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.
and, or, and not keywords in @supports syntax.
animation-play-state in shorthand
display: none
animation-play-state back into the animation shorthand, and let the shorthand reset it if not mentioned.