Do you want to know how the CSS WG works? Fantasai has written about:csswg, An Inside View of the CSS Working Group at W3C.
Noted: General agreement that the current CSSOM is badly designed and should be extended, but standardizing existing interfaces is the priority right now.
Resolved: CSS specs below CR level should add canonicalization info to their property definitions once a canonicalization table for existing properties has been created.
Resolved: If the CSSWG chooses to specify CSSOM interfaces for editors, that will be a separate spec from the main CSSOM.