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.
[max-]width|height and intrinsic sizes.display:contents could be addressed.display:contents:
display:none when you do display:contentsdisplay:none on form elements and box stripping on others.display:contents treated as display:none for replaced elements and form controls.align-self:auto and justify-self:auto still look at parent’s align and justify items for abspos when calculating static position only.