[w3ctag/design-reviews] Shared Element Transitions API (Issue #748)

Wotcher TAG!

I'm requesting a TAG review of Shared Element Transitions.

Shared Element Transitions is a proposal for a new web API that allows a simple set of transition animations 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).

  - Explainer¹ (minimally containing user needs and example code): [explainer](https://github.com/WICG/shared-element-transitions/blob/main/explainer.md)
  - Specification URL: [Draft spec](https://tabatkins.github.io/specs/css-shared-element-transitions/)
  - Tests: [WPTs](https://source.chromium.org/chromium/chromium/src/+/main:third_party/blink/web_tests/wpt_internal/). These will be merged upstream when shipping the feature.
  - User research: N/A
  - Security and Privacy self-review²: [questionnaire](https://github.com/WICG/shared-element-transitions/blob/main/security-privacy-questionnaire.md)
  - GitHub repo (if you prefer feedback filed there): [WICG repo](https://github.com/WICG/shared-element-transitions)
  - Primary contacts (and their relationship to the specification):
      - Khushal Sagar (@khushalsagar), Google
      - Vladimir Levin (@vmpstr), Google
      - Tab Atkins (@tabatkinds), Google
  - Organization(s)/project(s) driving the specification: Google
  - Key pieces of existing multi-stakeholder review or discussion of this specification:
  - External status/issue trackers for this specification (publicly visible, e.g. Chrome Status): [Chrome Status](https://chromestatus.com/feature/5193009714954240)

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: 
  - The group where the work on this specification is currently being done: WICG
  - The group where standardization of this work is intended to be done (if current group is a community group or other incubation venue): CSSWG
  - Major unresolved issues with or opposition to this specification: N/A
  - 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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