[w3ctag/design-reviews] TAG review for web app `scope_extensions` (Issue #875)

Hola TAG!

I'm requesting a TAG review of scope-extensions.

This document describes a new scope_extensions manifest member that enables web apps to extend their [scope](https://www.w3.org/TR/appmanifest/#understanding-scope) to other origins. This allows sites that control multiple subdomains and top level domains to behave as one contiguous web app and also enables web apps to capture user navigations to sites they are affiliated with.


  - Explainer¹ (minimally containing user needs and example code): [Scope Extensions explainer](https://github.com/WICG/manifest-incubations/blob/gh-pages/scope_extensions-explainer.md)
  - Specification URL: N/A
  - Tests: N/A
  - User research: N/A
  - Security and Privacy self-review²: [url](https://github.com/WICG/manifest-incubations/blob/luhua/scope_extensions-security-privacy-questionnaire.md)
  - GitHub repo (if you prefer feedback filed there): [url](https://github.com/WICG/manifest-incubations)
  - Primary contacts (and their relationship to the specification):
      - [Lu Huang](https://github.com/LuHuangMSFT), Microsoft
      -  [Diego Gonzalez](https://github.com/diekus), Microsoft
      - Daniel Murphy, Google
  - Organization(s)/project(s) driving the specification: Microsoft (Edge)
  - Key pieces of existing multi-stakeholder review or discussion of this specification: N/A
  - External status/issue trackers for this specification (publicly visible, e.g. Chrome Status): [ChromeStatus entry](https://chromestatus.com/feature/5746537956114432)

Further details:

  - [ X ] I have reviewed the TAG's [Web Platform Design Principles](https://www.w3.org/TR/design-principles/)
  - Relevant time constraints or deadlines: [please provide]
  - The group where the work on this specification is currently being done: WICG
  - The group where standardization of this work is intended to be done (if current group is a community group or other incubation venue): WICG
  - Major unresolved issues with or opposition to this specification: N/A
  - This work is being funded by: Microsoft

You should also know that...

[please tell us anything you think is relevant to this review]

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 [luhuangmsft and diekus]


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