[CSSWG][css-anchor-position-1] Updated WD of CSS Anchor Positioning L1

The CSS WG has published an updated Working Draft of the CSS Anchor
Positioning Module Level 1:

      https://www.w3.org/TR/css-anchor-position-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.

This update adds a number of refinements since the previous Working Draft, 
including:

     * Renaming the x/y-self-start/end to self-x/y-start/end due to
       persistent confusion about the ordering.

     * Making position-area use the scrollable containing block when
       attaching to a scroll container.

     * Adjusting the default position-area alignment to honor single-auto
       insets by aligning to the non-auto side.

     * Accounting for transforms of the anchor box.

     * A wide variety of fixes and clarifications.

Significant changes are listed at:

     https://www.w3.org/TR/2025/WD-css-anchor-position-1-20251007/#changes

We expect another few similar rounds of improvements as we drill down the 
number of issues with the spec.

Please review the draft, and send any comments to this mailing list,
<www-style@w3.org>, prefixed with [css-anchor-position-1] (as I did on this
message) or (preferably) file them in the GitHub repository at
    https://github.com/w3c/csswg-drafts/issues

For the CSS WG,
~fantasai

Received on Tuesday, 7 October 2025 04:33:07 UTC