[w3ctag/design-reviews] Early design review of light-DOM CSS Scope proposal (#593)

HIQaH! QaH! TAG!

I'm requesting early TAG review of my proposal for light-DOM CSS Scope.

Previous scope proposals have attempted to address highly-isolated use-cases along side the more light-touch issues of namespacing and selector-proximity. Those attempts were largely abandoned in favor of Shadow-DOM solutions -- which strongly prioritize strong isolation. In the meantime, third-party tools (eg CSS Modules) and conventions (eg BEM) are more often used by authors to provide low-isolation scoping for light-DOM components. I'm proposing a native CSS approach to those use-cases.

- Explainer: https://github.com/oddbird/css-sandbox/blob/main/src/scope/explainer.md

- Security and Privacy self-review: This proposal does not expose anything new, and has no impact on security or privacy
- Primary contacts (and their relationship to the specification):
    - Miriam Suzanne, @mirisuzanne, Invited Expert, author
    - Mason Freed, @mfreed7, Google, contributor
    - Yu Han, @yuzhe-han, Google, contributor
    - Rune Lillesveen, @lilles, Google, contributor
    - Rossen Atanassof, @atanassov, Microsoft, co-chair
    - Alan Stearns @astearns, Adobe, co-chair
- Organization/project driving the design: CSSWG
- External status/issue trackers for this feature (publicly visible, e.g. Chrome Status):
    - [Chrome Intent to Prototype](https://groups.google.com/a/chromium.org/g/blink-dev/c/u1AKdrXhPGI/m/wrJb-unhAgAJ?pli=1)

Further details:

- [x] I have reviewed the TAG's [API Design Principles](https://w3ctag.github.io/design-principles/)
- The group where the incubation/design work on this is being done (or is intended to be done in the future): CSSWG
- The group where standardization of this work is intended to be done ("unknown" if not known): CSSWG
- Existing major pieces of multi-stakeholder review or discussion of this design: [CSSWG Issue](https://github.com/w3c/csswg-drafts/issues/5809)
- Major unresolved issues with or opposition to this design: No known opposition
- This work is being funded by: Google

We'd prefer the TAG provide feedback as 💬 leave review feedback as a **comment in this issue** and @-notify @mirisuzanne and @lilles


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