I omitted the Estimated milestones. It is testable in M144.


On Mon, Nov 17, 2025 at 11:16 AM Chromestatus <
[email protected]> wrote:

> *Contact emails*
> [email protected]
>
> *Explainer*
> https://github.com/explainers-by-googlers/scroll-triggered-animations
>
> *Specification*
> https://drafts.csswg.org/css-animations-2/#animation-triggers
>
> *Design docs*
>
>
> https://github.com/explainers-by-googlers/scroll-triggered-animations/blob/main/README.md
>
> *Summary*
> This feature adds scroll-position-based control of animations, e.g.
> playing, pausing, and resetting. A common pattern on pages across the web
> is to kick off an animation when a scroll position is reached. Developers
> often do this by using JavaScript to manually detect that an element is
> within its scroll container's viewport and to kick off a corresponding
> animation (e.g. perhaps sliding that element into view). Many of such use
> cases are based on information that can be provided declaratively. This
> feature gives authors the ability to create such interactions declaratively
> via CSS, allowing the user agent to offload the handling of this
> interaction to a worker thread. The API also includes JavaScript interfaces
> that allow the feature to be extended to web animations in addition to CSS
> animations.
>
> *Blink component*
> Blink>CSS
> <https://issues.chromium.org/issues?q=customfield1222907:%22Blink%3ECSS%22>
>
> *Web Feature ID*
> Missing feature
>
> *Risks*
>
>
> *Interoperability and Compatibility*
> *No information provided*
>
> *Gecko*: No signal (
> https://github.com/mozilla/standards-positions/issues/1315)
>
> *WebKit*: No signal (
> https://github.com/WebKit/standards-positions/issues/576)
>
> *Web developers*: No signals
>
> *Other signals*:
>
> *WebView application risks*
>
> Does this intent deprecate or change behavior of existing APIs, such that
> it has potentially high risk for Android WebView-based applications?
> *No information provided*
>
>
> *Debuggability*
> *No information provided*
>
> *Will this feature be supported on all six Blink platforms (Windows, Mac,
> Linux, ChromeOS, Android, and Android WebView)?*
> Yes
>
> *Is this feature fully tested by web-platform-tests
> <https://chromium.googlesource.com/chromium/src/+/main/docs/testing/web_platform_tests.md>?*
> Yes
>
> https://wpt.fyi/results/?label=master&label=experimental&aligned&q=scroll-animations%2Fanimation-trigger
>
> *DevTrial instructions*
>
> https://github.com/explainers-by-googlers/scroll-triggered-animations/blob/main/DEV_TRIALS.md
>
> *Flag name on about://flags*
> *No information provided*
>
> *Finch feature name*
> *No information provided*
>
> *Non-finch justification*
> *No information provided*
>
> *Requires code in //chrome?*
> False
>
> *Tracking bug*
> https://crbug.com/390314945
>
> *Estimated milestones*
>
> No milestones specified
>
>
> *Link to entry on the Chrome Platform Status*
> https://chromestatus.com/feature/5181996801982464
>
> *Links to previous Intent discussions*
> Intent to Prototype:
> https://groups.google.com/a/chromium.org/d/msgid/blink-dev/CAA6pwF6yEmATfHMv4RCp%2B6F_ufem%2Bt3%3D4maF15ySCKGXfCxb3w%40mail.gmail.com
>
>
> This intent message was generated by Chrome Platform Status
> <https://chromestatus.com>.
>

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