[w3ctag/design-reviews] Borderless mode (Issue #852)

こんにちは TAG-さん!

I'm requesting a TAG review of borderless mode.

Currently all the possible app display and display_override](https://developer.mozilla.org/en-US/docs/Web/Manifest/display_override#values) modes rely on apps having at least some format of a title bar - something between the full Chrome title bar and currently most minimized [window-controls-overlay](https://developer.mozilla.org/en-US/docs/Web/API/Window_Controls_Overlay_API) (WCO). Despite WCO having some same qualities as what we are trying to achieve, it is still not offering enough flexibility for some use-cases. To enable such use-cases, this explainer will explain how the title bar will be completely removed and so-called borderless mode enabled. This way the title bar area is replaced with web content and so giving the developers full control on how the title bar would look like.

  - Explainer¹ (minimally containing user needs and example code): https://github.com/WICG/manifest-incubations/blob/gh-pages/borderless-explainer.md
  - User research: [url to public summary/results of research]
  - Security and Privacy self-review²: [url]
  - Primary contacts (and their relationship to the specification):
      - Sonja Laurila (sonkkeli@), Google
      - Dan Murphy (dmurph@), Google
  - Organization/project driving the design: Google
  - External status/issue trackers for this feature (publicly visible, e.g. Chrome Status): https://chromestatus.com/feature/5551475195904000

Further details:

  - [ ] 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): Google
  - The group where standardization of this work is intended to be done ("unknown" if not known): WICG/manifest-incubations
  - Existing major pieces of multi-stakeholder review or discussion of this design:
  - Major unresolved issues with or opposition to this design:
  - This work is being funded by:

You should also know that...

This feature will only be available for [Isolated Web Apps](https://github.com/w3ctag/design-reviews/issues/842).

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 sonkkeli, dmurph

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