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Oh good! Excellent news for a change. Who said the independent publication is dead?

Serbia ✅ Brazil ✅

Would you like to but CSS Day 2027 tickets ON THE 2026 BUDGET? That's possible; we're even working with a few companies to do that. Just let us know: cssday.nl/contact.html

📢 I need 160 more web developers to answer 1 important question. How do you interpret the "Fully Supported" label on MDN support tables? Let me know in the survey below and tell your web developer friends to answer too 🙏🏾 github.com/lolaslab/acd...

The number of connection address and protocol combinations keeps growing, and every browser behaves differently. With Happy Eyeballs v3 browsers will fall back to a working option faster and more safely. This session will show what its performance impact looks like. Max Inden at perfnow.nl

Well, then it's time for some anniversary festivities! Let's start with a modest 🎉 and see if it leads to a 🥳

Also, it occurred to me that, while AI can write my article if I give it notes, it cannot do fundamental browser compatibility research.

A site called Down Detector, where I saw there are indeed problems with my email host: "Don't miss the next outage! Create an account!" Well ... if it's all the same you ...

In this deep-dive session, Tim will use real-world data and performance metrics to show how scalemates.com became the fastest and largest scale modelling website in the world. You’ll leave with practical, actionable insights to push performance even further. @timvereecke.bsky.social at perfnow.nl

The provisional SCHEDULE is live; changes still possible. perfnow.nl/schedule.html

Could you do me a favour? If you have access to site analytics, please tell me what percentage of iOS visitors are in landscape mode. For now I just need the percentage. I'll get back to you if the percentage is interesting. Thanks!

Small changes can mean death by a thousand cuts for your performance. This talk is about what Risko learned about regressions, where the numbers lied, unrealistic throttling, and why "LCP doubled" isn't always bad news. You'll leave with a tester's view of web performance. Risko Ruus at perfnow.nl

What if we could provide websites that have the ability to do their thing while being offline? In this talk, I’ll show you how I’ve harnessed the native web APIs to implement offline capabilities while minimizing the amount of Javascript to execute in the browser. Aleth Gueguen at perfnow.nl

Could you do me a favour? If you have access to site analytics, please tell me what percentage of iOS visitors are in landscape mode. For now I just need the percentage. I'll get back to you if the percentage is interesting. Thanks!

Getting web performance prioritized is the hard part. I will talk about this topic on @perfnow.nl. How do you make the case for web performance? → Share your experience in this 3–5-minute survey: pagespeed.one/en/perfnow 🙏 #WebPerf #WebPerformance #PageSpeed

I wouldn't happen to know someone who works for PUFFIN, would I? I have a few questions (mostly why my test page doesn't work at all, not even the CSS.)

Designers see performance as a constraint, or as a checklist item: “don’t forget the spinner.” What if we saw it as a design opportunity instead? This talk explores what developers should expect from their designers and how to ask for it. @stephaniewalter.bsky.social at perfnow.nl

Wait, wasnt' there a fairly recent new property for Chrome/Android that said 'stop fucking about with font sizes and actually do as I actually tell you'? In other news, I'm starting to remember why viewport tests were such a pain.

Anyway, I just made the first official entry in a compatibility table in about nine years.

And Chrome on iOS is such an almighty fucking obnoxious piece of shit that I removed it. Will try Vivaldi now for my WebView tests.

Mobile Core Web Vitals are being built with real user data, and are tied to both business impact and a specific fix. But a lot doesn't transfer from the web: LC assumes a page load, CLS a document. This talk shares the first public look at Mobile CWV. @cliffcrocker.bsky.social at perfnow.nl

Doing viewport tests for the first time in ten years. The basics haven't changed. window.innerWidth/Height still measure the visual viewport in Safari, as it once did in every browser. And who decided that visualViewport.width should be a float? I mean, who cares about sub-pixel stuff on mobile?

Mucking about with mobile browsers For the first time in nine years I created a test suite of two phones. A few things caught my interest - especially UC supporting zoom reflowing, my favourite mobile feature. www.quirksmode.org/quirksblog/2...

How do people test in Chromium WebViews nowadays?

Bought a test phone for the first time in ten years. A second-hand Galaxy S21.

Does anyone know of an Android app that uses the Android WebView to render pages and has a basic browser interface? (URL bar, Back button, Reload button.) For the first time in 10 years I have to do some compatibility testing, and I currently can't access Android WebViews.

Why is speed so hard to sell? Martin will look at where familiar arguments fail, what WebPerf can learn from SEO, and why ownership and incentives matter as much as metrics. You will leave with practical tips to turn performance into prioritized work. @machal.bsky.social at perfnow.nl

If we look at a few decades of web performance, what technologies and techniques worked, what didn’t, what made the most difference, what has stood the test of time? Making a fast website is challenging enough; keeping a website fast is harder! @adactio.com at perfnow.nl

Decline and Fall of the Roman Bagel. 5 out of 5 stars. No questions. Perfection achieved.

Here, a demo that compares the 4 values: codepen.io/editor/bramu... (`chain` is new; Chromium only for now)

What was the thingy again that prevents your scroll actions from leaking out of a container? I even forget if it was CSS or JavaScript.

x.querySelector chooses elements inside of specifically x. If you want to select a dialog containing x (dialog:has(&)), `x.closest("dialog")` is the way to look up the dom tree from x

What might be useful is x.querySelectorAll('dialog:has(&)') where & refers back to element x.

The cost of AI The tech giants are creating a system with the appeal of a 19th-century factory without delivering the sole benefit: cheaper stuff. Ask what the true cost of the tokens would be. Nobody knows, but raising awareness is a good idea. www.quirksmode.org/quirksblog/2...

And I went shopping between the blogging about AI and the fixing of image galleries on conference sites ... and forgot the most important thing: a new Android. Ah well. If it works in Chrome/Mac and Safari/iOS I think it'll work on Chrome/Android and Samsung/Android.

The cost of AI The tech giants are creating a system with the appeal of a 19th-century factory without delivering the sole benefit: cheaper stuff. Ask what the true cost of the tokens would be. Nobody knows, but raising awareness is a good idea. www.quirksmode.org/quirksblog/2...

I am simultaneously discussing the current state of the @perfnow.nl venue, explaining the boys about the coronations of Charlemagne and Napoleon, and solving a Safari/iOS bug. I'm not sure when any of it will be done. And I almost forgot to publish the short blog entry I wrote yesterday.

What if there was a Web Components conference?? @stuffbreaker.bsky.social and I are teaming up to get a little more serious about the idea of getting one together. We want to gather data on if there is interest in the community forms.gle/ZGqtYGj7V6q8... Please fill out and share to anyone!

Reminder: tickets get more expensive onThursday. There are only nine tickets in the middle bracket left. perfnow.nl/tickets.html

We also add Max Inden about quic HTTP/3 bsky.app/profile/scot... about the path to standards bsky.app/profile/timv... with a case study Come join them at perfnow.nl

Oh dear, speakers are being announced in carload lots! Today we add bsky.app/profile/clif... about Core Mobile Vitals bsky.app/profile/jpam... as our second MC bsky.app/profile/mach... about selling web performance Come join them at perfnow.nl