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Last updated 2019-10-15 12:54:46
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.
The CSS WG has published a Proposed Recommendation of the CSS Containment Module Level 1. This CSS module describes the contain property, which indicates that the element’s subtree is independent of the rest of the page. This enables heavy optimizations by user agents when used well.
This document is intended to become a W3C Recommendation. This document will remain a Proposed Recommendation at least until 13 November 2019 in order to ensure the opportunity for wide review. The W3C Membership and other interested parties are invited to review the document and send comments. Advisory Committee Representatives should consult their WBS questionnaires.
Changes since the last Candidate Recommendation are listed in the Changes section.
A disposition of comments and implementation report are available.
The CSS WG has also published a First Public Wording Draft of the CSS Containment Module Level 2. This is initially identical to level 1 discussed above, except that it retains an at-risk feature that was dropped from level 1 during the CR period: style containment. This extends the concept—and benefits—of containment to features like the counter-increment property or content: open-quote, which can otherwise have effects on more than just an element and its descendants.
Please send feedback by either filing an issue in GitHub (preferable) or sending mail to the (archived) public mailing list www-style@w3.org with the spec code ([css-contain]) and your comment topic in the subject line. (Alternatively, you can email one of the editors and ask them to forward your comment.)