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Assert that style element has an owner in parse_own_css (#39458)

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The existing `assert!(node.is_connected())` is wrong. What it *wants* to
assert is that the style element has an owner, which is either a
Document or a ShadowRoot that the element is a descendant of. However,
if the element is descendant of a ShadowRoot which is itself not
connected to a document then the assertion would fail.

Instead, we use `node.is_in_a_document_tree() ||
node.is_in_a_shadow_tree()`, which more accurately reflects the intent.

Testing: This change adds the test case from
https://github.com/servo/servo/issues/37781 as a crashtest
Fixes https://github.com/servo/servo/issues/39457
Fixes https://github.com/servo/servo/issues/37781

---------

Signed-off-by: Simon Wülker <simon.wuelker@arcor.de>
This commit is contained in:
Simon Wülker 2025-09-24 01:00:11 +02:00 • committed by GitHub
parent dd8e4f231c
commit 206dcff080
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3 changed files with 27 additions and 1 deletions
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5
components/script/dom/html/htmlstyleelement.rs
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@ -97,7 +97,10 @@ impl HTMLStyleElement {
pub(crate) fn parse_own_css(&self) {
let node = self.upcast::<Node>();
assert!(node.is_connected());
assert!(
node.is_in_a_document_tree() || node.is_in_a_shadow_tree(),
"This stylesheet does not have an owner, so there's no reason to parse its contents"
);
// Step 4. of <https://html.spec.whatwg.org/multipage/#the-style-element%3Aupdate-a-style-block>
let mut type_attribute = self.Type();