This is a page from the Cascading Style Sheets Working Group Blog. Some other places to find information are the “current work” page, the www-style mailing list, the Future of CSS syndicator, and the issue list on Github.
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.
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with at least values of auto and none and have it cascade separate from shorthand. We will have some normative text describe how auto works, but we’ll figure the details out in the future. Do this in L4.