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.
text-overflow:ellipsis
outlined in Tantek’s email
!important
in animations rules – it’s a syntax error.
!important
rules to override animations (exact location of animations in the cascade level still undetermined)