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LibWeb/HTML: Add fastpath to skip selectedness update on option insert

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This extends the optimization introduced in the previous commit to
also apply to the inserted steps for an option element. This makes
the test:

https://wpt.live/html/select/options-length-too-large.html

Go from not ever completing due to how slow it was to running, to
finishing in 800ms on my PC :^)
This commit is contained in:
Shannon Booth 2025-01-27 13:35:18 +13:00 • committed by Andrew Kaster
commit ebd6d49415
Notes: github-actions[bot] 2025-01-30 20:56:39 +00:00
3 changed files with 22 additions and 14 deletions
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4
Libraries/LibWeb/HTML/HTMLOptionElement.cpp
View file

@ -234,9 +234,11 @@ void HTMLOptionElement::inserted()
// If insertedNode's parent is a select element,
// or insertedNode's parent is an optgroup element whose parent is a select element,
// then run that select element's selectedness setting algorithm.
if (auto select_element = owner_select_element())
if (auto select_element = owner_select_element()) {
if (!select_element->can_skip_selectedness_update_for_inserted_option(*this))
select_element->update_selectedness();
}
}
void HTMLOptionElement::removed_from(Node* old_parent, Node& old_root)
{

20
Libraries/LibWeb/HTML/HTMLSelectElement.cpp
View file

@ -293,15 +293,9 @@ i32 HTMLSelectElement::default_tab_index_value() const
return 0;
}
bool HTMLSelectElement::can_skip_children_changed_selectedness_update(ChildrenChangedMetadata const& metadata) const
bool HTMLSelectElement::can_skip_selectedness_update_for_inserted_option(HTMLOptionElement const& option) const
{
// If the following criteria are met, there is no need to re-run the selectedness algorithm.
// FIXME: We can tighten up these conditions and skip even more work!
if (metadata.type != ChildrenChangedMetadata::Type::Inserted)
return false;
if (auto* option = as_if<HTMLOptionElement>(*metadata.node)) {
if (option->selected())
if (option.selected())
return false;
if (m_cached_number_of_selected_options >= 2)
@ -313,6 +307,16 @@ bool HTMLSelectElement::can_skip_children_changed_selectedness_update(ChildrenCh
return true;
}
bool HTMLSelectElement::can_skip_children_changed_selectedness_update(ChildrenChangedMetadata const& metadata) const
{
// If the following criteria are met, there is no need to re-run the selectedness algorithm.
// FIXME: We can tighten up these conditions and skip even more work!
if (metadata.type != ChildrenChangedMetadata::Type::Inserted)
return false;
if (auto* option = as_if<HTMLOptionElement>(*metadata.node))
return can_skip_selectedness_update_for_inserted_option(*option);
return false;
}

2
Libraries/LibWeb/HTML/HTMLSelectElement.h
View file

@ -98,6 +98,8 @@ public:
void update_inner_text_element(Badge<HTMLOptionElement>);
bool can_skip_selectedness_update_for_inserted_option(HTMLOptionElement const&) const;
private:
HTMLSelectElement(DOM::Document&, DOM::QualifiedName);