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, and the Future of CSS syndicator.
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)