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.
overflow: repeat/regions draft as ED work item
auto margins in grid layout behave like they do in flexbox
overflow on a table element applies to the table box (not table wrapper box); and that values other than hidden are treated as visible.