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Anne van Kesteren

@annevk.nl
654 followers 111 following 42 posts

Web Standards Engineer at U+F8FF.

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Reposted by Anne van Kesteren
Saron Yitbarek @saron.bsky.social · 01/07/2026
Introducing the new Safari MCP server 🎊 Connect your agent directly to a live Safari browser window so it can find bugs and examine the page on its own. Available in Safari Technology Preview 247. Details here 👉🏽 webkit.org/blog/18136/i... Give it a try and let me know what you think ❤️
webkit.org
Introducing the Safari MCP server for web developers
In Safari Technology Preview 247, we’re introducing the Safari MCP server — a Model Context Protocol server for web developers that makes your web development and debugging workflow faster and more po...
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Firefox for Web Developers @webdevs.firefox.com · 01/06/2026
We're experimenting with a way to visualize session history in Firefox DevTools, and we'd love your feedback! Here's the background, and how to try it: blog.farre.se/posts/2026/0...
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Luca Casonato 🏳️‍🌈 @lcas.dev · 17/06/2026
What's this, a new HTML proposal? Built-in localized time formatting in HTML! github.com/whatwg/html/...
<time datetime="2026-06-17T08:13:41.099Z" format="datetime">
  fallback
</time>
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Marina Aísa @marinaaisa.com · 16/06/2026
This week I'm in A Coruña, Galicia, attending the @webengineshackfest.org 👩‍💻 where we are discussing the future of web engines and standards. Given the potential impact on future web development, I thought it would be helpful to share some of my personal notes from the event. ✍️👇
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John Wilander @wilander.bsky.social · 13/03/2026
I'm hiring to the WebKit Privacy & Adtech team! Help us prevent online tracking/fingerprinting, and design+implement privacy-preserving alternatives for use in advertising. · Systems programming in C++ & Swift · Location: Cupertino · Work that feels good and important jobs.apple.com/en-us/detail...
jobs.apple.com
WebKit Privacy & Adtech Engineer - Jobs - Careers at Apple
Apply for a WebKit Privacy & Adtech Engineer job at Apple. Read about the role and find out if it’s right for you.
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Anne van Kesteren @annevk.nl · 27/01/2026
If you have existential feelings about the state of your software stack, just remember that on the web it’s completely undefined which element a mouse click returns.
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Anne van Kesteren @annevk.nl · 07/10/2025
Evergreen sentiment. (If you always wanted to be a specification editor, wiki.whatwg.org/wiki/Specs/t... has some suggestions. Most still relevant.)
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Jake Archibald @jakearchibald.com · 29/09/2025
Web component folks: A common feature with request is to "inherit from a button". If that's something you want, which specific button behaviours is it you want to inherit? Why is putting a button in the shadow root not the answer?
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Ben Collins @bencollins.bsky.social · 01/07/2025
I got permission to share this, and I'm extremely grateful for that. The Onion got this letter from one of our subscribers in Alaska. She works with dementia patients and decided to leave a copy in the car for each one. This email made my year. Read it and you'll see what I mean. People are good.

I work as an elder and hospice caregiver, which I am oddly passionate about. I can love on them shamelessly and no one complains about my codependence. It's a win-win situation. 

Many of my caregiving colleagues complain about the repetitive questions and, sometimes reactions, of the elderly, especially when those patients happen to read the newspaper, especially with the current downward spiral of our country — as if these people haven't lived through enough horror...

I love my dementia peeps, but sometimes wonder if there's a Guinness Book World Record for how many times an hour a dementia patient can repeat the same question — it's got to be in the hundreds. At least with small children, they ask different questions. Dementia patients will get stuck on one short question and ask it until you can interrupt their train(carousel) of thought and successfully redirect their attention. That carousel is pretty manic sometimes. 

A couple days ago, I picked up my mail from the post office and drove over to the nursing home to take (let's call her "Miss Daisy") Miss Daisy out for a drive. Before we took off on our road trip, to the end of The Road and back, in our landlocked little town (Juneau, Alaska), I set my copy of The Onion down in front of her. 

