CSS Excitement! > RESOLVED: Add `color-scheme()` test to both `@container` queries and `if()`. github.com/w3c/csswg-dr... This means you can do a light-dark() that works with any type of value 🤩🤩 ``` background-image: if(color-scheme(dark): url(dark.svg); else: url(light.svg)); ```

This is huge, Temporal is on its way, its been a long effort and great to see collaboration on a centralized Rust library including V8 who have never integrated Rust before now! Shout out to everyone who has been involved. Much more info in the blog post!

l have a blog again. New post. olliewilliams.xyz/blog/html-re...

The Perils of Reactivity outbox.matthewphillips.info/archive/peri...

📰 Firefox just landed support for native CSS Modules! 🥳 Here's Firefox Nightly with layout.css.module-scripts.enabled running a Codepen that uses standard CSS modules. codepen.io/justinfagnan... * *updated from @chriscoyier.net's original That makes Chrome & Firefox w/ support. Next up Safari 🙏

Safari 26 is here!!! Anchor Positioning, Scroll-driven animations, High Dynamic Range images, the new HTML <model> element, the all-new Digital Credentials API, SVG icon support, WebGPU, WebKit in SwiftUI, every site can be a web app on iOS and iPadOS, and much more. webkit.org/blog/17333/w...

Lots of goods suggestions for Interop 2026. I’d particularly like to be able to use font-family: ui-rounded github.com/web-platform...

Is there a way to generate a new random value using the random() CSS function without reloading the page?

Design Tokens standard is approaching v1.0 www.w3.org/community/de...

🚀The new CSS sibling-index() and sibling-count() functions let us create staggered animations, dynamic color palettes, and even complex circular layouts with ease. I wrote about my first experiments with these fantastic new CSS additions. So much fun! ♥️ ✨ #CSS utilitybend.com/blog/styling...

Pretty sure Chrome is using an AI bot for their tweets 😔. AI will happily hallucinate/lie about the contents of release notes.

some thoughts about the bloat introduced by edge-case first libraries

📣 Web devs — we need your input! We're running a short survey (1–2 min) to understand interest in using ReadableStream as a request body in the Fetch API. Help us guide implementation priorities, especially around support & use cases. Fill it up! 👇 survey.alchemer.com/s3/8460326/...

While Rolldown can still emit CJS, the bundler itself is ESM-only now! Time to move to ESM-only for your packages as well? 👀

Surprising data from the Web Almanac: despite the existence of animated WebP and animated AVIF, usage of .gif files increased over the previous 2 years almanac.httparchive.org/en/2024/media Animated AVIF still has issues github.com/web-platform...

Please 👍 the proposals I have suggested for inclusion in Interop 2026 github.com/web-platform... I wanted to suggest the Sanitizer API but it is still an “Unofficial Draft” (after several years) so sadly ineligible. Implementation is ongoing in Firefox and Chrome… wicg.github.io/sanitizer-api/

What if some client-side browsing features were part of the web platform? Direct CSS reflection of URL state, snappy pending/optimistic UI, URL-to-scroll-snap binding, and some basic same-document navigation use cases, with JS being only an option. github.com/WICG/declara... Inviting feedback!

thanks for having me on!! for people interested in a more polished prose take, do take a look at the companion article over at queue.acm.org/detail.cfm?i...

Hey folks! Are you interested in fetch upload streams? If so, what do you want to use them for?

I've created a proposal for a new CSS style query or pseudo-class that gets the current 'used color scheme'. "But don't we already have @media (prefers-color-scheme)?" Yes, but authors can override the color scheme and the media query can't know that. github.com/w3c/csswg-dr...

I keep giving LLMs a chance to impress me, whenever I encounter a boring task that they should be good at, and they keep shitting the bed. Not like 'this was too hard a problem for fancy autocomplete' shitting the bed, like 'randomly deleting swathes of code' shitting the bed

Hi all 👋 We're gearing up for 2026 planning soon (UI capabilities and Interop) Do you work on a UI library or framework? I want to hear from you and your experiences/needs. Message me!

Mac Pro is such an uncared for device on Apple’s part. All Apple products support AV1 video decoding except: the cheap base model iPad and the Mac Pro. Even the budget iPhone 16e supports AV1 decode. Starting price still £7,199

We're exploring streaming HTML into an element in github.com/WICG/declara... but you can already emulate it with some JS that feeds a parser of a detached document and moves elements as they appear. cc @nomster.bsky.social

Just got command buttons enabled in stable on WebKit trunk! Firefox recently sent out an intent-to-ship so hopefully by early next year they'll be available across the board.

Gecko: Intent to prototype: CSS Module Scripts

👀 “Added support for CSS tree-counting functions” webkit.org/blog/17282/r... That’s `sibling-count()` and `sibling-index()` functions!

Big CSS progress today. Scope v1 issues are all resolved: github.com/orgs/w3c/pro... Progress on gamut mapping colors: github.com/orgs/w3c/pro... Masonry will get a unique `display` value from grid. Name TBD: github.com/w3c/csswg-dr...

Gecko: Intent to Ship: Command and CommandFor attributes

#CSS [css-anchor-position] applying custom transform-origin and translate per position-try option

If your using field-sizing: content but want to control the initial size of the input, turns out its pretty complicated? width: max(calc-size(fit-content, size), 100px); Someone let me know if there's an simpler approach...

Today GitHub Copilot told me some wrong information and invented quotes from some reference links to prove it was correct. I’m not investing time into AI until these hallucinations become less constant.

Have you had a chance to read about `item-flow` and CSS Masonry? webkit.org/blog/17219/i... What do you think about the two open questions? We need feedback from the people who make websites…

Does <input type="color" colorspace="display-p3"> actually work? It seems like it's still constrained to sRGB? What even is a Display P3 Hex colour? That's just confusing.

It's always a kick to be reminded that much of Firefox's UI is built with @lit.dev.

🆒 github.com/whatwg/html/...

Chrome 140 beta

I loved using the pipe operator (|>) in Hack at Meta and am excited to see it coming to PHP. Maybe one day it can be piped to JS, too! thephp.foundation/blog/2025/07...

@bram.us Chrome release notes seem to be wrong, font-width isn't actually supported yet. developer.chrome.com/release-note...

I'm *very* excited about this! And now that I'm building apps with @lit.dev, I have a chance to try it myself in something other than a demo!

Reading through this example of using a CSS style query and wondering what makes a CSS style query superior to just using a class? .success, .danger, .warning, .primary?

Got quic in Node.js making progress again now that openssl 3.5 has landed, and finished another chapter in the book. Productive weekend. github.com/nodejs/node/...

Boom, much to @justinfagnani.com's delight (I assume :P) we have much more docs on the @tanstack.com Form Lit adapter as well as better examples: tanstack.com/form/latest/...

I don't have an Android phone but it looks like Android 16 is using a rounded font in the OS UI. I wish Chrome would implement ui-rounded in CSS so we could use it on the web...

The CSS property font-width works in Safari. It’s an alternative name/alias for the horribly named font-stretch property

Had no idea this was happening 🤯 tanstack.com/stats/npm?pa...

I've been invited by the wonderful @tanstack.com team to help them build out framework-agnostic devtools not for only them, but for everyone! Here's a sneek peak of TanStack router, query, and @prisma.io embedded studio running in @tanstack/devtools

Setting CSS ::selection via relative colors codepen.io/cssgrid/pen/...

👀 new url at WHATWG cookiestore.spec.whatwg.org