Jen Simmons
@jensimmons.bsky.social
Apple Evangelist on the Web Developer Experience team for Safari & Webkit. #PwME
Today the CSS Working Group resolved to rename the property that lets you adjust the tolerance of how content lays out in CSS Grid Lanes to `flow-tolerance`!
Just updated the article about it with the new name.
webkit.org/blog/17660/i...
Just updated the article about it with the new name.
webkit.org/blog/17660/i...
Introducing CSS Grid Lanes
It’s here, the future of masonry layouts on the web!
webkit.org
January 8, 2026 at 12:56 AM
Today the CSS Working Group resolved to rename the property that lets you adjust the tolerance of how content lays out in CSS Grid Lanes to `flow-tolerance`!
Just updated the article about it with the new name.
webkit.org/blog/17660/i...
Just updated the article about it with the new name.
webkit.org/blog/17660/i...
Reposted by Jen Simmons
Any Focus Area that still needs work is considered for Interop 2026, but it’s not included automatically.
Maybe some of these will be carried over? (Not individual failing tests, but whole areas.) Depends. It also might be more important to move on to other features to improve them.
Maybe some of these will be carried over? (Not individual failing tests, but whole areas.) Depends. It also might be more important to move on to other features to improve them.
January 5, 2026 at 8:32 PM
Any Focus Area that still needs work is considered for Interop 2026, but it’s not included automatically.
Maybe some of these will be carried over? (Not individual failing tests, but whole areas.) Depends. It also might be more important to move on to other features to improve them.
Maybe some of these will be carried over? (Not individual failing tests, but whole areas.) Depends. It also might be more important to move on to other features to improve them.
Happy new year! Ah, now we can checkout the results of Interop 2025 — and see the entire year on the dashboard.
wpt.fyi/interop-2025...
Safari might have started the year in last place, but we definitely ended in first.
(Interop Project tracks automated test pass rates for specific web API.)
wpt.fyi/interop-2025...
Safari might have started the year in last place, but we definitely ended in first.
(Interop Project tracks automated test pass rates for specific web API.)
January 5, 2026 at 8:15 PM
Happy new year! Ah, now we can checkout the results of Interop 2025 — and see the entire year on the dashboard.
wpt.fyi/interop-2025...
Safari might have started the year in last place, but we definitely ended in first.
(Interop Project tracks automated test pass rates for specific web API.)
wpt.fyi/interop-2025...
Safari might have started the year in last place, but we definitely ended in first.
(Interop Project tracks automated test pass rates for specific web API.)
Reposted by Jen Simmons
FINAAAAALLLYYYYYYY
Have you been wishing masonry layouts would just hurry up and arrive in CSS?? Well, happy holidays!
webkit.org/blog/17660/i...
webkit.org/blog/17660/i...
Introducing CSS Grid Lanes
It’s here!
webkit.org
December 30, 2025 at 8:34 PM
FINAAAAALLLYYYYYYY
Reposted by Jen Simmons
I enjoyed catching up on this post while I was on vacation.
Safari 26.2 is here with 65 features + 165 bug fixes — including field-sizing, Navigation API, Largest Contentful Paint, command & commandfor, CHIPS opt-in partitioned cookies, scrollend event, random(), WebGPU in WebXR, scrollbar-color, hidden=until-found and much more! webkit.org/blog/17640/w...
WebKit Features for Safari 26.2
Safari 26.2 is a big release.
webkit.org
January 5, 2026 at 3:39 PM
I enjoyed catching up on this post while I was on vacation.
Reposted by Jen Simmons
Have you been wishing masonry layouts would just hurry up and arrive in CSS?? Well, happy holidays!
webkit.org/blog/17660/i...
webkit.org/blog/17660/i...
Introducing CSS Grid Lanes
It’s here!
webkit.org
December 19, 2025 at 9:33 PM
Have you been wishing masonry layouts would just hurry up and arrive in CSS?? Well, happy holidays!
webkit.org/blog/17660/i...
webkit.org/blog/17660/i...
Reposted by Jen Simmons
Congrats to the Safari team. It's been years since Safari is the new IE meme was accurate.
December 20, 2025 at 1:28 AM
Congrats to the Safari team. It's been years since Safari is the new IE meme was accurate.
Check out all the revised demos of Grid Lanes in Safari Technology Preview 234!
webkit.org/demos/grid3/
webkit.org/demos/grid3/
December 20, 2025 at 1:31 AM
Check out all the revised demos of Grid Lanes in Safari Technology Preview 234!
webkit.org/demos/grid3/
webkit.org/demos/grid3/
More holiday cheer. For those of you asking about Safari’s “stable” Interop 2025 score…
December 20, 2025 at 1:19 AM
More holiday cheer. For those of you asking about Safari’s “stable” Interop 2025 score…
Reposted by Jen Simmons
The WebKit team is pushing out new features at lightning speed right now!
December 20, 2025 at 12:25 AM
The WebKit team is pushing out new features at lightning speed right now!
