gilbertococchi

If you're using AI to build for the web, your tools are missing a critical layer—until today. 🚀 The Modern Web Guidance plugin has arrived across most AI coding tools like: • Antigravity • Claude Code • Copilot • Codex • Cursor • Grok CLI • Kimi Code • WebStorm

Huge milestone for Cloudflare RUM (aka Web Analytics) today! @nicj.net completed his first major update: support for the Soft Navigations API 🎉 🎉 🎉 see: developers.cloudflare.com/changelog/po... Hat-tip to @tunetheweb.com, @mmocny.com and @yoav.ws for their work and support on the API 🧡

Normally we verify email addresses by sending users an email, making them open their inbox, find the email, and click a link to return. Friction at every step. What if it could be this easy?

The first part of Declarative Partial Updates (`<template for>` out-of-order HTML) is now available, unflagged, in Chrome 150!! developer.chrome.com/release-note... The second part (the new JS setting APIs, include the streaming ones) we're still working on the spec side, but maybe for Chrome 152?

My talk on Modern Web Guidance is up! youtu.be/bo3i0FzDUYo This talk is a deep dive into how Modern Web Guidance works and why it's useful. 👉 Make sure you watch until the end, where I show some live demos that really highlight this tool's capabilities!

Level up your AI coding agents! 🤖 Modern Web Guidance brings expert-backed, evergreen skills to your workflow so you can build better web experiences faster. 💻✨

I say it every year - if you're even the least bit interested or involved in web performance, this is THE place to be every year. It's the one trip I prioritize my travel budget for. The talks are awesome, but the hallway track is unbeatable. The concentration of experts in one place is insane.

Chrome 144 introduces a new `<geolocation>`HTML Element to implement more impactful user location permission request flows. The new element serves multiple purposes, from location sensor access request as well as providing access to location data without the need to call the Geolocation JS API.

Signal API is now available on Chrome for Android. A user deletes their credential on the website, but the passkey remains in their passkey provider. The next time they try to sign in, the passkey provider offers a passkey that no longer works. A sign-in attempt will fail and this isn't ideal.

🎙️LET'S GET READY TO RUMBLE! It's been one of DevTool's most requested features… weighing at eiiighty-five votes… 10 years in the making… entering the ring from Chrome 144… Heeeerre's: Individual request throttling!!! developer.chrome.com/blog/throttl... 🥊 It's a knockout! The crowd does wild! 👏🙌🎉🥳

Great to see Banking Apps adopting Passkeys for a passwordless and more secure future! PS: Passkeys can be shared across web and app, making login seamless across channels (web to app or viceversa) by using the Digital Asset Link JSON!

December is here (in a few hours in my timezone), which means the Web Performance "Advent" Calendar is back for its... 17th Edition! One article a day in the month of December. Be a part of it and contribute an article: calendar.perfplanet.com/contribute/

Stop guessing and start debugging responsive styles automatically with Chrome DevTools MCP → goo.gle/3IPT2No Learn how a coding agent can find a visual bug on a specific device size, analyze the source code, update the CSS, and verify the fix with a live browser screenshot.

“Added preview support for Event Timing API (Interaction to Next Paint)” #webperf #CoreWebVitals

It's a bit of a surprise to me, but there are still tickets available for performance.now(), the most important web performance conference of the year: perfnow.nl I'm booking my travel, and hope to see you in Amsterdam next month!

Announcing Chrome DevTools MCP! 🚀 Connect your AI coding agent to Chrome's powerful automation & debugging capabilities with ease. Learn more: developer.chrome.com/blog/chrome-...

Upvote this feature for Interop 2026: github.com/web-platform...

MDN just added a new section in the WebSocket API guide called "Working with the bfcache". Check this out if you are using WebSocket, you may be blocking BFCache and making user experience worse! developer.mozilla.org/en-US/docs/W...

If you thought we were done with View Transitions, guess again! A feature Chrome is working on, is “Scoped View Transitions”, which allow you to scope a VT to a subtree of the DOM. This unlocks things like concurrent transitions and prevents layering issues. developer.chrome.com/blog/scoped-...

