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6e17503423
In the current spec, MutationObservers are explicitly added to the pending mutation observers list, and they are removed when that list is cleared in the "notify mutation observers" microtask. This solves some issues with slotchange events. As noted, we delay actually emptying the list of pending mutation observers until after we're finished with the "clone", because we can't actually copy or move the intrusive list. As far as I am aware, this should not affect behaviour because only one microtask can run at once.
56 lines
2.4 KiB
C++
56 lines
2.4 KiB
C++
/*
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* Copyright (c) 2025, Shannon Booth <shannon@serenityos.org>
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*
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* SPDX-License-Identifier: BSD-2-Clause
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*/
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#pragma once
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#include <AK/OwnPtr.h>
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#include <AK/Vector.h>
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#include <LibGC/Root.h>
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#include <LibJS/Forward.h>
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#include <LibJS/Runtime/Agent.h>
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#include <LibWeb/DOM/MutationObserver.h>
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#include <LibWeb/Export.h>
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#include <LibWeb/Forward.h>
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#include <LibWeb/HTML/CustomElements/CustomElementReactionsStack.h>
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#include <LibWeb/HTML/Scripting/Agent.h>
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namespace Web::HTML {
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// https://html.spec.whatwg.org/multipage/webappapis.html#similar-origin-window-agent
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struct SimilarOriginWindowAgent : public Agent {
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static NonnullOwnPtr<SimilarOriginWindowAgent> create(GC::Heap&);
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// https://dom.spec.whatwg.org/#mutation-observer-compound-microtask-queued-flag
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// Each similar-origin window agent has a mutation observer microtask queued (a boolean), which is initially false. [HTML]
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bool mutation_observer_microtask_queued { false };
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// https://dom.spec.whatwg.org/#mutation-observer-list
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// Each similar-origin window agent also has pending mutation observers (a set of zero or more MutationObserver objects), which is initially empty.
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DOM::MutationObserver::List pending_mutation_observers;
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// https://html.spec.whatwg.org/multipage/custom-elements.html#custom-element-reactions-stack
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// Each similar-origin window agent has a custom element reactions stack, which is initially empty.
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CustomElementReactionsStack custom_element_reactions_stack {};
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// https://dom.spec.whatwg.org/#signal-slot-list
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// Each similar-origin window agent has signal slots (a set of slots), which is initially empty. [HTML]
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Vector<GC::Root<HTML::HTMLSlotElement>> signal_slots;
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// https://html.spec.whatwg.org/multipage/custom-elements.html#current-element-queue
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// A similar-origin window agent's current element queue is the element queue at the top of its custom element reactions stack.
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Vector<GC::Root<DOM::Element>>& current_element_queue() { return custom_element_reactions_stack.element_queue_stack.last(); }
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Vector<GC::Root<DOM::Element>> const& current_element_queue() const { return custom_element_reactions_stack.element_queue_stack.last(); }
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private:
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explicit SimilarOriginWindowAgent(CanBlock can_block)
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: Agent(can_block)
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{
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}
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};
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WEB_API SimilarOriginWindowAgent& relevant_similar_origin_window_agent(JS::Object const&);
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}
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