Philip Jägenstedt

I'm going to be hosting a session at TPAC next week in Dublin to have an open discussions on how browsers could help with atproto, activitypub, lws, indieweb, more specifically with identity! www.w3.org/events/meeti... I'd love to see you all represented there, remotely or in person!

Did you know the State of HTML 2026 survey is currently open? Go take it and brush up on new (and old) browser APIs! survey.devographics.com/en-US/survey...

✍️ Just published a new post about my most-anticipated CSS proposals from Interop 2027! If you’re not familiar, the Interop project is a collaboration between browsers to pick shared focus areas. There’s *so much* good stuff this year, it was hard to pick just 10!

Chrome 155 adds support for JPEG XL (.jxl) → goo.gle/4yYpSjW Expect 30-50% smaller file sizes than traditional JPEGs, native HDR, progressive rendering, and lossless JPEG transcoding. Under the hood, Chrome uses jxl-rs, a pure Rust decoder built for maximum memory safety and performance.

Did Ukrainian drone strikes really silence Russia's social media bots? (No) A real Cloudflare chart fueled a viral story ab MAGA and AfD accounts going quiet. But the evidence doesn't support the rumor. I wrote about bots, vibes, & what we've lost as platforms have shut down tools & data access.

Meanwhile, at anthropic

I reposted a claim about bot activity on X which I wanted to believe. Now reposting the correction which is not as fun, but the required penance for being wrong.

So there currently a raging debate on X, Bluesky & other platforms where people are using a drop in Cloudflare's YandexBot traffic to claim that right-wing online engagement is falling. radar.cloudflare.com/bots/as13238... That conclusion doesn't follow from the data.

I blogged about my picks for the Interop 2027 project: www.sarasoueidan.com/blog/interop... inspired by @vale.rocks @pawelgrzybek.com @tylersticka.com @ohhelloana.blog and others who have blogged about their rankings.

everyone's sharing their ranks - @ohhelloana.blog - ohhelloana.blog/my-interop-2... @tylersticka.com - tylersticka.com/journal/inte... @pawelgrzybek.com - pawelgrzybek.com/my-interop-2... @vale.rocks - vale.rocks/micros/20261... 🙏🖤

My personal brain wants some things but my work brain wants others. So I was forced to blog about it: ohhelloana.blog/my-interop-2...

aamtest: Testing accessibility in WPT blogs.igalia.com/mrego/aamtes... This blog post covers the work @igalia.com has been doing to add a new type of tests in WPT, which allow testing the platform accessibility APIs directly. Thanks to NLnet Foundation for sponsoring this work.

I’ve spent the better part of the last 2 years both using coding models and trying to help these models deliver higher quality code and I honestly could not agree more with Zach here… www.zachleat.com/web/ai-websi...

The "no steps back" is, in my opinion, what sets atproto apart from everything that came before it. I use it too for much of my work in browsers too, under a different name: user behavior / developer backwards compatibility. It comes at a massive cost, but I think is a powerful guiding principle.

ah damn, RIP Margaret Hamilton. she took safety-critical software engineering seriously, and got people to the moon and back. news.mit.edu/2026/margare...

Introducing Iris-AVIF, a better AVIF encoder & the best image encoder in the world: halide.cx/blog/introdu... Iris-AVIF offers up to >21% better compression than libaom, the reference AV1 encoder with image-specific tuning. #av1 #avif #jxl

Remember Internet Explorer’s “Page Transitions”? Well, they’re back, thanks to the View Transition API! → Blog post: brm.us/page-transit... → Demo site: page-transitions.style The project leverages IE’s meta tags so browser support is not limited to Modern Browsers™ but also includes IE 5.5–8.0 😆

📝 New Post: Recursion is DEAD and HTML killed it. daverupert.com/2026/10/html...

Today marks three years since the terrorist attacks of 7 October in Israel. We honour the victims and stand with the families who still carry the heavy weight of grief. We remember the young lives cut short at a music festival. And the long ordeal of the hostages.

