CSS WG Blog CSS Anchor Positioning Level 1 Updated Wor…

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CSS Anchor Positioning Level 1 Updated Working Draft

By fantasai October 7, 2025 (Permalink)
Categories: publications

The CSS Working Group has published an updated Working Draft of CSS Anchor Positioning Level 1. This specification extends absolute positioning to allow a box to size and position itself relative to one or more “anchor boxes” elsewhere on the page. See previous draft announcement.

This update adds a number of refinements since the previous Working Draft, including some changes to default alignment behavior and renaming the x/y-self- keywords in position-area to self-x/y-. Changes since the last Working Draft are listed in the Changes section.

(We also published updates to CSS Positioned Layout Level 3, CSS Positioned Layout Level 4, and CSS Overflow Level 3 to fix some minor issues and ensure proper cross-linking across these four specs.)

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-anchor-position-1]) and your comment topic in the subject line. (Alternatively, you can email one of the editors and ask them to forward your comment.)

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Last updated 2025-10-07 04:42:49