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LibWeb: Remove shadow roots from elements that are removed from the DOM

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We currently create a shadow tree once for each DOM element that renders
with a shadow tree (e.g. <input>, <details>). If such an element is
removed from the DOM, we must remove its shadow tree. Otherwise, the
shadow tree will refer to the old document in perpetuity.

If the node is added back to a DOM, then recreate the shadow tree.
This commit is contained in:
Timothy Flynn 2023-11-29 18:22:16 -05:00 • committed by Sam Atkins
parent 3cde479416
commit ff48b7333c
12 changed files with 67 additions and 3 deletions
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24
Userland/Libraries/LibWeb/HTML/HTMLDetailsElement.cpp
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@ -39,8 +39,17 @@ void HTMLDetailsElement::initialize(JS::Realm& realm)
{
Base::initialize(realm);
set_prototype(&Bindings::ensure_web_prototype<Bindings::HTMLDetailsElementPrototype>(realm, "HTMLDetailsElement"_fly_string));
}
create_shadow_tree(realm).release_value_but_fixme_should_propagate_errors();
void HTMLDetailsElement::inserted()
{
create_shadow_tree_if_needed().release_value_but_fixme_should_propagate_errors();
update_shadow_tree_slots();
}
void HTMLDetailsElement::removed_from(DOM::Node*)
{
set_shadow_root(nullptr);
}
void HTMLDetailsElement::attribute_changed(FlyString const& name, Optional<String> const& value)
@ -107,8 +116,13 @@ void HTMLDetailsElement::queue_a_details_toggle_event_task(String old_state, Str
}
// https://html.spec.whatwg.org/#the-details-and-summary-elements
WebIDL::ExceptionOr<void> HTMLDetailsElement::create_shadow_tree(JS::Realm& realm)
WebIDL::ExceptionOr<void> HTMLDetailsElement::create_shadow_tree_if_needed()
{
if (shadow_root_internal())
return {};
auto& realm = this->realm();
// The element is also expected to have an internal shadow tree with two slots.
auto shadow_root = heap().allocate<DOM::ShadowRoot>(realm, document(), *this, Bindings::ShadowRootMode::Closed);
shadow_root->set_slot_assignment(Bindings::SlotAssignmentMode::Manual);
@ -130,6 +144,9 @@ WebIDL::ExceptionOr<void> HTMLDetailsElement::create_shadow_tree(JS::Realm& real
void HTMLDetailsElement::update_shadow_tree_slots()
{
if (!shadow_root_internal())
return;
Vector<HTMLSlotElement::SlottableHandle> summary_assignment;
Vector<HTMLSlotElement::SlottableHandle> descendants_assignment;
@ -159,6 +176,9 @@ void HTMLDetailsElement::update_shadow_tree_slots()
// https://html.spec.whatwg.org/#the-details-and-summary-elements:the-details-element-6
void HTMLDetailsElement::update_shadow_tree_style()
{
if (!shadow_root_internal())
return;
if (has_attribute(HTML::AttributeNames::open)) {
MUST(m_descendants_slot->set_attribute(HTML::AttributeNames::style, R"~~~(
display: block;