Over our two-hour excursion, tiny Miss Daisy read that front page at least a dozen times and each time she would snicker, giggle, and guffaw, then put it down on the dash board and, a minute later, discover it anew. I think it was the best afternoon of my life. We don't often hear them laugh and when they do, it's the sweetest thing you've ever heard. 

...

Thank you, thank you, thank you, for the really important work all of you do. You make the world a better place.
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Anne van Kesteren @annevk.nl · 24/06/2025
APNG finally graduated from its MozillaWiki documentation to a proper standard: www.programmax.net/articles/png...
programmax.net
PNG is back!Rec. 2020 and Rec. 709 comparison
After 20 years, PNG is back with renewed vigor! A new PNG spec was just released.
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Anne van Kesteren @annevk.nl · 11/06/2025
If you want to learn more about Declarative Web Push or Web Push in general, my colleague Brady put out a great video: developer.apple.com/videos/play/...
developer.apple.com
Learn more about Declarative Web Push - WWDC25 - Videos - Apple Developer
Learn how Declarative Web Push can help you deliver notifications more reliably. Find out how to build on existing standards to be more...
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Anne van Kesteren @annevk.nl · 07/05/2025
🥳 We added new attributes to HTML to enhance <input type=color>: webkit.org/blog/16900/p...
webkit.org
Add wide gamut P3 and alpha transparency to your color picker in HTML
Now HTML lets you create a color picker for wide gamut P3 color and for alpha transparency with two new attributes: <input type="color" colorspace="display-p3" alpha>, available today in Safari 18.4.
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Jen Simmons @jensimmons.bsky.social · 02/05/2025
If you write code to make websites (HTML, CSS, JS, Web API, Media) and you get frustrated trying to wrangle your code to work in Safari, which bugs are blocking you? Which existing features would you most like to see improved? If you got a chance to order priorities which effort would you put first?
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Ryosuke Niwa @rniwa.bsky.social · 28/02/2025
Please don't publish / release a polyfill for unshipped Web features. Someone is bound to use it in production and ruin it for everyone else.
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Anne van Kesteren @annevk.nl · 27/02/2025
And yet another polyfill appears to have poisoned the standards well. This time for scoped custom element registries. People never learn. 🫠
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Anne van Kesteren @annevk.nl · 23/01/2025
I have at times told people that if you want to generate XML, you should use a serializer. So when I had to generate a serialized CSS URL value containing a data: URL of an SVG document of which colors could vary, I immediately went for string manipulation and concatenation. 😅
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Web Engines Hackfest @webengineshackfest.org · 20/01/2025
📅 Save the dates! The Web Engines Hackfest 2025 will take place June 2-4 in A Coruña, Galicia (Spain). Check more details at: webengineshackfest.org
webengineshackfest.org
2025 Web Engines Hackfest
Web Platform community event for people working on the different engines (Chromium/Blink/V8, Safari/WebKit/JSC, Firefox/Gecko/SpiderMonkey, Servo, Ladybird), on the testing side (WPT, Test262), or on ...
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Anne van Kesteren @annevk.nl · 06/01/2025
The aliens are coming and their goal is to invade and destroy Earth.
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Anne van Kesteren @annevk.nl · 19/12/2024
Almost time to sign off for the year. Web standard proposals to finish in (early?) 2025: - Declarative Web Push - Scoped Custom Element Registries - HTML (and SVG & MathML) Sanitizer API - moveBefore() - fetchLater() - float16 in 2D canvas - <button command> and quite a few more. Happy holidays!
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Anne van Kesteren @annevk.nl · 18/12/2024
git blame as visualized by GitHub (or Searchfox for the HTML standard) is an amazing development tool for projects that span decades. In particular for projects that enforce good commit messages. Being able to answer why something is the way it is, can be crucial when changing it.
