[w3ctag/design-reviews] (Document Subtitle): Early review for adding a new value to the standard list of `name`s for a meta tag (Issue #819)

Hola TAG!

I'm requesting a TAG review of Document Subtitle.

Installed web apps cannot provide dynamic/controllable contextual information in their title bar. Contextual information can be the name of an open document, the section of an app or any other information that can be relevant to the running installed web app. Having this information in the title bar can be useful to identify the open window when selecting among open apps in surfaces like the Alt+Tab action on Windows (and similar actions on macOS and Linux to jump between open apps).

  - Explainer¹ (minimally containing user needs and example code): [Explainer](https://github.com/MicrosoftEdge/MSEdgeExplainers/blob/main/DocumentSubtitle/explainer.md)
  - Security and Privacy self-review²: [url](https://github.com/MicrosoftEdge/MSEdgeExplainers/blob/main/DocumentSubtitle/explainer.md#security)
  - Primary contacts (and their relationship to the specification):
      - [Diego Gonzalez](https://github.com/diekus), [Microsoft](https://microsoft.com) 
  - Organization/project driving the design: Microsoft
  - External status/issue trackers for this feature: [Chrome Status](https://chromestatus.com/feature/5168096826884096)

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): WHATWG (add the `subtitle` value to the list of `name`s)
  - The group where standardization of this work is intended to be done ("unknown" if not known): WHATWG
  - This work is being funded by: Microsoft
  - [Request for position Gecko](https://github.com/mozilla/standards-positions/issues/749)
  - [Request for position Webkit]()

You should also know that...

This is mostly to add a new value to names in the standard `name`s list for a meta tag. This does NOT involve creating a new HTML 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 [diekus]

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