Did you see everything in Safari Technology Preview 234?
webkit.org/blog/17674/r...
It’s got a lot of new features including Grid Lanes, Threaded Scroll-driven Animations, seven new Web API, and more. Plus a TON of other improvements & fixes.
webkit.org/blog/17674/r...
It’s got a lot of new features including Grid Lanes, Threaded Scroll-driven Animations, seven new Web API, and more. Plus a TON of other improvements & fixes.
Release Notes for Safari Technology Preview 234
Safari Technology Preview Release 234 is now available for download for macOS Tahoe and macOS Sequoia.
webkit.org
December 20, 2025 at 12:22 AM
Did you see everything in Safari Technology Preview 234?
webkit.org/blog/17674/r...
It’s got a lot of new features including Grid Lanes, Threaded Scroll-driven Animations, seven new Web API, and more. Plus a TON of other improvements & fixes.
webkit.org/blog/17674/r...
It’s got a lot of new features including Grid Lanes, Threaded Scroll-driven Animations, seven new Web API, and more. Plus a TON of other improvements & fixes.
Have you been wishing masonry layouts would just hurry up and arrive in CSS?? Well, happy holidays!
webkit.org/blog/17660/i...
webkit.org/blog/17660/i...
Introducing CSS Grid Lanes
It’s here!
webkit.org
December 19, 2025 at 9:33 PM
Have you been wishing masonry layouts would just hurry up and arrive in CSS?? Well, happy holidays!
webkit.org/blog/17660/i...
webkit.org/blog/17660/i...
CSS `random()`, now in Safari 26.2.
Play around with it while waiting for other browsers to ship.
Play around with it while waiting for other browsers to ship.
Wasn't expecting how much fun random() is, it really opens up a ton of pure CSS creative possibilities.
Now you need custom functions, which combined with random() will enable all sorts of distributions, Perlin noise and more 😇
Now you need custom functions, which combined with random() will enable all sorts of distributions, Perlin noise and more 😇
December 16, 2025 at 5:36 PM
CSS `random()`, now in Safari 26.2.
Play around with it while waiting for other browsers to ship.
Play around with it while waiting for other browsers to ship.
Reposted by Jen Simmons
Do you have a favourite CSS one-liner?
December 16, 2025 at 1:37 PM
Do you have a favourite CSS one-liner?
Wondering what’s coming next in Safari 26.3? Well, check out the beta release notes: developer.apple.com/documentatio...
Safari 26.3 Beta Release Notes | Apple Developer Documentation
Released December 15, 2025 — 26.3 (20623.2.2)
developer.apple.com
December 16, 2025 at 5:32 PM
Wondering what’s coming next in Safari 26.3? Well, check out the beta release notes: developer.apple.com/documentatio...
Which feature in Safari 26.2 is your favorite??
I always try to imagine the answer while writing… will they be more excited about command/commandfor or field-sizing? Are the HTML improvements the headline? Or CSS/SVG/JS…?
Then I’m curious, what do you really think?
webkit.org/blog/17640/w...
I always try to imagine the answer while writing… will they be more excited about command/commandfor or field-sizing? Are the HTML improvements the headline? Or CSS/SVG/JS…?
Then I’m curious, what do you really think?
webkit.org/blog/17640/w...
WebKit Features for Safari 26.2
Safari 26.2 is a big release.
webkit.org
December 15, 2025 at 8:38 PM
Which feature in Safari 26.2 is your favorite??
I always try to imagine the answer while writing… will they be more excited about command/commandfor or field-sizing? Are the HTML improvements the headline? Or CSS/SVG/JS…?
Then I’m curious, what do you really think?
webkit.org/blog/17640/w...
I always try to imagine the answer while writing… will they be more excited about command/commandfor or field-sizing? Are the HTML improvements the headline? Or CSS/SVG/JS…?
Then I’m curious, what do you really think?
webkit.org/blog/17640/w...
Reposted by Jen Simmons
Safari 26.2 is here with 65 features + 165 bug fixes — including field-sizing, Navigation API, Largest Contentful Paint, command & commandfor, CHIPS opt-in partitioned cookies, scrollend event, random(), WebGPU in WebXR, scrollbar-color, hidden=until-found and much more! webkit.org/blog/17640/w...
WebKit Features for Safari 26.2
Safari 26.2 is a big release.
webkit.org
December 12, 2025 at 6:44 PM
Safari 26.2 is here with 65 features + 165 bug fixes — including field-sizing, Navigation API, Largest Contentful Paint, command & commandfor, CHIPS opt-in partitioned cookies, scrollend event, random(), WebGPU in WebXR, scrollbar-color, hidden=until-found and much more! webkit.org/blog/17640/w...
Reposted by Jen Simmons
December 14, 2025 at 5:31 PM
Safari 26.2 is here with 65 features + 165 bug fixes — including field-sizing, Navigation API, Largest Contentful Paint, command & commandfor, CHIPS opt-in partitioned cookies, scrollend event, random(), WebGPU in WebXR, scrollbar-color, hidden=until-found and much more! webkit.org/blog/17640/w...
