LibWeb: Make HTMLCollection faster when it only cares about children

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. :^)

1 files changed, 2 insertions, 2 deletions

diff --git a/Userland/Libraries/LibWeb/HTML/HTMLTableElement.cpp b/Userland/Libraries/LibWeb/HTML/HTMLTableElement.cpp
index 8f8a3281c3..41b20d8cb0 100644
--- a/Userland/Libraries/LibWeb/HTML/HTMLTableElement.cpp
+++ b/Userland/Libraries/LibWeb/HTML/HTMLTableElement.cpp
@@ -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