[w3ctag/design-reviews] Incubation: @supports at-rule (Issue #1176)

diekus created an issue (w3ctag/design-reviews#1176)

### Explainer

https://github.com/MicrosoftEdge/MSEdgeExplainers/blob/main/AtRuleFeatureDetection/explainer.md

### The explainer

- [x] Includes the information requested by the [Explainer Explainer](https://w3ctag.github.io/explainer-explainer/#introduction).
- [x] Follows the [Web Platform Design Principles](https://www.w3.org/TR/design-principles/).
- [x] Includes or links to answers to the [Security/Privacy Questionnaire](https://www.w3.org/TR/security-privacy-questionnaire/).
- [x] Describes user research you did to validate the problem and/or design.

### Where and by whom is the work is being done?

- GitHub repo: https://github.com/MicrosoftEdge/MSEdgeExplainers/tree/main/AtRuleFeatureDetection
- Primary contacts:
  - Kevin Babbit (@kbabbit), Microsoft, Software Engineer
  - Diego Gonzalez (@diekus), Microsoft, Program Manager
- Organization/project driving the design:
- This work is being funded by: Microsoft
- Incubation and standards groups that have discussed the design:
  - CSSWG [F2F August 2025](https://github.com/w3c/csswg-drafts/issues/11116)
- Standards group(s) that you expect to discuss and/or adopt this work when it's
  ready: CSSWG


### Feedback so far

- Multi-stakeholder feedback:
  - Chromium comments:
  - Mozilla comments: https://github.com/mozilla/standards-positions/issues/1310 
  - WebKit comments: https://github.com/WebKit/standards-positions/issues/565


### You should also know that...

_No response_

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