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LibWeb: Make HTMLCollection faster when it only cares about children

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Some of the live HTMLCollection only ever contain children of their root
node. When we know that's the case, we can avoid doing a full subtree
traversal of all descendants and only visit children.

This cuts the ECMA262 spec loading time by over 10 seconds. :^)
This commit is contained in:
Andreas Kling 2023-05-23 11:25:07 +02:00
parent e31f696ee6
commit df1bb0ff49
10 changed files with 54 additions and 41 deletions
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2
Userland/Libraries/LibWeb/HTML/HTMLFormElement.cpp
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@ -244,7 +244,7 @@ static bool is_form_control(DOM::Element const& element)
JS::NonnullGCPtr<DOM::HTMLCollection> HTMLFormElement::elements() const
{
if (!m_elements) {
m_elements = DOM::HTMLCollection::create(const_cast<HTMLFormElement&>(*this), [](Element const& element) {
m_elements = DOM::HTMLCollection::create(const_cast<HTMLFormElement&>(*this), DOM::HTMLCollection::Scope::Descendants, [](Element const& element) {
return is_form_control(element);
}).release_value_but_fixme_should_propagate_errors();
}