<anchor-size>
A function that retrieves the width or height of the anchor element. It's incredibly useful for making a popup or menu match the exact dimensions of the button that triggered it.
Quick example
.tooltip {
/* Makes the tooltip exactly as wide as its anchor */
width: anchor-size(width);
position: absolute;
}<anchor-size> Browser Support
Limited availability 77% global usage
This feature is not Baseline because it does not work in some of the most widely-used browsers.
Not ready for production without a fallback.
125+
125+