Andreas Kling 0c58a6f322 LibWeb: Use slot's shadow host when matching ::slotted() selectors ...

When matching selectors like `:host ::slotted(div)`, the selector
engine needs to traverse up from the slot element to reach the shadow
host for `:host` matching. Previously, we passed shadow_host_to_use
which was derived from the *slotted element's* DOM position. For
elements in the light DOM (not inside any shadow root), this was null,
causing traverse_up() to use parent() instead of
parent_or_shadow_host_element(). This meant the traversal could never
cross the shadow boundary from inside the shadow tree to reach the
host element.

Fix this by deriving the shadow host from the slot's containing shadow
root, which is the correct scope for combinator traversal within
::slotted() rule matching.

2026-03-21 21:42:44 -05:00

150 KiB

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