Hey David,
This seems fairly straightforward to me, but I imagine there's probably
some developer signals here, right? Somebody who has said why they want
this?

Thanks,
   Rick

On Tue, Dec 9, 2025 at 4:40 PM David Awogbemila <[email protected]>
wrote:

> *Contact emails*
> [email protected]
>
> *Explainer*
>
> https://github.com/explainers-by-googlers/scroll-triggered-animations/blob/main/TRIGGER_SCOPE.md
>
> *Specification*
> https://drafts.csswg.org/css-animations-2/#trigger-scope
>
> *Summary*
> trigger-scope gives authors the ability to limit the names of animation
> triggers declared by trigger-instantiating properties.
> Trigger-Instantiating properties, such as timeline-trigger, declare names
> which can be referenced by the animation-trigger property in order to
> attach animations to triggers. However, these names are global by default
> (similar to anchor-name) and it is often useful for author to limit the
> visibility of the names so as to isolate animation-to-trigger interactions.
>
> *Blink component*
> Blink>Animation
> <https://issues.chromium.org/issues?q=customfield1222907:%22Blink%3EAnimation%22>
>
> *Web Feature ID*
> Missing feature
>
> *Motivation*
> Similar to anchor-scope[1], trigger-instantiating properties need a
> mechanism for limiting the visibility of the names declared by the
> trigger-instantiating property. [1]
> https://drafts.csswg.org/css-anchor-position-1/#anchor-scope
>
> *Initial public proposal*
> *No information provided*
>
> *TAG review*
> https://github.com/w3ctag/design-reviews/issues/1175
>
> *TAG review status*
> Pending
>
> *Risks*
>
>
> *Interoperability and Compatibility*
> *No information provided*
>
> *Gecko*: No signal (
> https://github.com/mozilla/standards-positions/issues/1327)
>
> *WebKit*: No signal (
> https://github.com/WebKit/standards-positions/issues/589)
>
> *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=trigger-scope
>  (As
> of this writing, only the parsing tests are present on the dashboard but
> functional tests[1] are quickly following) [1]
> https://github.com/web-platform-tests/wpt/pull/56601
>
> *Flag name on about://flags*
> *No information provided*
>
> *Finch feature name*
> *No information provided*
>
> *Non-finch justification*
> *No information provided*
>
> *Rollout plan*
> Will ship enabled for all users
>
> *Requires code in //chrome?*
> False
>
> *Tracking bug*
> https://crbug.com/466134208
>
> *Estimated milestones*
> Shipping on desktop 145
> Shipping on Android 145
> Shipping on WebView 145
>
> *Anticipated spec changes*
>
> Open questions about a feature may be a source of future web compat or
> interop issues. Please list open issues (e.g. links to known github issues
> in the project for the feature specification) whose resolution may
> introduce web compat/interop risk (e.g., changing to naming or structure of
> the API in a non-backward-compatible way).
> *No information provided*
>
> *Link to entry on the Chrome Platform Status*
> https://chromestatus.com/feature/5152759609425920?gate=5794840308744192
>
> This intent message was generated by Chrome Platform Status
> <https://chromestatus.com/>.
>
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> .
>

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