[w3ctag/design-reviews] CSS View Transitions - Nested View Transition Groups (Issue #1061)

vmpstr created an issue (w3ctag/design-reviews#1061)

こんにちは TAG-さん!

I'm requesting a TAG review of CSS View Transition - Nested View Transition Groups.

[View transitions](https://www.w3.org/TR/css-view-transitions-1/) work by generating a pseudo-element tree representing groups of the captured old state & the live new state of a transition. In its current form, the generated tree is "flat" - the original hierarchy in the DOM is lost, and all the captured groups are siblings under a single ::view-transition pseudo-element.

Instead of a flat tree, the author can nest ::view-transition-group pseudo-elements within each other. This is done with a new property, [view-transition-group](https://www.w3.org/TR/css-view-transitions-2/#view-transition-group-prop), which when applied on an element with a view-transition-name, defines whether the generated ::view-transition-group gets nested in one of its containers, or it would nest its own participating descendants.

  - Explainer¹: https://github.com/WICG/view-transitions/blob/main/nested-explainer.md
  - Specification: https://www.w3.org/TR/css-view-transitions-2/#view-transition-group-prop
  - WPT Tests: https://wpt.fyi/results/css/css-view-transitions/nested?label=master&label=experimental&aligned
  - User research: N/A
  - Security and Privacy self-review²: N/A
  - GitHub repo: https://github.com/w3c/csswg-drafts/
  - Primary contacts:
      - @vmpstr (Google, Author)
      - @noamr (Google, Author)
  - Organization/project driving the specification: Google
  - Multi-stakeholder support³:
    - Chromium comments: N/A
    - Mozilla comments: (pending)
    - WebKit comments: (pending)
  - Status/issue trackers for implementations⁴: https://chromestatus.com/feature/5162799714795520

Further details:

  - [x] I have reviewed the TAG's [Web Platform Design Principles](https://www.w3.org/TR/design-principles/)
  - Previous early design review, if any: N/A
  - Relevant time constraints or deadlines: N/A
  - The group where the work on this specification is currently being done: CSSWG
  - The group where standardization of this work is intended to be done (if different from the current group):
  - Major unresolved issues with or opposition to this specification: N/A
  - This work is being funded by: Google

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