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html: Properly count <image>/<source> insertion/removal steps as the relevant mutations (#39452)

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Follow the HTML specification and take into account that the HTML
`<image>/<source>` element inserting/removal steps should only be
counted as relevant mutations for `<image>` element if the parent of the
inclusive ancestor that was inserted/removed is the parent `<picture>`
element.

See <https://html.spec.whatwg.org/multipage/#relevant-mutations>.

Testing: Improvements in the following tests
-
html/semantics/embedded-content/the-img-element/relevant-mutations.html

Signed-off-by: Andrei Volykhin <andrei.volykhin@gmail.com>
This commit is contained in:
Andrei Volykhin 2025-09-23 15:40:03 +03:00 • committed by GitHub
parent c63311af02
commit 99fbd36b5d
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6 changed files with 75 additions and 71 deletions
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6
components/script/dom/element.rs
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@ -737,11 +737,7 @@ impl Element {
.upcast::<Node>()
.set_containing_shadow_root(Some(&shadow_root));
let bind_context = BindContext {
tree_connected: self.upcast::<Node>().is_connected(),
tree_is_in_a_document_tree: self.upcast::<Node>().is_in_a_document_tree(),
tree_is_in_a_shadow_tree: true,
};
let bind_context = BindContext::new(&self.node);
shadow_root.bind_to_tree(&bind_context, can_gc);
let node = self.upcast::<Node>();