This is happening today in ~3hrs. @weston.ruter.net joins me to discuss benchmarks as well as performance updates made on the #Wordpress Core platform. Join us! ✨ SPDY STREAM 009 ✨ 🗣️ Westin Ruter 📆 Wednesday September 10th, 2025 ⏰ 1pm EDT, 10am PDT 🔗 bit.ly/spdy-stream-...

🆕 The 202508 Chrome User Experience (CrUX) release is now live on BigQuery! Check out the announcement post for the full info: groups.google.com/a/chromium.o... Highlights below 👇 🧵 1/3

Did you know Cross-Document View Transitions are being used in production on Google Search? developer.chrome.com/blog/google-... is a case study I co-authored with one of our engineers from the Google Search UI team.

performance.now() is coming to Amsterdam this October! This event is great both for the inspirational talks as well as for the opportunity to meet folks from different companies and backgrounds to discuss how to successfully tackle web performance challenges!

Very exciting news. With these changes, you can more easily build accordions such as seen in this recording. developer.chrome.com/blog/styling... Currently supported in Chrome and Safari, and soon Firefox!

performance.now(), the web performance conference, 30th and 31st of October, Amsterdam. Single track, the best speakers in the industry, plenty of your performance-mad peers around to have fascinating conversations. What's not to like? Let's introduce our speakers ... perfnow.nl

The Chrome DevTools Performance panel just leveled up! 🚀 Here's a 69-second taste of the new hotness.

BFCache can hugely influence your page performance for URLs high on Back Forward Navigation types. If you use CrUX or RUM and you see a lot of traffic in % attributed on Back Forward and few on BFCache maybe you are leaving money on the table! CruXVis can help you measuring this opportunity!

The one where I muse about how this simple bit of code radically changes how the web itself seems to behave… webkit.org/blog/16967/t...

We've just published v5.0.0 of the web-vitals JavaScript library for measuring Core Web Vitals. github.com/GoogleChrome... As a major release, this includes a number of breaking changes as detailed in the upgrading doc: github.com/GoogleChrome... Please read carefully before upgrading. 1/5 🧵

We're updating Lighthouse to be based on the same Insights we recently launched in the Performance panel of Chrome DevTools. developer.chrome.com/blog/moving-... This will help align the tools but will be a breaking change. So we'll make that change in Lighthouse 13 in 6 months. 1/3 🧵

WordPress 6.8 is out today. Including Speculation Rules in Core thanks ot some amazing work by @felixarntz.bsky.social !! make.wordpress.org/core/2025/03... It's a very conservative prefetch-on-mousedown default but site owners (or plugins) can customise that: make.wordpress.org/core/2025/03...

Alternatively, the CrUX History APIs are free and you can build your own dashboards as you see fit. There are also LOTS of great CrUX tools out there — many with a free offering to view history such as Treo, Calibre...etc. So that's another option.

🎥 The videos from our last meetup are now live on our YouTube channel! Here's the playlist: www.youtube.com/playlist?lis... Big thanks to @keerthanak17.bsky.social and @webx.bsky.social for speaking! ❤️ #webperf

In case you missed it cause you had better things to do on a Friday evening 🤷‍♂️, I wrote a detailed post on how to roll out speculation rules on more complex sites. Check it out.

www.lifestylemind.com/healthy-life...

Yay! new CrUX API goodness! LCP Type and Image Subparts are now available!, so I've added them to my free CWV History Tool here: tamethebots.com/tools/cwv-hi...

Awesome #CrUX update by the people from #Google (and also partially available in our free tool as well) 👏 This was added: → LCP image subparts → LCP resource types → Round Trip Time (RTT) tri-bins → RTT p75 and histograms We added #LCP resource type already as well (see attached). 1/4

We don't have an official CrUX Bluesky account, so for the moment I'll announce the monthly releases. And we're starting with a big one! 🆕 The 202501 release is now live on BigQuery! Check out the announcement post for the full info: groups.google.com/a/chromium.o... Highlights below 👇 🧵 1/10

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! 🥳

With the start of 2025, the WordPress Core Performance Team is looking for 2 new Team Reps to represent the team as part of the broader project. If you want to nominate someone or volunteer yourself, don't hesitate and let us know in the post comments! 🙌 make.wordpress.org/performance/...

View Transitions Snippets: Getting all Animations linked to a View Transition 🔗 brm.us/view-transit... 🏷️ #ViewTransitions #JavaScript #Animations