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position-anchor CSS Property
The position-anchor property associates a positioned element with a specific anchor element, so it can position itself relative to that anchor via anchor() and position-area. The anchor's name comes from the target's anchor-name.
.tooltip {
position-anchor: --trigger;
}
.menu {
position: fixed;
position-anchor: --menu-btn;
top: anchor(bottom);
left: anchor(left);
}
normalDefault. Behaves as none if position-area is none; otherwise as auto.autoUses the element's implicit anchor, if one exists.noneNo default anchor for the element.match-parentUses the parent's default anchor when applicable.
CSS Anchor Positioning Module Level 1
Editor's Draft
<anchor-name>
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