[css-contain][CSSWG] CR of CSS Contain L1

The CSS WG has published a Candidate Recommendation and invites implementations 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 is the first CR of this drafts. Implementations are encouraged, and feedback based on them much welcome. In particular, comments about interaction with other specifications would be very welcome, and you find desirable optimization opportunities that this technology fails to facilitate, the CSSWG would like to hear from you.

Significant changes are listed at:


Disposition of comments:

Please review the draft, and send any comments to this mailing list,
<www-style@w3.org>, prefixed with [css-contain] (as I did on this
message) or (preferably) file them in the GitHub repository at

For the CSS WG,
—Florian Rivoal

Received on Tuesday, 8 August 2017 16:46:02 UTC