[w3ctag/design-reviews] Spec review for Animation.progress (Issue #994)

こんにちは TAG-さん!

I'm requesting a TAG review of Animation.progress.

This feature adds a "progress" property to the JavaScript class [Animation](https://developer.mozilla.org/en-US/docs/Web/API/Animation). The goal of this property is provide authors a convenient and consistent representation of how far along an animation has advanced across its iterations and regardless of the nature of its [timeline](https://developer.mozilla.org/en-US/docs/Web/API/AnimationTimeline).

  - Explainer¹: https://github.com/DavMila/explainer-animation.pogress
  - Specification: https://drafts.csswg.org/web-animations-2/#the-progress-of-an-animation
  - WPT Tests:
    - https://wpt.fyi/results/web-animations/interfaces/Animation/progress.tentative.html?label=master&label=experimental&aligned&q=web-animations%2Finterfaces%2Fanimation%2Fprogress.tentative.html
    - https://wpt.fyi/results/web-animations/interfaces/Animation/scroll-timeline-progress.tentative.html?label=master&label=experimental&aligned&q=web-animations%2Finterfaces%2Fanimation%2Fscroll-timeline-progress.tentative.html
  - User research: N/A
  - Security and Privacy self-review²: This feature has no known privacy/security concerns.
  - GitHub repo: None
  - Primary contacts:
      - David Awogbemila (@DavMila), Google, Developer
      - Robert Flack (@flackr), Google, Developer
  - Organization/project driving the specification: [CSS Working Group](https://www.w3.org/groups/wg/css/)
  - Multi-stakeholder support³:
    - Chromium comments: Implemented as an experimental feature, [crbug.com/40914396](http://crbug.com/40914396)
    - Mozilla comments: https://github.com/mozilla/standards-positions/issues/1073
    - WebKit comments: https://github.com/WebKit/standards-positions/issues/398
  - Status/issue trackers for implementations⁴: [Chromestatus](https://chromestatus.com/feature/5083257285378048)

Further details:

  - [x] I have reviewed the TAG's [Web Platform Design Principles](https://www.w3.org/TR/design-principles/)
  - Relevant time constraints or deadlines: Chrome would like to ship whenever possible.
  - The group where the work on this specification is currently being done: [CSS Working Group](https://www.w3.org/groups/wg/css/)
  - Major unresolved issues with or opposition to this specification:
    - https://github.com/w3c/csswg-drafts/issues/8799#issuecomment-1971476352 (whether to clamp to [0,1])
  - This work is being funded by: Google



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