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Support exporting shadow parts with the exportparts attribute (#37345)

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The attribute is implemented as a new `AttrValue` variant containing the
mappings of exported part names
(https://github.com/servo/stylo/pull/197).

Take a look at the [MDN
page](https://developer.mozilla.org/en-US/docs/Web/HTML/Reference/Global_attributes/exportparts)
for more information about the attribute.


Testing: Covered by WPT
Fixes: https://github.com/servo/servo/issues/35349

---------

Signed-off-by: Simon Wülker <simon.wuelker@arcor.de>
This commit is contained in:
Simon Wülker 2025-06-13 13:32:20 +02:00 • committed by GitHub
parent 730fe35b42
commit 6cac782fb1
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12 changed files with 42 additions and 45 deletions
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1
components/script/dom/element.rs
View file

@ -4226,6 +4226,7 @@ impl VirtualMethods for Element {
local_name!("class") | local_name!("part") => {
AttrValue::from_serialized_tokenlist(value.into())
},
local_name!("exportparts") => AttrValue::from_shadow_parts(value.into()),
_ => self
.super_type()
.unwrap()

23
components/script/layout_dom/element.rs
View file

@ -307,6 +307,21 @@ impl<'dom> style::dom::TElement for ServoLayoutElement<'dom> {
}
}
fn each_exported_part<F>(&self, name: &AtomIdent, callback: F)
where
F: FnMut(&AtomIdent),
{
let Some(exported_parts) = self
.element
.get_attr_for_layout(&ns!(), &local_name!("exportparts"))
else {
return;
};
exported_parts
.as_shadow_parts()
.for_each_exported_part(AtomIdent::cast(name), callback);
}
fn has_dirty_descendants(&self) -> bool {
unsafe {
self.as_node()
@ -751,8 +766,12 @@ impl<'dom> ::selectors::Element for ServoLayoutElement<'dom> {
)
}
fn imported_part(&self, _: &AtomIdent) -> Option<AtomIdent> {
None
fn imported_part(&self, name: &AtomIdent) -> Option<AtomIdent> {
self.element
.get_attr_for_layout(&ns!(), &local_name!("exportparts"))?
.as_shadow_parts()
.imported_part(name)
.map(|import| AtomIdent::new(import.clone()))
}
#[inline]