[w3ctag/design-reviews] Viewport Segments Property (Issue #689)

Braw mornin' TAG!

I'm requesting a TAG review of the Viewport Segments Property after taking into account feedback (e.g. webscreens/window-segments#12) around integrating our original Window Segments API proposal (initial TAG review here: #492) with the Visual Viewport API. 

Web developers targeting foldable devices want to be able to effectively lay out the content in a window that spans multiple displays. However, the web platform does not yet provide the necessary primitives for building layouts that are optimized for foldable experiences. The Viewport Segments Property will provide a list of logical segments of the viewport that web developers can use to target with different views, as appropriate based on size and configuration of those segments.

- Explainer¹ (minimally containing user needs and example code): https://github.com/WICG/visual-viewport/blob/gh-pages/segments-explainer/SEGMENTS-EXPLAINER.md

- Security and Privacy self-review²: https://github.com/webscreens/window-segments/blob/master/TAG-Security-and-Privacy-Questionnaire.md

- GitHub repo (if you prefer feedback filed there): https://github.com/WICG/visual-viewport

- Primary contacts (and their relationship to the specification):
  - Daniel Libby, @dlibby-, Microsoft
  - Stephanie Stimac, @ststimac, Microsoft
  - Scott Low, @scottlow, Microsoft
- Organization/project driving the design: Microsoft
- External status/issue trackers for this feature (publicly visible, e.g. Chrome Status):

Further details:

- [x] I have reviewed the TAG's API Design Principles
- The group where the incubation/design work on this is being done (or is intended to be done in the future): WICG
- The group where standardization of this work is intended to be done ("unknown" if not known): Unknown
- Existing major pieces of multi-stakeholder review or discussion of this design:
- Major unresolved issues with or opposition to this design: N/A
- This work is being funded by: Microsoft

We'd prefer the TAG provide feedback as:

💬 leave review feedback as a comment in this issue and @-notify [github usernames]

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