Reposted by Anne van Kesteren
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 ❤️
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 ❤️
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...
webkit.org
July 1, 2026 at 9:36 PM
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 ❤️
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 ❤️
Reposted by Anne van Kesteren
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...
Here's the background, and how to try it: blog.farre.se/posts/2026/0...
June 1, 2026 at 2:08 PM
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...
Here's the background, and how to try it: blog.farre.se/posts/2026/0...
Reposted by Anne van Kesteren
What's this, a new HTML proposal?
Built-in localized time formatting in HTML!
github.com/whatwg/html/...
Built-in localized time formatting in HTML!
github.com/whatwg/html/...
June 17, 2026 at 10:18 AM
What's this, a new HTML proposal?
Built-in localized time formatting in HTML!
github.com/whatwg/html/...
Built-in localized time formatting in HTML!
github.com/whatwg/html/...
Reposted by Anne van Kesteren
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. ✍️👇
Given the potential impact on future web development, I thought it would be helpful to share some of my personal notes from the event. ✍️👇
June 16, 2026 at 1:31 PM
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. ✍️👇
Given the potential impact on future web development, I thought it would be helpful to share some of my personal notes from the event. ✍️👇
Reposted by Anne van Kesteren
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...
· Systems programming in C++ & Swift
· Location: Cupertino
· Work that feels good and important
jobs.apple.com/en-us/detail...
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.
jobs.apple.com
March 13, 2026 at 2:51 AM
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...
· Systems programming in C++ & Swift
· Location: Cupertino
· Work that feels good and important
jobs.apple.com/en-us/detail...
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.
January 27, 2026 at 2:17 PM
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.
Evergreen sentiment. (If you always wanted to be a specification editor, wiki.whatwg.org/wiki/Specs/t... has some suggestions. Most still relevant.)
We *really* need a specification for hit testing on the web...
October 7, 2025 at 6:49 AM
Evergreen sentiment. (If you always wanted to be a specification editor, wiki.whatwg.org/wiki/Specs/t... has some suggestions. Most still relevant.)
Reposted by Anne van Kesteren
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?
September 29, 2025 at 12:12 PM
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?
Reposted by Anne van Kesteren
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.
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.
July 1, 2025 at 6:46 PM
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.
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.
APNG finally graduated from its MozillaWiki documentation to a proper standard: www.programmax.net/articles/png...
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.
www.programmax.net
June 24, 2025 at 1:15 PM
APNG finally graduated from its MozillaWiki documentation to a proper standard: www.programmax.net/articles/png...
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/...
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...
developer.apple.com
June 11, 2025 at 6:08 AM
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/...
🥳 We added new attributes to HTML to enhance : webkit.org/blog/16900/p...
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.
webkit.org
May 7, 2025 at 1:19 PM
🥳 We added new attributes to HTML to enhance : webkit.org/blog/16900/p...
Reposted by Anne van Kesteren
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?
May 2, 2025 at 4:51 PM
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?
Reposted by Anne van Kesteren
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.
February 28, 2025 at 6:48 AM
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.
And yet another polyfill appears to have poisoned the standards well. This time for scoped custom element registries. People never learn. 🫠
February 27, 2025 at 10:15 AM
And yet another polyfill appears to have poisoned the standards well. This time for scoped custom element registries. People never learn. 🫠
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. 😅
January 23, 2025 at 7:36 AM
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. 😅
Reposted by Anne van Kesteren
📅 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
Check more details at: 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 ...
webengineshackfest.org
January 20, 2025 at 9:24 AM
📅 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
Check more details at: webengineshackfest.org
The aliens are coming and their goal is to invade and destroy Earth.
In the jungle I must wait until the dice roll five or eight
January 6, 2025 at 3:12 PM
The aliens are coming and their goal is to invade and destroy Earth.
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!
- 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!
December 19, 2024 at 3:49 PM
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!
- 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!
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.
December 18, 2024 at 7:42 AM
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.
Reposted by Anne van Kesteren
@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/whatwg/html/...
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...
github.com
December 14, 2024 at 12:37 AM
@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/whatwg/html/...
Reposted by Anne van Kesteren
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...
This article explains how it works, and shows up the possibilities in 7 demos.
#css #webdesign #webdevelopment #graphicdesign
webkit.org/blog/16214/b...
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?
webkit.org
November 20, 2024 at 4:03 PM
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...
This article explains how it works, and shows up the possibilities in 7 demos.
#css #webdesign #webdevelopment #graphicdesign
webkit.org/blog/16214/b...
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.
December 3, 2024 at 3:38 PM
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.
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.
Great question! Punycode is a representation of Unicode with the limited ASCII character subset used for Internet hostnames.
I turn this off in our browsers at work to avoid homoglyph attacks.
en.m.wikipedia.org/wiki/Punycode
I turn this off in our browsers at work to avoid homoglyph attacks.
en.m.wikipedia.org/wiki/Punycode
November 30, 2024 at 7:41 AM
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.
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!
November 29, 2024 at 6:19 PM
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!