[w3ctag/design-reviews] WG New Spec: Scroll-Triggered Animations (Issue #1167)

DavMila created an issue (w3ctag/design-reviews#1167)

### Specification

https://drafts.csswg.org/css-animations-2/#timeline-triggers

### Explainer

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

### Links

- The WG's request for this TAG review: None
- Previous early design review, if any: None (although https://github.com/w3ctag/design-reviews/issues/1111 is related)
- An introduction to the feature, aimed at unfamiliar audiences: https://github.com/explainers-by-googlers/scroll-triggered-animations/blob/main/README.md#proposed-solution  
- A description of the problems that end-users were facing before this proposal:  https://github.com/explainers-by-googlers/scroll-triggered-animations/blob/main/README.md#introduction 
- Alternatives considered: https://github.com/explainers-by-googlers/scroll-triggered-animations/blob/main/README.md#considered-alternatives  
- Examples of how to use the proposal to solve the end-users' problems: https://github.com/explainers-by-googlers/scroll-triggered-animations/blob/main/README.md#example 
- What do the end-users experience with this proposal: Seamless scroll-triggered animations  <!-- 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:  https://wpt.fyi/results/scroll-animations/animation-trigger?label=experimental&label=master&aligned 


### The specification

- [x] Follows the [Web Platform Design Principles](https://www.w3.org/TR/design-principles/).
- [x] 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: Google
- This work is being funded by: Google
- Primary standards group developing this feature: CSSWG
- Incubation and standards groups that have discussed the design:
  - CSSWG <!-- Include a link to minutes or issues in this group if possible. -->
    - [#12652](https://github.com/w3c/csswg-drafts/issues/12652#issuecomment-3329841437)
    - [#12611](https://github.com/w3c/csswg-drafts/issues/12611#issuecomment-3382276301)
    - [#12336](https://github.com/w3c/csswg-drafts/issues/12336#issuecomment-3206545734)
    - [#12119](https://github.com/w3c/csswg-drafts/issues/12119#issuecomment-2985057242) 

### Feedback so far

- Active horizontal reviews: We filed csswg-draft issue [#13010](https://github.com/w3c/csswg-drafts/issues/13010) to solicit feedback from the broader CSSWG on the overall spec text. <!-- 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: Chromium has an experimental prototype of this feature.
  - Mozilla comments: https://github.com/mozilla/standards-positions/issues/TBD <!-- And/or other places they've given feedback -->
  - WebKit comments: https://github.com/WebKit/standards-positions/issues/TBD <!-- And/or other places they've given feedback -->
- Major unresolved issues with or opposition to this specification: None
- Status/issue trackers for implementations: <!-- Include links to [Chrome Status](https://chromestatus.com/), [Mozilla's](https://bugzilla.mozilla.org/), [WebKit's Bugzilla](https://bugs.webkit.org/), and trackers for other implementations if those are known to you. -->
  - [Chromestatus](https://chromestatus.com/feature/5181996801982464)


### You should also know that...

There is also a [Web Animations](https://drafts.csswg.org/web-animations-2/) component to this proposal but only the [CSS Animations](https://drafts.csswg.org/css-animations-2/#animation-triggers) spec is up to date. We plan to update the Web Animations spec after the CSSAnimations spec has been reviewed in [#13010](https://github.com/w3c/csswg-drafts/issues/13010). We expect the web animations API to reflect the css animations API.

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