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.
@font-facewill be same-origin by default with the use of CORS to relax for HTTP
min-contentis not an implied minimum.
flex-align: stretch, honor
max-width, then start-align.
break-before:columnwon’t force a blank column when the element is the first in the column.
page-break-before/afterdoesn’t create a break if you’re at the top of the page, where at the top of the page means no content has been placed. Borders do not count as content. Zero-height elements count as content.