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.
document.scrollingElement but add more definitionjustify-content: stretch computes to stretch but behaves like start
position: center from Positioned Layoutposition: page. Also update the short name.position: page and it will likely become a F2F topic in NYC.user-modify in CSS UI 4