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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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4
Userland/Libraries/LibWeb/HTML/HTMLTableElement.cpp
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@ -264,7 +264,7 @@ JS::NonnullGCPtr<DOM::HTMLCollection> HTMLTableElement::t_bodies()
// The tBodies attribute must return an HTMLCollection rooted at the table node,
// whose filter matches only tbody elements that are children of the table element.
if (!m_t_bodies) {
m_t_bodies = DOM::HTMLCollection::create(*this, [](DOM::Element const& element) {
m_t_bodies = DOM::HTMLCollection::create(*this, DOM::HTMLCollection::Scope::Children, [](DOM::Element const& element) {
return element.local_name() == TagNames::tbody;
}).release_value_but_fixme_should_propagate_errors();
}
@ -307,7 +307,7 @@ JS::NonnullGCPtr<DOM::HTMLCollection> HTMLTableElement::rows()
// How do you sort HTMLCollection?
if (!m_rows) {
m_rows = DOM::HTMLCollection::create(*this, [table_node](DOM::Element const& element) {
m_rows = DOM::HTMLCollection::create(*this, DOM::HTMLCollection::Scope::Descendants, [table_node](DOM::Element const& element) {
// Only match TR elements which are:
// * children of the table element
// * children of the thead, tbody, or tfoot elements that are themselves children of the table element