[w3ctag/design-reviews] Early design review: Future browsing context group dependency hint (Issue #979)

こんにちは TAG-さん!

I'm requesting a TAG review of a future browsing context group dependency hint.

Some browsers perform a browsing context group (BCG) swap on navigations for performance reasons. In certain scenarios, this can cause web-facing breakage of named window reuse. This proposal introduces an opt-out mechanism that web content can use to indicate to the browser that it relies on a browsing context group change not happening. The proposed mechanism is to use the ["opener"](https://html.spec.whatwg.org/multipage/links.html#link-type-opener) rel type. An author would annotate anchor elements for which a BCG swap on navigation would cause breakage.

  - Explainer¹ (minimally containing user needs and example code): https://github.com/explainers-by-googlers/future-browsing-context-group-dependency-hint
  - User research: None
  - Security and Privacy self-review²: https://github.com/explainers-by-googlers/future-browsing-context-group-dependency-hint/blob/main/security-privacy-questionnaire.md
  - GitHub repo: https://github.com/explainers-by-googlers/future-browsing-context-group-dependency-hint
  - Primary contacts (and their relationship to the specification):
      - Kevin McNee (@kjmcnee), Google, Chromium implementer
  - Organization/project driving the design: Google Chrome
  - External status/issue trackers for this feature (publicly visible, e.g. Chrome Status): https://chromestatus.com/feature/5182336170983424

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): Discussion in the explainer repo.
  - The group where standardization of this work is intended to be done ("unknown" if not known): This will be a patch for the html spec.
  - Existing major pieces of multi-implementer review or discussion of this design: None
  - Major unresolved issues with or opposition to this design: None known at this time.
  - This work is being funded by: Google

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