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.
The CSSWG recently published some updates to:
There’s also a new module in town, CSS Grid Layout
[css3-grid-layout], which attempts to integrate a number of layout features into CSS.
As always, send feedback to www-style with the appropriate
[spec-code] and your comment topic in the subject line.