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[css-2025][css-conditional-4] Add CSS Conditional 4 to Reliable CRs #12694

@SebastianZ

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@SebastianZ

Splitting the discussion from #9770 for adding CSS Conditional 4 to the Reliable Candidate Recommendations section of the CSS Snapshot 2025.

Data to consider:

Current status: CR (last published: 17 February 2022), ED from 31 August 2025
WPT: passing tests (stable): Chrome: 3041, Edge: 3109, Firefox: 2671, Safari: 2839; interop: 2622 / 3202 (81.9%)
Current Snapshot section: Rough Interoperability
Open issues: on GitHub: 4, in spec.: 1

Summary: High interoperability, spec. in CR, few open issues

Notes: This spec. is currently still a delta spec. against Level 3. And Level 3 is currently part of the Official Definition.

Sebastian

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