Andreas Kling 77a3de4561 LibWeb: Handle ancestors without layout nodes in offsetParent ...

When walking the flat tree in HTMLElement::offset_parent(), ancestors
may not have layout nodes (e.g., they have display:none). This can
happen when an element is slotted into a shadow root where the slot
is inside a display:none container.

Guard layout_node() accesses with null checks. If an ancestor has no
layout node, it cannot be positioned or establish a containing block,
so it cannot be the offset parent for those reasons.

2026-02-21 22:08:36 +01:00

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