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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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20
components/script/dom/html/htmlimageelement.rs
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@ -1926,6 +1926,7 @@ impl VirtualMethods for HTMLImageElement {
}
}
/// <https://html.spec.whatwg.org/multipage/#the-img-element:html-element-insertion-steps>
fn bind_to_tree(&self, context: &BindContext, can_gc: CanGc) {
if let Some(s) = self.super_type() {
s.bind_to_tree(context, can_gc);
@ -1935,23 +1936,24 @@ impl VirtualMethods for HTMLImageElement {
document.register_responsive_image(self);
}
// The element is inserted into a picture parent element
// https://html.spec.whatwg.org/multipage/#relevant-mutations
if let Some(parent) = self.upcast::<Node>().GetParentElement() {
if parent.is::<HTMLPictureElement>() {
self.update_the_image_data(can_gc);
}
let parent = self.upcast::<Node>().GetParentNode().unwrap();
// Step 1. If insertedNode's parent is a picture element, then, count this as a relevant
// mutation for insertedNode.
if parent.is::<HTMLPictureElement>() && std::ptr::eq(&*parent, context.parent) {
self.update_the_image_data(can_gc);
}
}
/// <https://html.spec.whatwg.org/multipage/#the-img-element:html-element-removing-steps>
fn unbind_from_tree(&self, context: &UnbindContext, can_gc: CanGc) {
self.super_type().unwrap().unbind_from_tree(context, can_gc);
let document = self.owner_document();
document.unregister_responsive_image(self);
// The element is removed from a picture parent element
// https://html.spec.whatwg.org/multipage/#relevant-mutations
if context.parent.is::<HTMLPictureElement>() {
// Step 1. If oldParent is a picture element, then, count this as a relevant mutation for
// removedNode.
if context.parent.is::<HTMLPictureElement>() && !self.upcast::<Node>().has_parent() {
self.update_the_image_data(can_gc);
}
}