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.
display
value, are promoted to being flex items when placed in a flex container.
vmax
unit.
calc()
inside calc()
allowed.
overflow
applies to table elements.