Add guidelines for CSS support data #28913
Description
What would you like to see added to BCD?
BCD contains support data for CSS at-rules, CSS properties, CSS selectors, and CSS types, but we don't have guidelines for CSS.
In the BCD meeting on 2026-01-20, I asked:
How to record CSS data types correctly?
Example: #28838
How impactful do you think this enhancement will be?
The guidelines will make it easier for to triage issues, author data, and review PRs.
Do you have anything more you want to share?
No response