Compression dictionaries is now an official RFC! www.rfc-editor.org/rfc/rfc9842....

I'm proposing a change to iframes that will allow child frames synchronous access to data attributes on the parent frame. Let me know your thoughts: github.com/blittle/ifra...

✨ SPDY STREAM 011 ✨ w/ @krzksz.bsky.social & @yoav.ws After deploying the SPECULATION RULES API to their merchants, they join me this week to discuss the experience and their findings. Join us! (updated day and time) 📆 Thursday Sept 25 ⏰ 11am EST, 5pm CEST 🔗 bit.ly/spdy-stream-011

@lukewarlow.dev I just discovered github.com/whatwg/fetch... thanks to @jakearchibald.com Something like this has been a recurring request at the WebPerfWG, beyond `fetch()` github.com/w3c/resource... It'd be great if this could cover both!

📝 Fetch streams are great, but contrary to popular belief, they're not good for measuring upload/downloading progress. ⬇️ Here's why, and how to avoid the gotchas ⬇️ jakearchibald.com/2025/fetch-s...

Great post and it's been a pleasure helping @krzksz.bsky.social and @yoav.ws get this working on Shopify. performance.shopify.com/blogs/blog/s...

Starting my new role on Monday. Could be anywhere.

today is my 40th birthday. to toot my own horn a bit, I'm the happiest, healthiest, and most successful I've ever been, so I'm going to indulge myself and do one of those "40 things that made me who I am" threads so buckle up (or mute me for the next little bit 😆)

Blink: Intent to Implement and Ship: Http cookie prefix

CSS uses a complex algorithm to decide how to animate transforms. If you get it wrong, as many folks do, you end up with an unnatural animation. Here's how it works, and how to avoid the pitfalls. jakearchibald.com/2025/animati...

In case anyone out there is looking for a good-first Chromium bug, issues.chromium.org/issues/42421... is one I'd be happy to mentor someone through..

What do y'all think of reviving <img lowsrc>? (as a data URI, used until the real image loads)

Great video! Hoping my “Bug Fixes” PR mentioned at 24:20 can make it into WebKit soon 😊

✨ How We Contribute To Browser Standards ✨ by @yoav.ws The 3rd of the presentations from the #SPDYmeetup 003. 🔸 Yoav shares how his career working on browsers and for browser vendors has now brought him to Shopify, enabling him to address possible shortcomings in standards 🎥 youtu.be/VEYxyNxfqG8

My take on coding LLMs: they have no understanding of concepts and just do pattern matching. But pattern matching goes a looooong way

✨ Speculation Rules, and Their Effect on Shopify Stores ✨ by @krzksz.bsky.social 🔸 As part of the Growth Services team, Mateusz talks about the team's long journey to implement Speculation Rules at Shopify and, the lessons learned along the way. #SPDYMeetup 🎥 youtu.be/8k2cGNjwJ3c

Avoiding the fomo this year by eagerly being a part of #perfnow in 2025. Tickets on sale now to help you avoid that fomo too. perfnow.nl/speakers.html

Forget the G7 ❌, this was the SPDY6 ✅: 🇵🇱🇺🇸🇪🇸🇨🇦🇬🇧🇫🇷. An assemblage of great global minds for last night's #SPDYmeetup in Toronto. Everything was as stellar as could be. @guaca.bsky.social @yoav.ws + @krzksz.bsky.social all delivered poigant presentations! 🏁 Recordings to be shared shortly. ✨🙏🏾✨

Import maps are a great way to minimize cache invalidation in your module tree. But up until recently, they had a ton of sharp edges. So we fixed them!! shopify.engineering/resilient-im...

@zachleat.com here's that blog post I promised shopify.engineering/resilient-im...

Would web devs use this? - subscribe to highly anticipated features (like Temporal) - get notified when they land in a new browser / become Baseline - via email, bsky, GitHub, Slack, whatever

📢 We Announced speakers for the TORONTO SPDY MEETUP 003: Performance At Shopify: Estela Franco 🇪🇸, Yoav Weiss 🇫🇷 and Mateusz Krzeszowiak 🇵🇱 will walk us through how Shopify is doing their part is helping merchants be fast, and STAY fast. 🎟️ JOIN US bit.ly/spdy_toronto_003

Latest Chrome (and Safari I think?) implement multiple import maps, which I think enables this behavior (thanks @yoav.ws ) I don’t think you have to do document.write() tricks to get it working, just inline it in html.

Imagine being a software developer named Claude

If you ever wanted to use `sizes=auto` and were bummed out about Safari/Firefox support, Shopify now got a polyfill for ya! github.com/Shopify/auto...

My process for writing blog posts using LLMs: * Outline the points I want to make * Ask an LLM to fill in the blanks * Start reading what the LLM wrote and throw it away because it's mediocre garbage * Write my own thing

The DOJ proposal would have extremely negative consequences for the web. The OWA folks propose a significantly better alternative

Someone hire this guy. He's one of the best. Hire him before someone else does.

BlinkOn prep

I can’t seem to quite find anything definitive - is it standard to just not animate a loading spinner at all if prefers-reduced-motion is set to reduce?

Safari Tech Preview 215: Added support for Trusted Types 🎉 webkit.org/blog/16523/r...

Blink: Intent to Prototype: Delete-Cookie header

Can't recommend it enough! I started my OSS adventures a lifetime ago with Google Summer of Code creating a Boost C++ library. I had zero Open Source experience, and it was fantastic to do the first steps with the program structure and a mentor guiding and encouraging me. Don't be afraid and apply!

The mountains are nice

I wrote a thing for the Chrome Developer Bog; introducing popover=hint. developer.chrome.com/blog/popover...

The Delete-Cookie header proposal is not dead and there is now an internet-draft for it: https://yoavweiss.github.io/delete-cookie/draft-deletecookie-weiss-http.html

I wanted this to happen for a ~decade

Blink: Intent to Ship: Partitioning :visited links history

LCP and INP are in Interop 2025!!!! web.dev/blog/interop...

Reminder that this changed rolled out in Chrome 133. If you’re seeing worse LCP times and load your LCP images from another domain (and didn’t have the TAO header set) then that could be why. Read the full thread for details.

Yay! 🎉

attention nuxt users! 👉 I'd love your thoughts on this RFC for built-in content security policy support ... from our very own @jacobandrewsky.bsky.social ❤️

Coolest thing ever🤩, our Baseline integration into RUMvision got featured as a use case web.dev/case-studies... Not something I could have predicted when we started our startup 3 years ago, and was looking through web.dev as a source of info, which makes this even cooler! 🥳

Oracle justified its JavaScript trademark by claiming Node.js — now it wants that ignored #FreeJavaScript deno.com/blog/deno-v-...

Building secure web apps shouldn't be a burden. We've built a high-assurance web framework at Google that makes security easy for developers. Learn about our "Secure by Design" approach and how it works in our new blog post: bughunters.google.com/blog/6644316... cc: @ddworken.bsky.social

With a rigorous A/B test, Rayban was able to prove that pre-rendering could reduce their LCP by over 40%, leading to a DOUBLING of their conversion rates! If you are not measuring the impact of web performance on your business, you are probably leaving money on the table! web.dev/case-studies...

We all flourish in Open Source thanks to people like @danielroe.dev. Anti zero sum games club ♥️

5 years in, I'm still thinking about how we can enable streamed execution of ES modules: docs.google.com/document/d/1...

"Iterate quickly on a slow-moving platform" - great post by @csswizardry.com csswizardry.com/2025/01/buil...