CSS Sticky Positioning and Paint Property Trees
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This documentation details how the Blink rendering engine manages CSS sticky positioning through its PrePaint and paint property tree workflows. During the PrePaint phase, the engine identifies sticky elements and calculates their geometric constraints based on the current scroll state to determine exactly how they should shift. A specialized StickyTranslation node is then integrated into the transform tree, allowing the element to move reactively without requiring a full layout reflow. The system leverages compositing to ensure smooth performance, attaching constraints to the compositor so updates can occur independently of the main thread. Additionally, the sources explain how PaintLayers and LayoutNG fragments coordinate to maintain correct stacking contexts and visual consistency across complex layouts. Overall, the text illustrates a highly optimized pipeline that treats stickiness as a dynamic transform adjustment rather than a static layout property.
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