[w3ctag/design-reviews] Conditional Focus (Wehn Display-Capture Starts) (#679)

Braw mornin' TAG!

I'm requesting a TAG review of [Conditional Focus](https://eladalon1983.github.io/conditional-focus/).

When an application starts capturing a display-surface, the user agent faces a decision - should the captured display-surface be brought to the forefront, or should the capturing application retain focus.

The user agent is mostly agnostic of the nature of the capturing and captured applications, and is therefore ill-positioned to make an informed decision.

In contrast, the capturing application is familiar with its own properties, and is therefore better suited to make this decision. Moreover, by reading [displaySurface](https://www.w3.org/TR/screen-capture/#dom-mediatrackconstraintset-displaysurface) and/or using [Capture Handle](https://wicg.github.io/capture-handle/), the capturing application can learn about the captured display-surface, driving an even more informed decision.

  - Explainer: https://github.com/eladalon1983/conditional-focus/blob/main/README.md

  - Specification URL: https://eladalon1983.github.io/conditional-focus/

  - Tests: N/A
  - Security and Privacy self-review: TBD
  - Primary contacts:
      - Elad Alon (@eladalon1983), Google
  - Organization(s)/project(s) driving the specification: Google
  - Key pieces of existing multi-stakeholder review or discussion of this specification:
      - https://github.com/w3c/mediacapture-screen-share/issues/190

      - https://github.com/WICG/proposals/issues/37

  - External status/issue trackers for this specification (publicly visible, e.g. Chrome Status): https://www.chromestatus.com/feature/5646614535340032


Further details:

  - [X] I have reviewed the TAG's [Web Platform Design Principles](https://w3ctag.github.io/design-principles/)
  - Relevant time constraints or deadlines: N/A
  - The group where the work on this specification is currently being done: WebRTC WG
  - The group where standardization of this work is intended to be done (if current group is a community group or other incubation venue): WebRTC WG and/or WICG
  - Major unresolved issues with or opposition to this specification: N/A
  - This work is being funded by: Google

You should also know that...

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 @eladalon1983

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