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+/*
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+ * Copyright (c) 2023, 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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+
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+#include <LibWeb/Bindings/Intrinsics.h>
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+#include <LibWeb/DOM/Element.h>
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+#include <LibWeb/DOM/HTMLCollection.h>
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+#include <LibWeb/DOM/HTMLFormControlsCollection.h>
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+#include <LibWeb/DOM/ParentNode.h>
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+
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+namespace Web::DOM {
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+
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+JS::NonnullGCPtr<HTMLFormControlsCollection> HTMLFormControlsCollection::create(ParentNode& root, Scope scope, Function<bool(Element const&)> filter)
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+{
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+ return root.heap().allocate<HTMLFormControlsCollection>(root.realm(), root, scope, move(filter));
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+}
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+
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+HTMLFormControlsCollection::HTMLFormControlsCollection(ParentNode& root, Scope scope, Function<bool(Element const&)> filter)
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+ : HTMLCollection(root, scope, move(filter))
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+{
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+}
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+
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+HTMLFormControlsCollection::~HTMLFormControlsCollection() = default;
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+
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+void HTMLFormControlsCollection::initialize(JS::Realm& realm)
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+{
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+ Base::initialize(realm);
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+ set_prototype(&Bindings::ensure_web_prototype<Bindings::HTMLFormControlsCollectionPrototype>(realm, "HTMLFormControlsCollection"));
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+}
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+
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+// https://html.spec.whatwg.org/multipage/common-dom-interfaces.html#dom-htmlformcontrolscollection-nameditem
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+Variant<Empty, Element*, JS::Handle<RadioNodeList>> HTMLFormControlsCollection::named_item_or_radio_node_list(FlyString const& name)
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+{
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+ // 1. If name is the empty string, return null and stop the algorithm.
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+ if (name.is_empty())
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+ return {};
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+
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+ auto const deprecated_name = name.to_deprecated_fly_string();
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+
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+ // 2. If, at the time the method is called, there is exactly one node in the collection that has either an id attribute or a name attribute equal to name, then return that node and stop the algorithm.
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+ // 3. Otherwise, if there are no nodes in the collection that have either an id attribute or a name attribute equal to name, then return null and stop the algorithm.
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+ Element* matching_element = nullptr;
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+ bool multiple_matching = false;
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+
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+ auto collection = collect_matching_elements();
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+ for (auto const& element : collection) {
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+ if (element->attribute(HTML::AttributeNames::id) != deprecated_name && element->name() != deprecated_name)
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+ continue;
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+
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+ if (matching_element) {
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+ multiple_matching = true;
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+ break;
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+ }
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+
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+ matching_element = element;
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+ }
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+
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+ if (!matching_element)
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+ return {};
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+
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+ if (!multiple_matching)
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+ return matching_element;
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+
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+ // 4. Otherwise, create a new RadioNodeList object representing a live view of the HTMLFormControlsCollection object, further filtered so that the only nodes in the
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+ // RadioNodeList object are those that have either an id attribute or a name attribute equal to name. The nodes in the RadioNodeList object must be sorted in tree
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+ // order. Return that RadioNodeList object.
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+ return JS::make_handle(RadioNodeList::create(realm(), root(), LiveNodeList::Scope::Descendants, [deprecated_name](Node const& node) {
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+ if (!is<Element>(node))
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+ return false;
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+
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+ auto const& element = verify_cast<Element>(node);
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+ return element.attribute(HTML::AttributeNames::id) == deprecated_name || element.name() == deprecated_name;
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+ }));
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+}
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+
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+}
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