The W3C's home for CSS: what the working group is doing, its specs and how they're made.

This is the W3C CSS Working Group's home page, the group that writes the CSS specifications. It lists completed specs, stable drafts and current work, along with news of new draft publications.
It explains how to take part: file issues in the w3c/csswg-drafts GitHub repo, read meeting minutes on the www-style mailing list, or join the group through a W3C member organisation.
It also links to the yearly CSS Snapshots, the CSS validator and learning resources.