Penny

Here's the recording of this year's “What's new in Web UI” talk @una.im and I gave at Google I/O earlier this week. youtu.be/uT7MVcCQ4rw Very happy with how it went, and I think you might find it useful, so give it a watch 😊 #ChromeDevRel #GoogleIO

Turn your website into an agentic toolkit 🌐 Catch the 3 big Chrome updates from #GoogleIO: 🛠️ WebMCP for agentic toolkits 🐞 Autonomous debugging via Chrome DevTools 📑 Modern Web Guidance Learn more: goo.gle/IO26-Chrome-...

It’s shocking how the motivation behind almost every single bad tech bill is about hating LGBTQ people and specifically trans people

The great thing about Scroll-Driven Animations is that they work with your existing CSS animations. The framework to get started is simple: 1. Take an existing animation 2. Drop the duration 3. Set the animation-timeline to view() or scroll() scroll-driven-animations.style has a free video course

So. Anchor Positioning and DevTools … I sat together with The Hype™ tonight and this is what we built in 2 hours. Main takeaway from this experiment is that it still requires a “Subject Matter Expert” (in this case: me) to build this, instructing The Hype™ what to do (and sometimes how to do it).

Dear God, what have we done? Maybe adding this was a mistake? But seriously clever (mis)use of this! And surprisingly little code!

🎉 I'm so excited that scoped custom element registries is landing in Chrome and Edge! 🥳 This solves one of the biggest complaints with the web components APIs: the global tag name namespace. Standards is a long game though: I first proposed this in 2017! 😲 developer.chrome.com/blog/scoped-...

Element-Scoped View Transitions are gonna be **SO GOOD** There’s still some details to settle, but the main thing is there: run VTs on a subtree of the DOM, allowing parallel VTs. And with `view-transition-scope` you can limit the scope of `view-transition-name` values, allowing VTs to be nested.

border-shape can handle both insets and outsets, so you can do effects like this chevron nav (corner-shape can't do both). This means you get a perfectly-wrapping focus ring without needing to manage z-index or having it partially covered due to overlap. Demo: codepen.io/una/pen/ByzY...

Excitingly, Chrome Canary recently added support for <meta name="text-scaling"> behind a flag. What is it? It's something that we're all going to start using on our websites to improve accessibility. Here's a blog post with more info. www.joshtumath.uk/posts/2026-0...

a powerful #CSS transition technique enters the ring: Anchor Interpolated Morphing (AIM) nerdy.dev/anchor-inter...

Any Port in a Storm When the storm is so full on that a mere 6 seconds is bordering on over-exposing the image! So bright. Soooo bright. - #Twizel, #NewZealand. - "Look with your eyes. See with your Soul." #Aurora #Night #Stunday #Scape #EastCoastKin #Landscape #Nightscape #Bucketlist #Travel

What an amazing year it's been for CSS! 😅 I'm so proud of the team and all of our collaborators working on other engines for what's been accomplished in 2026. ❤️

Wow! Really fun, creative use of scroll-state queries, style queries, and scroll-driven animations from Lee Meyer css-tricks.com/scrollytelli...

There’s a lot of cases where I needed this, so I’m very excited to seeing `random()` come to CSS. While trying it out, however, I found the caching strategy options to be very confusing … so I am proposing to rename some of the keywords: github.com/w3c/csswg-dr... Any Hot Takes™ on this?

✨ Core Web Vitals Summit ✨ stream is today in just over 1hr, @ 11am, virtual doors will likely open a few minutes before. Join us! Hang out. Come hear from web performance and ux professionals. 📆 TODAY, Wed Dec 3rd ⏰ 11a EST, 5p CET 🔗 bit.ly/cwv-summit

A stochastic terror campaign against anyone who is trans or gender nonconforming. We wake up with this fear, and we go to bed with this fear. And it weighs on us every minute of our lives. Exactly as intended. And most institutions not only don't protect us, they protect the aggressors.

Master scheduler.

love seeing all the #CSS subgrid excitement in my timeline!! def @joshwcomeau.com inspired 🤘🏻 now that your subgrid interest is piqued, checkout a post I made too‽ maybe even just for the long list of resource examples at the end web.dev/articles/css...

Trying to finish my work day be like ...

