[w3ctag/design-reviews] WG Revision: Selectors 4 (Issue #1221)

svgeesus created an issue (w3ctag/design-reviews#1221)

### Specification

https://www.w3.org/TR/selectors-4/

### Explainer

https://github.com/w3c/csswg-drafts/blob/main/selectors-4/Selectors_4_Explainer.md

### Links

- The WG's request for this TAG review:  
  - https://github.com/w3c/csswg-drafts/issues/12799#issuecomment-3628969842

- TAG review of the previous version of this specification, if any: 
  - https://github.com/w3ctag/design-reviews/issues/219
  - https://github.com/w3ctag/design-reviews/issues/233
  - https://github.com/w3ctag/design-reviews/issues/709
  - https://github.com/w3ctag/design-reviews/issues/1010
  - https://github.com/w3ctag/design-reviews/issues/998

- A description of what has changed since our previous review: 
  - see [Explainer, What is new in Selectors 4](https://github.com/w3c/csswg-drafts/blob/main/selectors-4/Selectors_4_Explainer.md#what-is-new-in-selectors-4)


- Web Platform Tests:  <!-- Or other tests if this is not a web platform feature. -->
  - https://wpt.fyi/results/css/selectors/ 

<img width="1157" height="217" alt="Image" src="https://github.com/user-attachments/assets/26e5009b-04f9-47f8-98f5-0ccaaa5c8be7" />


### The specification

- [x] Follows the [Web Platform Design Principles](https://www.w3.org/TR/design-principles/).
- [x] Includes Security and Privacy Considerations sections based on answers to the [Security/Privacy Questionnaire](https://www.w3.org/TR/security-privacy-questionnaire/).

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

- GitHub repo: https://github.com/w3c/csswg-drafts
- Primary contacts:
  - Elika Etemad @fantasai Editor
  - Tab Atkins @tabatkins Editor
  - Chris Lilley @svgeesus Staff Contact
  - Alan Stearns @astearns  Co-Chair

- Primary standards group developing this feature: W3C CSS WG



### Feedback so far

- Active horizontal reviews: 
  - https://github.com/w3c/csswg-drafts/issues/13469
- Multi-stakeholder feedback:
  - Selectors 4 is implemented in Chrome, Firefox, and  Safari; also in Ladybird and Servo
  - [WPT results for those five](https://wpt.fyi/results/css/selectors?label=master&product=chrome%5Bexperimental%5D&product=edge%5Bexperimental%5D&product=firefox%5Bexperimental%5D&product=safari%5Bexperimental%5D&product=ladybird&product=servo&aligned)
- Major unresolved issues with or opposition to this specification:
  - No opposition
  - [Some minor issues being resolved](https://github.com/issues?q=is%3Aissue%20involves%3A%40me%20updated%3A%3E%40today-1w%20sort%3Aupdated-desc%20label%3Aselectors-4)



### You should also know that...

This mature and widely implemented specification is now being readied for a CR Snapshot before proceeding to W3C Recommendation. Newer work is in Selectors 5, which is outside the scope of this review.

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