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.
cx, cy, dx, dy, fx, fy, height, width, offset, r, rx, ry, x, x1, x2, y, y1, y2 and maybe d