performance.now() is coming! As tooling improves, is performance testing becoming any easier? @csswizardry.com, who spends every day auditing client projects,, thinks confusion has increased. Let's ensure that every test we run has a purpose and gives us useful data. perfnow.nl/speakers.htm...

Today our congregation of faithful will sing the psalm What An Incredible Piece Of Shit Gimp Is

performance.now() is coming! @tammyeverts.com asks a seemingly-simple question: How Fast Is Fast Enough? She'll touch on questions — ranging from neuroscience to business metrics — to get you thinking about how you create, measure, and report your performance goals. perfnow.nl/speakers.htm...

justify-self on arbitrary elements is Chrome only for now, correct?

Re-aligning my business goals ... stand by ...

performance.now() is coming! Signal-based fine-grained reactivity works great, but @rich-harris.dev feels there's more to performance than updating the screen at 60 fps. We'll learn about new approaches that help you build fast, reliable, data-efficient apps. perfnow.nl/speakers.htm...

A car just went by that said "Transforming Future Coolness". It sounds great, but I don't know what the product would be. Or is it an experience?

performance.now() is coming! @marcysutton.com explains how designing for accessibility contributes to better experiences, and why subtle choices — like which elements receive focus — lead to better products. She’ll also talk about the legal context in Europe. perfnow.nl/speakers.htm...

performance.now() is coming! @ethangardner.com will offer practical tips on presenting engineering data as a competitive advantage, a revenue driver, and a tool for enhancing user experience to help make performance optimization a strategic priority. perfnow.nl/speakers.htm...

performance.now() is coming! @webx.bsky.social [] will explain how he built a Performance AI assistant and agentic workflow on top of a fork of Chrome DevTools. Few AI systems can reason with the complex reality of performance data. Learn how to solve that. perfnow.nl/speakers.htm...

performance.now() is coming! @adevnadia.bsky.social will provide a deep dive into the new React Server Components. How does the app render in the browser? What are their performance implications? How do they compare to traditional SSR and CSR techniques? perfnow.nl/speakers.htm...

onDomContentLoaded, Firefox recognises document.querySelector(':target'). Chrome and Safari do not.

performance.now() is coming! The night before the conference, 29th of October, Mozilla organises performance.sync(), the pre-meetup where you can meet your peers to mentally prepare for two days of information overload. They're also looking for a few people to present. https://luma.com/ziykhh4y

performance.now() is coming! The night before the conference, 29th of October, @mozilla.org organises performance.sync(), the pre-meetup where you can meet your peers to mentally prepare for two days of information overload. They're also looking for a few people to present. luma.com/ziykhh4y

First time I prepare a D&D session entirely with Flee Mortals monsters. Let's see how they compare to MM-2024 monsters.

Status: hangover slowly disappearing. Don't ask.

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? https://perfnow.nl/

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

TIL: You can put a text input inside a <button>. Works absolutely fine.

Wow. I just logged back into Amazon Prime and had to reset my password. That went fine, but now I got one of those warning mails about someone doing something to your account, but it's from amazon.co.uk (which has nothing to do with primevideo.com in NL, I'd say)

“I don’t like CSS” is coded speech for “I never learned CSS”

Hype is a business tool. Too many #UX folk don't know about the Gartner Hype cycle. Even those that do don't understand how it's being used to manipulate us, making our discussion of #genAI so complicated and scary. This is my attempt to calm things down a bit. jenson.org/hype/

Last night in Greece. Back home tomorrow.

Reading the saga of Ragnar Loðbrók. Fun fact: the king of Sweden had a cow that could cast both Confusion and Fear, provided enough sacrifices were made to it. Unfortunately the saga doesn't say what kind of sacrifices.

At Schiphol for my holiday flight to Greece. Despite the holiday throngs I nearly equalled my record of 50 minutes home to gate, mostly because there was no security queue.

Explained the basics of SEO to a third-generation comics seller (and marketing student)

I hope that one day someone will explain the difference between FOSS and libertarian Valley Big Tech to me. From where I’m standing, they seem like two sides of the same medal in that no one should ever pay a reasonable price for anything.

Oh look, my Pay the Web Forward presentation from April is live. youtu.be/MoBwmMoowcE

Oh look, my Pay the Web Forward presentation from April is live. youtu.be/MoBwmMoowcE

Lots of new speakers added. 2025 starter pack created. Time to get this show on the road. perfnow.nl go.bsky.app/3tyzfGe

Oh wonderful. So I have a bunch of .local 'domains' internally in my network to edit and test a bunch of sites. Today it turns out that Safari/iOS just flatly refuses to follow .local URLs because it's reserved for gobbledygook. #pissOff

This should be a UX measurement: for how long can you use a piece of software without it starting to talk about itself? The longer, the better the UX.

He's at 3999 ...

Again sitting outside at #jsnation Maybe an interesting conversation will be had; maybe I'll just digest my hamburger.

Sitting outside in the sun at #jsnation .

Already saw @sachagreif.com and Vinicius Dallacqua. Now I'm just barely in time to see how @infrequently.org 's message lands at #jsnation.

At #jsnation . Because I haven’t been at a conference for days.

Home. Now rest for the entire weekend. #cssday

That concludes CSS Day 2025 #slightlyTired

CSS Day 2026, next year: 11th and 12th of June, 2026, Amsterdam Watch the 2025 videos via cssday.nl/live-stream....

"Writing tidy and non-chaotic CSS is a skill", says Ana Rodrigues at #cssday I know .... I never mastered it.

I'm glad that Dutch political life starts to adjust to my conference calendar. Government fell three days before #cssday. That necessitated new elections, which will take place the day before #perfnow.

Let's hear it for our captioner Amanda, who's awake at stupid o-clock to help out #cssday!

https://cssday.nl/schedule.html lists all of today's wonderful speakers And remember, the #cssday live stream is at https://cssday.nl/stream

cssday.nl/schedule.html lists all of today's wonderful speakers And remember, the #cssday live stream is at cssday.nl/stream

Principle 3: code without coding. We can respond to user preferences set in the OS. Just a couple of lines of CSS and now we have a light and dark theme. Use em to make things like heading sizes relative to the size of text in an article. #CSSDay

Equally, we could use logical properties to support right to left languages without any effort. You get more by doing less!! #CSSDay

Principle 2: Less and less Take things away. There's so much power in new CSS features. We could specify loads of CSS colours but instead why don't we specify one base colour and then do things like change lightness with the new colour functions. #CSSDay

Getting throwback vibes from @johnfallsopp.com talking about 2000-era web at #cssday Someone should do a talk about all the cutting edge hacks we were using back then like 9-slice buttons, clearfix, table layouts, frames…