[w3ctag/design-reviews] Paint/presentation timestamps in performance APIs (Issue #1013)

こんにちは TAG-さん!

I'm requesting an early TAG design review of Paint/presentation timestamps in performance APIs.

Aligning different paint-related timestamps in all the relevant performance APIs, by having one "interoperable" timestamp
and one coarsened platform-specific "VSync" (or "pixels on screen") timestamp.

  - Explainer¹: https://github.com/w3c/paint-timing/blob/main/presentation-timestamps.md
  - User research:
  - Security and Privacy self-review²: https://github.com/w3c/paint-timing/pull/107
  - GitHub repo: https://github.com/w3c/paint-timing/
  - Primary contacts:
      - @noamr, Google Inc, editor
      - @mmocny, Google Inc, editor
  - Organization/project driving the design: Google
  - Multi-stakeholder feedback³:
    - Chromium comments: Supportive (driving)
    - Mozilla comments: https://github.com/mozilla/standards-positions/issues/NNN
    - WebKit comments: https://github.com/WebKit/standards-positions/issues/NNN
    - {{...include feedback/review from developers, implementers, civil society, and others}}

Further details:

  - [x] I have reviewed the TAG's [Web Platform Design Principles](https://www.w3.org/TR/design-principles/)
  - The group where the incubation/design work on this is being done (or is intended to be done in the future):
  - The group where standardization of this work is intended to be done ("unknown" if not known):
  - Existing major pieces of multi-implementer review or discussion of this design:
  - Major unresolved issues with or opposition to this design:
  - This work is being funded by:

You should also know that...

This has been discussed in the WebPerfWG in detail over the last 2 years.

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