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.
:first-line
/::first-letter
don’t apply to flex containers. Could revisit later if this is in high demand. (Issue 13)
overflow
applies to flex containers
Discussed top layer positioning (as used for fullscreen) and how it can be accessed via CSS. Seems that nobody’s really clear on exactly how it’s supposed to work wrt positioning and scrolling behavior [?] and more investigation is needed on what the “magic” requirements of HTML5 actually should be.