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Ryosuke Niwa @rniwa.bsky.social · 14/12/2024
@annevk.nl and I worked on a refined proposal to untie scoped element registry from shadow DOM so that you can use a scoped registry without shadow DOM. Your feedback is appreciated: github.com/whatwg/html/...
github.com
Revamped Scoped Custom Element Registries · Issue #10854 · whatwg/html
https://github.com/WICG/webcomponents/blob/gh-pages/proposals/Scoped-Custom-Element-Registries.md is a good proposal, but it ties the functionality too much to shadow roots. This is Ryosuke and I's...
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Jen Simmons @jensimmons.bsky.social · 20/11/2024
We implemented a new value for `background-clip` called `border-area`. It lets you use CSS fill a border with a background image or gradient. This article explains how it works, and shows up the possibilities in 7 demos. #css #webdesign #webdevelopment #graphicdesign webkit.org/blog/16214/b...
webkit.org
Make creative borders with background-clip border-area
How’d you like to use CSS to easily create a border from an image or gradient?
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Anne van Kesteren @annevk.nl · 03/12/2024
The increased URL interoperability between browsers motivated me to do another pass at the remaining open issues. Fully solving file: URLs and URL parsing overall feels within reach for 2025. The IDNA BiDi issue depends on Unicode, but it is scheduled for Unicode 17.0.
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Anne van Kesteren @annevk.nl · 30/11/2024
This seems like a great idea at first, except that it is very ASCII-compatible-alphabets-centric and ASCII has confusables as well, e.g., l vs I. Passkeys are the answer.
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Anne van Kesteren @annevk.nl · 29/11/2024
After working on URLs for well over a decade, we finally hit a point where real browser convergence on core aspects is happening. Experimental browser builds are at ~96% (Chromium), ~99% (Gecko), and ~100% (WebKit) in Interop 2024’s URL category. Very exciting to see! Kudos!
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Keith Cirkel @keithamus.social · 25/11/2024
www.keithcirkel.co.uk/100-patches-... 100 patches to 5 browsers in 18 months.
keithcirkel.co.uk
100 patches to 5 browsers in 18 months
I went on a journey to contribute more to browsers, here's that story.
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Jen Simmons @jensimmons.bsky.social · 22/11/2024
Just look at that Interop 2024 score… wpt.fyi/interop-2024
Screenshot of dashboard scores — Chrome 99, Edge 98, Firefox 99, Safari 99
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Anne van Kesteren @annevk.nl · 22/11/2024
It seems chain letters are still alive somehow.
The Slackers on stage in Berlin.
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Anne van Kesteren @annevk.nl · 22/11/2024
If your website does its own video controls, please adopt the :volume-locked pseudo-class to determine whether to offer volume control. Notably iOS and iPadOS manage their volume globally.
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Emily Stark @estark.bsky.social · 15/11/2024
My colleague @serena.nz gave an amazing PurpleCon talk describing the behind-the-scenes experience of removing the (in?)famous lock icon from Chrome: www.youtube.com/watch?v=iUAx... One day I aspire to get as many laughs during a talk as a 90s sitcom laugh track 🤩
youtube.com
"🙋❓🙋 why❓🤔 chrome 🌐 🙅🚫 removed 🚫🙅 the 🔒 lock 😮 icon 🤷🤷" - serena chen (purplecon 2024)
YouTube video by purplecon
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Anne van Kesteren @annevk.nl · 12/11/2024
In London for the HTTP Workshop. 🎡
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Anne van Kesteren @annevk.nl · 11/11/2024
Please help me complete this Bluesky WebKit starter pack: go.bsky.app/784yHbN
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Anne van Kesteren @annevk.nl · 08/11/2024
Finally had some time to review WHATWG HTML Standard PRs. A lot of exciting technology in the works: <button command commandfor>, ShadowRealm, enforcing noopener for cross-top-level-site blob: URLs, <dialog closedby>, a completely revamped <select> element, and then some.
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