View Transitions are a powerful Modern Web feature allow for smooth seamless animated transitions two between different states of a web page. They can make for a much more pleasant user experience, but as with any new web platform feature, browser support is not yet fully universal so you need to add some fallback logic to your code.

view-transitions-mock bridges that gap by polyfilling the full JavaScript API surface of Same-Document View Transitions, without the animation bits.

CSS Anchor Positioning is a powerful tool, but one of the things that you cannot do natively (yet) is animating the position-area property. This blog post introduces a technique to animate position-area changes using View Transitions.

Talk on CSS Anchor Positioning

Talk on CSS Anchor Positioning.

Vertical Tabs are available behind a flag in Chrome 145 (current beta)

From Chrome 145 onwards, 100vw will automatically subtract the size of the scrollbar from it if you have forced the html element to always show a scrollbar (using overflow{-y}: scroll) or have it reserve space for a scrollbar (using scrollbar-gutter: stable).

If you gloss over the Safari release notes – like the Safari 26.2 release notes – you see a lot of trailing “(12345678)”-mentions in the list of fixed bugs. These numbers are the internal bug IDs, as used within Apple’s internal bug tracker fka “Radar” (now Feedback Assistant).

These numbers are not linked to anything because Radar is an Apple-internal tool, so to external people these numbers are practically useless … or are they?

We have Scroll-Driven Animations. Now say hi to Scroll-Triggered Animations.

Once again, it has been an AMAZING year for CSS and UI. To celebrate this, we – the Chrome CSS/UI DevRel Team – created another edition of CSS Wrapped!

I recreated the Google Antigravity website with Modern CSS.

If you kinda understand Anchor Positioning, but it still surprises you from time to time, then most likely this is the missing piece of information: the Inset-Modified Containing Block (or IMCB for short).

Chrome 144 features a small change to overscroll-behavior: it now also works on non-scrollable scroll containers. While this change might seem trivial, it fixes an issue developers have been dealing with for ages: prevent a page from scrolling while a (modal) <dialog> is open.

A while ago I joined Dan Neciu – whom I met at Frontmania in 2023 – on his “Señors @ Scale” podcast. We talked about all things CSS.

Starting with Chrome 144, Anchor Positioning is going to be transform-aware. From then on, anchoring will resolve against the bounding box of the transformed ancho

By using two sequential View Transitions when intercepting links with the Navigation API – one in the precommitHandler and one in the regular handler – you can fake a Two-Phase View Transition today!

Chrome no longer forces width/height animations to run on the Main Thread, in case those values don’t actually change throughout an animation.

How the cascade, the animation-fill-mode, and implicit keyframes make things a bit more complicated then you’d initially think …

There’s a new type of CSS scroll-state query coming: scrolled

I built something that I needed into DevTools: debugging support for CSS @starting-style rules.

Which version of what browser supports which feature of View Transitions?

The CSS Podcast is back! Together with Una I’m co-hosting season 5 of the show, and we have some good episodes coming your way …

Check out the post I wrote for developer.chrome.com to learn what changed for View Transitions in 2025.

CSS Custom Functions (@function) + CSS if() + CSS color-scheme() = one sweet combo!

If you thought we were done with View Transitions, guess again! A feature Chrome is working on, is “Scoped View Transitions”, which allow you to scope a VT to a subtree of the DOM. We are actively looking for feedback on this one.

A new View Transitions-related feature we shipped in Chrome 140 is the ability to nest ::view-transition-group() pseudos. This is useful for retaining visual effects such as clipping, move elements as part of a group, etc.

At Middlesbrough Front End 2025 I gave a talk about some of the more exotic applications of View Transitions

At JSHeroes 2025 I gave a talk in Scroll-Driven Animations.

Slides + Recording of the talk “Supercharge Web UX with View Transitions” I gave at WebExpo.

For this year’s Google I/O, I recorded the session “Web animations today and tomorrow”. Check it out to learn how to guide, inform, and delight users by adding subtle and supportive animations to your web UIs.

Instead of duplicating an animation on the ::view-transition-group pseudo, you can also rely on CSS transitions on the original element … if you’ve set it up correctly.