[w3ctag/design-reviews] Early design review: Shared Element Transitions (#631)

Ya ya yawm TAG!

I'm requesting a TAG review of the Shared/Root Element Transitions API.

Summary

Shared Element Transitions is a proposal for a new script API that allows a simple set of transitions in both Single-Page Applications (SPAs) and Multi-Page Applications (MPAs).

The inspiration for this feature are transitions similar to the ones listed in the [Material Design Principles](https://material.io/design/motion/the-motion-system.html).

The intent is to support transitions similar to [Android Activity Transitions](https://developer.android.com/training/transitions/start-activity).

In the SPA case, this entails capturing pre-transition visuals, updating the page, and animating to the post-transition state. The API for MPAs is still being designed (issue [here](https://github.com/WICG/shared-element-transitions/issues/2)).

  - Explainer (minimally containing user needs and example code): https://github.com/WICG/shared-element-transitions/blob/main/README.md

  - Security and Privacy self-review: https://github.com/WICG/shared-element-transitions/blob/main/security-privacy-questionnaire.md

  - GitHub repo (if you prefer feedback filed there): https://github.com/WICG/shared-element-transitions

  - Primary contacts (and their relationship to the specification):
      - Vladimir Levin (@vmpstr), Google (editor)
      - Ian Vollick (@ianvollick), Google
      - Chris Harrelson (@chrishtr), Google
  - Organization/project driving the design: Google
  - External status/issue trackers for this feature (publicly visible, e.g. Chrome Status): https://chromestatus.com/features#shared%20element%20transitions


Further details:

  - ✅ I have reviewed the TAG's [Web Platform Design Principles](https://w3ctag.github.io/design-principles/)
  - The group where the incubation/design work on this is being done (or is intended to be done in the future): WICG
  - The group where standardization of this work is intended to be done ("unknown" if not known): CSSWG
  - Existing major pieces of multi-stakeholder review or discussion of this design: n/a
  - Major unresolved issues with or opposition to this design: desire for more control over customization (eg, [1](https://github.com/WICG/shared-element-transitions/issues/28), [2](https://github.com/WICG/shared-element-transitions/issues/9))
  - This work is being funded by: Google

We'd prefer the TAG provide feedback as (please delete all but the desired option):

  ☂️ open a single issue in our GitHub repo **for the entire review**

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