WebKit Features for Safari 26.2
Safari 26.2 is a big release.
webkit.org
December 12, 2025 at 6:44 PM
Safari 26.2 is here with 65 features + 165 bug fixes — including field-sizing, Navigation API, Largest Contentful Paint, command & commandfor, CHIPS opt-in partitioned cookies, scrollend event, random(), WebGPU in WebXR, scrollbar-color, hidden=until-found and much more! webkit.org/blog/17640/w...
Reposted by Jen Simmons
“The problem with Long COVID is that most of society would rather not see it.”
@philipandrewhoover.bsky.social writes that he often feels that he’s living a double life. How can this sick side of him be so central, so enormous, yet so unseen by those who know and love him? bit.ly/4pf80g7
@philipandrewhoover.bsky.social writes that he often feels that he’s living a double life. How can this sick side of him be so central, so enormous, yet so unseen by those who know and love him? bit.ly/4pf80g7
December 1, 2025 at 6:04 PM
“The problem with Long COVID is that most of society would rather not see it.”
@philipandrewhoover.bsky.social writes that he often feels that he’s living a double life. How can this sick side of him be so central, so enormous, yet so unseen by those who know and love him? bit.ly/4pf80g7
@philipandrewhoover.bsky.social writes that he often feels that he’s living a double life. How can this sick side of him be so central, so enormous, yet so unseen by those who know and love him? bit.ly/4pf80g7
Reposted by Jen Simmons
Beautiful @thesicktimes.org essay on how to be a friend to your friends who are affected by Long Covid—and why you should.
Def worth a few minutes of your time.
Def worth a few minutes of your time.
The Sick Times: 'You know someone with Long COVID. They need you to ask about it genuinely.'
Written by Philip Hoover
'If community-building is a bulwark against autocracy, then asking after one another might be a good place to start.'
thesicktimes.org/2025/11/28/y...
Written by Philip Hoover
'If community-building is a bulwark against autocracy, then asking after one another might be a good place to start.'
thesicktimes.org/2025/11/28/y...
You know someone with Long COVID. They need you to ask about it genuinely. - The Sick Times
If community-building is a bulwark against autocracy, then asking after one another might be a good place to start.
thesicktimes.org
November 28, 2025 at 9:33 PM
Beautiful @thesicktimes.org essay on how to be a friend to your friends who are affected by Long Covid—and why you should.
Def worth a few minutes of your time.
Def worth a few minutes of your time.
Reposted by Jen Simmons
I really can't wait to show you my CSS layout course. I'm learning a few things along the way. Currently, I'm working on some grid explanation and it's so much fun to have some aha-moments.
Teaching is learning! ❤️
You can sign up for details: layoutmaestro.ishadeed.com
Teaching is learning! ❤️
You can sign up for details: layoutmaestro.ishadeed.com
November 21, 2025 at 12:12 PM
I really can't wait to show you my CSS layout course. I'm learning a few things along the way. Currently, I'm working on some grid explanation and it's so much fun to have some aha-moments.
Teaching is learning! ❤️
You can sign up for details: layoutmaestro.ishadeed.com
Teaching is learning! ❤️
You can sign up for details: layoutmaestro.ishadeed.com
Reposted by Jen Simmons
ok I've decided what my interop 2026 vote is (#interop2026)?
`margin-trim`
My fingers reach for it all the time only to be like, oh yeah, Safari-only.
Imagine a `.card` with padding, it just *begs* for `margin-trim: block;`
`margin-trim`
My fingers reach for it all the time only to be like, oh yeah, Safari-only.
Imagine a `.card` with padding, it just *begs* for `margin-trim: block;`
November 23, 2025 at 1:25 AM
ok I've decided what my interop 2026 vote is (#interop2026)?
`margin-trim`
My fingers reach for it all the time only to be like, oh yeah, Safari-only.
Imagine a `.card` with padding, it just *begs* for `margin-trim: block;`
`margin-trim`
My fingers reach for it all the time only to be like, oh yeah, Safari-only.
Imagine a `.card` with padding, it just *begs* for `margin-trim: block;`
The overall interoperability score for Interop 2025 has reached 92% test pass rate!! Looking good!
November 14, 2025 at 5:27 PM
The overall interoperability score for Interop 2025 has reached 92% test pass rate!! Looking good!
Reposted by Jen Simmons
So happy that "Added WebGPU support for WebXR" (developer.apple.com/documentatio...) made it! Thank you!
Safari 26.2 Beta Release Notes | Apple Developer Documentation
Released November 4, 2025 — 26.2 beta (20623.1.12)
developer.apple.com
November 6, 2025 at 3:58 AM
So happy that "Added WebGPU support for WebXR" (developer.apple.com/documentatio...) made it! Thank you!