[w3ctag/design-reviews] Foldable Device CSS Primitives (Issue #690)

Braw mornin' TAG!

I'm requesting a TAG review of Foldable Device CSS Primitives after taking into account feedback (w3c/csswg-drafts#5621 and w3c/csswg-drafts#5622) on our original Foldables CSS proposal (initial TAG review here: #472)

In order to enable web developers to build layouts that are optimized for foldable experiences declaratively using CSS, we must consider fundamental assumptions of CSS (i.e. a single contiguous rectangular space for laying out content) and introduce new primitives that -together with existing layout media queries- allow developers to create layouts that react to states where the root viewport spans multiple displays.

  - Explainer¹ (minimally containing user needs and example code): https://github.com/MicrosoftEdge/MSEdgeExplainers/blob/main/Foldables/explainer.md

  - Specification URLs:
      - Media Queries: https://drafts.csswg.org/mediaqueries-5/#mf-horizontal-viewport-segments

      - Environment Variables: https://drafts.csswg.org/css-env-1/#viewport-segments

  - Security and Privacy self-review²: https://github.com/MicrosoftEdge/MSEdgeExplainers/issues/187

  - GitHub repo (if you prefer feedback filed there):
  - 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 [Web Platform Design Principles](https://www.w3.org/TR/design-principles/)
  - The group where the work on this specification is currently being done: CSSWG
  - Major unresolved issues with or opposition to this specification: N/A
  - This work is being funded by: Microsoft

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 [github usernames]

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