Anthony Frehner

To celebrate my first merged PR into Firefox core, I wrote a too-long article on Contextual Design for (Opinionated) Component Libraries. frehner.me/blog/context... And it concludes with my reasons for submitting patches to Firefox and WebKit. Lots of thanks to everyone who helped out, or

If you ever struggled with understanding if your CSS performance issues are coming from style calculation or from layout, LoAF's styleDuration and layoutDuration is shipping in Chromium 158 to help with that groups.google.com/a/chromium.o...

Happy World Browser Day! I've long used "long live the web" as my motto/tagline, so today I published a blog post explaining what this phrase means to me: longlivetheweb.org/not-a-manife...

Things I hope to push forward at TPAC: - Declarative fragment / client side include - declarative skeleton/shell - CSS navigation matching - parser/patch reflection in mutation observers - responsive image improvements - connection allowlists - focusreset - CSS module imports Gonna be interesting!

What do you want us to work on in 2027? Here's a web app where you can rank the Interop proposals you care about, giving us data we can use to prioritise feature development. interop-rank.fxdx.dev

Does your design system still form the style/layout/size of components based on touch vs mouse? If so, what — if any — considerations do you have for dual-input devices that are both touch and mouse capable? Which experience do you give them?

What if there was a Web Components conference?? @stuffbreaker.bsky.social and I are teaming up to get a little more serious about the idea of getting one together. We want to gather data on if there is interest in the community forms.gle/ZGqtYGj7V6q8... Please fill out and share to anyone!

Almost wrapped up my next CSS proposal today Maybe tomorrow? Probably not actually, but hopefully this week Really hoping it’s such a minor thing that it’ll be easy 🤞

I would kill for a tube of cookie dough right now

Super fun stuff!

@mcmurdie.bsky.social great talk today on signals!

@erikch.bsky.social thanks for the talk! Great job

@timdamen.io thanks for the talk today! Great job

This is huge for component libraries, written as web components, that have to somewhat recreate native CSS due to environment limitations. 👀

My attempt to implement :has-slotted in WebKit has turned into another round of CSSWG clarifications on behavior Whoops

What the hell is aspic Why the hell is aspic

JS ‘using’ support is exciting

moveBefore support incoming! That’s huge!! Thanks @jovidecroock.com and team

Starting with Firefox 155, Nightly builds now support the at-rule() function for @supports. This allows authors to detect for browser support of specific at-rules, such as @supports at-rule(@scope). bugzilla.mozilla.org/2060754

Heading Offset 👍🏾⬆️

This is a huge experiment for web component people that want/need to have custom select and custom option elements!

popover="hint" landed in Firefox 153. Here's how it differs from regular popovers: youtube.com/shorts/HWetx... (sorry for the YouTube link, it seems like video uploads are broken on bsky today)

Gecko: Intent to Ship: Advanced CSS attr() function.

Hi! I'm working on a new HTML feature: filterable select There are two proposed API shapes so far: 1. Nesting <input> in <select> 2. Sibling <input> for listbox <select> w/id ref Option 1 is more ergonomic, but would break selects in older browsers Thoughts? (Both currently in Canary w/flag)

Ooh found another bug in Firefox. My company’s biannual hack fest is coming up soon, maybe if it’s not solved by then I’ll take a shot at fixing it. bugzilla.mozilla.org/show_bug.cgi?id=2049752

Crazy and somewhat feasible idea of the day (with @nerdy.dev): Decompile CSS Style Queries to Space Toggles for older browser support but written in the better syntax Not a 1:1 comparison, limited in some ways, but if you live in those constraints, could work.

Firefox 152 landed today, and includes web platform features like: 🎉 CSS field-sizing 🎉 Notification actions 🎉 unadjustedMovement pointer locks 🎉 getAnimations() pseudoElement option …and more! developer.mozilla.org/en-US/docs/M...

Prop For That 📣 An a-la-carte #JS library for #CSS developers that writes meaningful realtime CSS variables to an element: - value of an input - pointer position - size of scrollbar(s) - colors in an image/video - element's visibility - tons more… nerdy.dev/prop-for-that

What web technology is coming in Safari 27.0? Find out here. webkit.org/blog/17967/n...

You already know the Gehrig Day shirt choice!! Thanks to @rotowear.bsky.social & @pitchingninja.com ! 😭 #EndALS

How’s moveBefore coming along? Are libraries adding support for it or still waiting it out? Would be nice to use the connectedMoveCallback lifecycle