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LibWeb: Only react to link element attribute changes when BC connected

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Link elements that aren't "browsing-context connected" should not
trigger a resource fetch when their attributes change.

This fixes an issue where we'd waste time by loading every style sheet
twice! :^)
This commit is contained in:
Andreas Kling
2024-04-26 09:29:27 +02:00
parent 7339409575
commit a4625e3943
3 changed files with 22 additions and 11 deletions
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24
Userland/Libraries/LibWeb/HTML/HTMLLinkElement.cpp
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@@ -134,17 +134,19 @@ void HTMLLinkElement::attribute_changed(FlyString const& name, Optional<String>
// https://html.spec.whatwg.org/multipage/links.html#link-type-stylesheet:fetch-and-process-the-linked-resource
// The appropriate times to fetch and process this type of link are:
if (
// AD-HOC: When the rel attribute changes
name == AttributeNames::rel ||
// - When the href attribute of the link element of an external resource link that is already browsing-context connected is changed.
name == AttributeNames::href ||
// - When the disabled attribute of the link element of an external resource link that is already browsing-context connected is set, changed, or removed.
name == AttributeNames::disabled ||
// - When the crossorigin attribute of the link element of an external resource link that is already browsing-context connected is set, changed, or removed.
name == AttributeNames::crossorigin
// FIXME: - When the type attribute of the link element of an external resource link that is already browsing-context connected is set or changed to a value that does not or no longer matches the Content-Type metadata of the previous obtained external resource, if any.
// FIXME: - When the type attribute of the link element of an external resource link that is already browsing-context connected, but was previously not obtained due to the type attribute specifying an unsupported type, is removed or changed.
) {
is_browsing_context_connected()
&& (
// AD-HOC: When the rel attribute changes
name == AttributeNames::rel ||
// - When the href attribute of the link element of an external resource link that is already browsing-context connected is changed.
name == AttributeNames::href ||
// - When the disabled attribute of the link element of an external resource link that is already browsing-context connected is set, changed, or removed.
name == AttributeNames::disabled ||
// - When the crossorigin attribute of the link element of an external resource link that is already browsing-context connected is set, changed, or removed.
name == AttributeNames::crossorigin
// FIXME: - When the type attribute of the link element of an external resource link that is already browsing-context connected is set or changed to a value that does not or no longer matches the Content-Type metadata of the previous obtained external resource, if any.
// FIXME: - When the type attribute of the link element of an external resource link that is already browsing-context connected, but was previously not obtained due to the type attribute specifying an unsupported type, is removed or changed.
)) {
fetch_and_process_linked_resource();
}
}