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.
text-combine-mode property, and all values for text-combine-horizontal except none and all.
text-underline-position, text-emphasis-position, consistent with text-decoration (overline vs. underline).
Discussed rules for sizing under the case labelled available-width == unknown, what that means, and whether various parts of the sizing pseudo-algorithm should be removed. No conclusion.