[w3ctag/design-reviews] HTMLPopupElement - <popup> (#599)

HIQaH! QaH! TAG!

I'm requesting a TAG review of the `<popup>` element.

A new HTML element, `<popup>`, which can be used to build transient user interface (UI) elements that are displayed on top of all other web app UI. These include user-interactive elements like action menus, form element suggestions, content pickers, and teaching UI. This new element is similar to `<dialog>`, but has several important differences, including light-dismiss behavior, anchoring, and the lack of a "modal" mode.

  - Explainer: https://github.com/MicrosoftEdge/MSEdgeExplainers/blob/main/Popup/explainer.md

  - Security and Privacy self-review: All questions have a "no risk" answer, with the potential (very small) exception of this one:

   Does this specification allow an origin some measure of control over a user agent’s native UI?
   --> The `<popup>` element allows author-provided popup dialogs to be shown to the user. These popups are fully-contained within the owning frame, and do not overlap either parent frames or the browser UI. So there shouldn't be any issue here. But I'm bringing it up for completeness.

  - GitHub repo (if you prefer feedback filed there): I'd prefer feedback here on this issue.
  - Primary contacts (and their relationship to the specification):
      - Mason Freed (@mfreed7), Google
      - Melanie Richards (@melanierichards, Microsoft
  - Organization/project driving the design: Google DOM Team, Microsoft DOM/Editing Team 
  - External status/issue trackers for this feature: https://chromestatus.com/guide/edit/5463833265045504


Further details:

  - [X] I have reviewed the TAG's [API 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](https://wicg.io/)
  - The group where standardization of this work is intended to be done ("unknown" if not known): [WHATWG](https://whatwg.org/)
  - Existing major pieces of multi-stakeholder review or discussion of this design: {coming soon}
  - Major unresolved issues with or opposition to this design: "Major" is a strong word, but there is a [section of the explainer](https://github.com/MicrosoftEdge/MSEdgeExplainers/blob/main/Popup/explainer.md#open-questions) that discusses open issues and questions. Thoughts on those issues would definitely be appreciated from TAG.
  - This work is being funded by: Google and Microsoft

You should also know that...

I like the TAG.

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

  💬 leave review feedback as a **comment in this issue** and @-notify @mfreed7 and @melanierichards


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