CV here just incase one of you needs a technical leader with web standards, dev advocacy, or strategy experience. Please save me from the 4th circle of hell (aka Linkedin) 🙏🏾 You can see my CV in full: docs.google.com/document/d/1...

Hey friends, did you know you can make a modal <dialog> element dismissible by clicking outside (aka light dismiss) by adding `closedby=any` to it. That's it. That's all there is to it. <dialog closedby=any> developer.mozilla.org/en-US/docs/W... Chrome 134+, Firefox 140+, coming soon to Safari.

📻 What the Spec?! episode 2 dives deep into the new Popover attribute & accessibility! Hidde De Vries gives me a breakdown of how popover accessibility works. Listen on your favourite podcast app. Show notes & transcript is available below. lolaslab.co/what-the-spe...