First Public Working Draft: CSS Anchor Positioning

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The CSS Working Group has published a First Public Working Draft of CSS Anchor Positioning. This allows a positioned element (such as a tooltip or pop-up footnote) to size and position itself relative to one or more "anchor elements" elsewhere on the page. Because the anchoring element could have any size or position on the page, a flexible fallback scheme is also defined whereby a series of rules is tried until one is found that does not result in the positioned element overflowing its containing block.

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