[css-2025][css-scroll-anchoring-1] Add CSS Scroll Anchoring to Rough Interop

[SebastianZ]

Splitting the discussion from #9793 for adding CSS Scroll Anchoring 1 to the Modules with Rough Interoperability section of the CSS Snapshot 2025.

Data to consider:

Current status: WD (last published: 11 November 2020), ED from 16 June 2025
WPT: passing tests (experimental): Chrome: 86, Edge: 89, Firefox: 86, Safari: 25; interop: 24 / 92 (26.1%), 84 / 92 (91.3%) for Chrome, Edge, and Firefox
Current Snapshot section: -
Open issues: on GitHub: 17 (~12 substantial for that level), in spec.: 0

Summary: Very high interoperability between two engines

Note: Implementations agree on main use cases

Sebastian

[SebastianZ]

I obviously missed that it is already in the Snapshot as per resolution.

Sebastian