CSS anchor positioning is approaching Baseline status with Safari 26 support joining Chrome, while Firefox implementation is in progress. Current browser implementations show differences in handling overflow behavior and position-try-fallback, with the CSSWG working on standardization. Upcoming changes include adjustments to popover UA styles, position-area syntax modifications, transform support, and anchored container queries. The CSS Anchor Positioning Polyfill v0.7.0 now supports shadow DOM elements.
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Shifting into the containing blockPosition fallback stabilitySimpler popover positioningOther changesPolyfill updateSort: