Adam Colvin f79c3a4bfe LibWeb: Implement exportparts forwarding in part element map ...

Implement the forwarded part names step of the CSS Shadow Parts
spec in ShadowRoot::calculate_part_element_map(). When a shadow
host has an exportparts attribute, the inner shadow root's part
element map is consulted and matching parts are added to the
outer shadow root's map under the exported name.

This supports both shorthand same-name forwarding (exportparts=
"foo") and renamed forwarding (exportparts="foo: bar"), and
chains transitively through nested shadow boundaries via
recursive part_element_map() calls.

Fixes 4 WPT tests: simple-forward, simple-forward-shorthand,
double-forward, and precedence-part-vs-part.

2026-03-30 16:47:34 +01:00

32 KiB

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