[w3ctag/design-reviews] WG New Spec: trigger-scope (Issue #1175)

DavMila created an issue (w3ctag/design-reviews#1175)

### Specification

https://drafts.csswg.org/css-animations-2/#trigger-scope

### Explainer

https://github.com/explainers-by-googlers/scroll-triggered-animations/blob/main/TRIGGER_SCOPE.md

### Links

- The WG's request for this TAG review: None  <!-- If the WG didn't express consensus to ask the TAG for a review, use the "Other Specification Review" template instead, at https://github.com/w3ctag/design-reviews/issues/new?template=015-other-spec-review.yaml. This is usually a deep link into minutes or an email thread. -->
- Previous early design review, if any: None
- An introduction to the feature, aimed at unfamiliar audiences: [explainer](https://github.com/explainers-by-googlers/scroll-triggered-animations/blob/main/TRIGGER_SCOPE.md) <!-- Can be the specification's or explainer's introduction, or another section. -->
- A description of the problems that end-users were facing before this proposal: [explainer](https://github.com/explainers-by-googlers/scroll-triggered-animations/blob/main/TRIGGER_SCOPE.md)  <!-- See https://w3ctag.github.io/explainer-explainer/#end-user-need -->
- Alternatives considered: [explainer](https://github.com/explainers-by-googlers/scroll-triggered-animations/blob/main/TRIGGER_SCOPE.md#alternatives-considered)  <!-- See https://w3ctag.github.io/explainer-explainer/#alternatives -->
- Examples of how to use the proposal to solve the end-users' problems: [explainer](https://github.com/explainers-by-googlers/scroll-triggered-animations/blob/main/TRIGGER_SCOPE.md#proposed-solution)  <!-- See https://w3ctag.github.io/explainer-explainer/#describe-proposal -->
- What do the end-users experience with this proposal:   <!-- See https://w3ctag.github.io/explainer-explainer/#describe-proposal -->
- User research you did to validate the problem and/or design, if any: None
- Web Platform Tests:  In Progress<!-- Or other tests if this is not a web platform feature. -->


### The specification

- [ ] Follows the [Web Platform Design Principles](https://www.w3.org/TR/design-principles/).
- [ ] Includes Security and Privacy Considerations sections based on answers to the [Security/Privacy Questionnaire](https://www.w3.org/TR/security-privacy-questionnaire/).

### Where and by whom is the work is being done?

- GitHub repo: None
- Primary contacts:
  -  @DavMila, Google, CSSWG participant
  -  @flackr, Google, CSSWG participant
  -  @tabatkins, Google, CSSWG participant, spec editor
- Organization/project driving the specification:
- This work is being funded by: Google
- Primary standards group developing this feature: CSSWG
- Incubation and standards groups that have discussed the design:
  - [CSSWG Issue #12581](https://github.com/w3c/csswg-drafts/issues/12581#issuecomment-3206707173)


### Feedback so far

- Active horizontal reviews: None https:// <!-- Link to an issue like https://github.com/webmachinelearning/webnn/issues/239, https://github.com/WebAssembly/spec/issues/1804, or https://github.com/w3c/did/issues/885, which itself links to the other horizontal reviews. If you haven't started the rest of the horizontal reviews, please consider doing so. -->
- Multi-stakeholder feedback:
  - Chromium comments: intend to implement: [crbug.com/466134208](https://issues.chromium.org/u/1/issues/466134208)
  - Mozilla comments: https://github.com/mozilla/standards-positions/issues/NNN <!-- And/or other places they've given feedback -->
  - WebKit comments: https://github.com/WebKit/standards-positions/issues/NNN <!-- And/or other places they've given feedback -->
  - {{...include feedback/review from developers, implementers, civil society, and others}}
- Major unresolved issues with or opposition to this specification:
- Status/issue trackers for implementations: [Chrome Status](https://chromestatus.com/feature/5152759609425920),<!-- Include links to  [Mozilla's](https://bugzilla.mozilla.org/), [WebKit's Bugzilla](https://bugs.webkit.org/), and trackers for other implementations if those are known to you. -->


### You should also know that...

_No response_

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Received on Thursday, 4 December 2025 23:02:19 UTC