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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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5
Userland/Libraries/LibWeb/HTML/HTMLTableRowElement.cpp
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@@ -42,9 +42,8 @@ JS::NonnullGCPtr<DOM::HTMLCollection> HTMLTableRowElement::cells() const
// The cells attribute must return an HTMLCollection rooted at this tr element,
// whose filter matches only td and th elements that are children of the tr element.
if (!m_cells) {
m_cells = DOM::HTMLCollection::create(const_cast<HTMLTableRowElement&>(*this), [this](Element const& element) {
return element.parent() == this
&& is<HTMLTableCellElement>(element);
m_cells = DOM::HTMLCollection::create(const_cast<HTMLTableRowElement&>(*this), DOM::HTMLCollection::Scope::Children, [](Element const& element) {
return is<HTMLTableCellElement>(element);
}).release_value_but_fixme_should_propagate_errors();
}
return *m_cells;