You don't have to think JPEG XL is the best format, or plan to use it, to understand that we all benefit when browser vendors are responsive to developer feedback. I'm sorry it took this long in Chromium, and while I'm unlikely to use this format in my own work, I'm happy we're adding options.

JPEG XL shipped in Chrome 155 today, try it out! Huge kudos to Luca and team for getting this done. Image codecs are cool in so many levels, and I'm super impressed by the people who make that magic happen. developer.chrome.com/blog/jpeg-xl...

Developer Signals: shape what browsers build next. Rick Viscomi made a tool to browse upcoming web features and Interop 2027 proposals, vote with GitHub, and share use cases that go straight to browser vendors. #interop #browser developer-signals.dev

The State of HTML 2026 survey is now open! survey.devographics.com/en-US/survey...

GitHub just finished ripping styled-components out of github.com. Result: 55% less time to server-render a page, 25% faster component init. CSS-in-JS makes you pay for styles twice: collecting them on the server, running JS on the client. Static CSS is *always* more efficient. Ship CSS.

Happy kanelbullens dag to all who celebrate! 🇸🇪

Always nice to do updates like this one 😊 Yes, CSS `light-dark()` with `<image>` values is now available in all major browser engines. Check brm.us/light-dark-i... to get the details.

On this day, it's crucial to remember the radical importance of "wherever you get your podcasts", as explained by @anildash.com

example.com just changed for the first time since 2013, and IANA replied to my email asking why. Here's the full reply: www.oliverdunk.com/2026/09/30/i...

Welcome to the new PLC Organization @plcred.org “a small Swiss Association (‘Verein’) which provides open network identifier infrastructure. It serves as a neutral steward for the Public Ledger of Credentials (PLC) system” plcred.org

The State of Devs 2026 survey results are out! 2026.stateofdevs.com/en-US/ Here's a quick recap 🧵

Oh this is nice! Can even bring back IE data if you really, really have to.

Took a bit of inspiration from npmx and added a chart to developer-signals.dev showing total upvotes over time This one's for the Temporal API. I love how you can see little surges in developer interest, first in December and again this month.

This is a lovely post. I'm quite often asked if people from different browsers argue with each other in CSS meetings. I usually say it's a lot more "huh... yeah that's not good ... how do we fix it?" That's especially true when it comes to the sort of situations described here.

Tyrannosaurus xkcd.com/3300/

how did I make it so long without knowing about 乖乖

I want Custom Attributes to exist - think Custom Elements (Web Components) but Attributes. I've been working on a proposal, specs, and now a polyfill: www.keithcirkel.co.uk/custom-attri... More coming soon!

Found a conventional use for atproto (replacing high school state associations/athletic conference/school sports websites) the other day and built a spec because I couldn't help myself. it's live but I'll share a blog post about it before sharing

Might be one of my more controversial posts: "The case against JPEG XL" Link: giannirosato.com/blog/post/ca... 🫡 #compression #jpegxl #av1

Can we please stop doing this? I made a comic about it and everything!

I'm worried about the web. I don't want to live in a world where most users of internet-connected devices consume their information and accomplish their tasks via a chatbot interface.

If you've ever tried using a new web API in TypeScript, you've probably hit this problem: An API exists. It works in your browser. But TypeScript has no types for it. The reason is a limitation that TS unfortunately applies to its built-in libs. BUT, I've created a relatively simple fix 👇

#CSS `progress()` is now baseline! 🥳 I was trying to see if this could be used as a workaround for the lack of typed arithmetic (unit division) in Firefox, and it does work, sort of. codepen.io/editor/maike... (And yes I know there's already the `tan2(atan())` trick, but that has its own bugs.)

This has been a long slog; getting the web-as-app-store use-case nailed has taken extraordinary care and years of iteration. Congrats to the team!

You should try out microsoftedge.github.io/Demos/pwa-in...! It feels like a huge step forward for web apps. Kudos to @diekus.bsky.social, Lia Hiscock and others on the Microsoft Edge team driving this! Explainer: github.com/MicrosoftEdg...