Good news! Range syntax for style queries and if() functions has shipped in Chrome! Check it out: una.im/range-style-...

At the CSS WG meeting, we're discussing possibly natively doing fit-text in CSS. Send us your use cases (with screenshots/links)! Do you ever need to fit multi-line text? Do you ever need to fit non-text inline elements (e.g. icons)? Do you adjust font-size, letter-spacing, or both?

Good morning and happy Sunday 🐴 🥰

TPAC 2025! Say hello if you see me there.

Just witnessed Pixel, having emerged from the cat room after taking a particularly noxious dump, sniff the air dubiously then turn tail and return to her litter box to bury matters further. Thanks for the courtesy flush, Pixel!

✨ It’s that time of year! The State of JavaScript 2025 survey is currently running. 😄 I take the survey every year. It’s a great way to keep up with all of the new features and APIs that have come to browsers in the past year. stateofjs.com/en-US

We often hear that folks want "wrap detection" in CSS (i.e. when a flex item shifts into a position where it wraps over to the next line) What is a real-world example of a use-case you would need this for?

I flipped the flag on this one today and it’s now enabled by default. Expect it in tomorrow’s Chrome Canary build. (If you can’t wait to try it out, you can manually flip the flag in today’s Canary/Beta/Dev builds. Go to chrome://flags and look for starting-style)

At #fronteers #DarkMode, @utilitybend.com proposed the <rangegroup> HTML Element. It unlocks the multi-handle range slider, a pattern you might have already seen when picking a price-range. Feedback Form (with links to the explainer and demos): docs.google.com/forms/u/0/d/...

Talk about making an entrance!! 🍰✨ @una.im

I’ll be speaking in Toronto in a couple of weeks! It’ll be on animation design, and some of the cool things we can do to make our websites/webapps more whimsical. ✨ fitc.ca/event/webu25...

🤩 View Transitions excitement! Goooooo Ladybird! > This month, a lot of the underlying machinery for this has been implemented. It's going to take a bit longer before it's usable, but it's a good start to an exciting new web feature. buttondown.com/ladybird/arc...

Accessible CSS carousels are here! Our new post, co-authored with @flackr.bsky.social and Lucas Radaelli (x.com/lucasradaelli), walks you through building them with the new APIs. The APIs are Interop 2026 proposals, soon on their way to all browsers. 🤞 developer.chrome.com/blog/accessi...

There's a nice series from @sturobson.com getting into *why* and *how* to "un-Sass" CSS. www.alwaystwisted.com/articles/UnS... @jeffbridgforth.com is making a similar leap and shares how he's approaching it: css-tricks.com/is-it-time-t...

This is such a great enhancement. Being able to have any tool that talks MCP have the ability to deeply introspect your pages is huge.

We’re live!! My brand-new course, “Whimsical Animations”, is now available. 🥳🎉 whimsy.joshwcomeau.com I’m so excited to share all of my animation tools and techniques with y’all. 😄

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 amazing! The company behind it is uniQure and it's a type of gene therapy. Does anyone know the story about the preclinical work leading up to it? It know a lot about the discovery of the HTT mutation (an amazing story!). I'm curious about this specific microRNA approach: who developed it?

guidelines for building interfaces on the web interactions, animations, layout, content, forms, performance, design & copywriting includes an AGENTS​.md

Memories of Fiery sunsets. Grundy, Ontario Sept 2016 #WeekMforMemories #AlphabetChallenge #EastCoastKin #sunset #ShareCanGeo #blueskyphotography #GrundyPP

Blink: Intent to Ship: Interest Invokers (the `interestfor` attribute)

Blink: Intent to Ship: :target-before and :target-after pseudo-classes

Blink: Intent to Prototype: Overscroll Gestures

Blink: Intent to Ship: Respect overscroll-behavior on non-scrollable scroll containers

To do this with the (upcoming) interest invoker API, it's 1 line of code: .parent:has(:interest-source) button { interest-show-delay: 0s; } You have your default delay. Then, you update the interest delay when an element inside of the parent has interest (i.e. hover). codepen.io/una/pen/LEpw...

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...

Lotus #photography #flowers #plants #blossom #BloomScrolling

Concurrent View Transitions is a huge unlock, please kick the tires on these and give us feedback!