[csswg][css-gaps-1] Updated WD of CSS Gap Decorations Level 1

The CSS WG has published an updated Working Draft of the CSS Gap Decorations Module Level 1:

https://www.w3.org/TR/2026/WD-css-gaps-1-20260227/

This module builds upon existing support for column rules in multicolumn layout. It extends support for gap decorations to other container layout types such as grid and flex. It also introduces several new properties to support decorations in the row direction, as well as additional controls such as styling and placement variations.

This updated draft includes one major change and two new major features since the FPWD:
- The former -outset properties are now -inset, with semantics adjusted accordingly.
- Authors can now specify varying decoration offsets for edges vs. interior intersections, and start vs. end sides.
- Authors can now control visibility of gap decorations next to empty areas using the *-rule-visibility-items property.

A number of smaller changes based on author feedback and CSSWG discussion are also included. A complete list of changes can be found at:
https://www.w3.org/TR/2026/WD-css-gaps-1-20260227/#changes-20250417

Please send feedback by either filing an issue in GitHub<https://github.com/w3c/csswg-drafts/issues> (preferable) or sending mail to the (archived<http://lists.w3.org/Archives/Public/www-style/>) public mailing list www-style@w3.org<mailto:www-style@w3.org?Subject=%5Bcss-anchor-position-1%5D%20PUT%20SUBJECT%20HERE> with the spec code ([css-gaps-1]) and your comment topic in the subject line.

For the CSS WG,
Kevin Babbitt