Tim Ledbetter f29bc0c996 LibWeb: Use scroll compensation for background-attachment: fixed ...

Instead of baking the current scroll offset into the background
positioning area at record time, use the `ScrollCompensation` visual
context node to negate ancestor scroll frames dynamically at replay
time. This keeps the background fixed relative to the viewport even
when the display list is cached and replayed at different scroll
positions, and works correctly with arbitrarily nested scroll
containers.

2026-05-08 13:09:40 +02:00

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