[w3ctag/design-reviews] Early design review: Document Picture-in-Picture (Issue #798)

Wotcher TAG!

I'm requesting a TAG review of Document Picture-in-Picture.

There currently exists a Web API for putting an HTMLVideoElement into a Picture-in-Picture window (HTMLVideoElement.requestPictureInPicture()). This limits a website's ability to provide a custom picture-in-picture experience (PiP). We want to expand upon that functionality by giving websites the ability to open a picture-in-picture (i.e., always-on-top) window with a blank document that can be populated with arbitrary HTMLElements instead of only a single HTMLVideoElement.

  - Explainer¹: https://github.com/WICG/document-picture-in-picture

  - Security and Privacy self-review²: https://github.com/WICG/document-picture-in-picture/blob/main/security-privacy-questionnaire.md

  - GitHub repo (if you prefer feedback filed there): https://github.com/WICG/document-picture-in-picture

  - Primary contacts (and their relationship to the specification):
      - Tommy Steimel (steimelchrome), Google
      - Frank Liberato (liberato-at-chromium), Google
  - Organization/project driving the design: Google Chrome
  - External status/issue trackers for this feature (publicly visible, e.g. Chrome Status): https://chromestatus.com/feature/5755179560337408


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): WICG
  - The group where standardization of this work is intended to be done ("unknown" if not known): unknown
  - Major unresolved issues with or opposition to this design:
    - See [github issues list](https://github.com/WICG/document-picture-in-picture/issues) for known problems. One notable issue is that we're still trying to figure out how to best design and specify how CSS copying works for this feature
  - This work is being funded by: Google

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

  🐛 open issues in our GitHub repo for **each point of feedback**


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