LibWeb: Implement RadioNodeList

This interface is used in the interface for HTMLFormControlsCollection
as a live view over its matching elements.

Currently the "value" attribute for this interface is left
unimplemented.

Userland/Libraries/LibWeb/DOM/RadioNodeList.cpp

@@ -0,0 +1,32 @@
+/*
+ * Copyright (c) 2023, Shannon Booth <shannon@serenityos.org>
+ *
+ * SPDX-License-Identifier: BSD-2-Clause
+ */
+
+#include <LibWeb/Bindings/Intrinsics.h>
+#include <LibWeb/Bindings/RadioNodeListPrototype.h>
+#include <LibWeb/DOM/Element.h>
+#include <LibWeb/DOM/RadioNodeList.h>
+
+namespace Web::DOM {
+
+JS::NonnullGCPtr<RadioNodeList> RadioNodeList::create(JS::Realm& realm, Node& root, Scope scope, Function<bool(Node const&)> filter)
+{
+    return realm.heap().allocate<RadioNodeList>(realm, realm, root, scope, move(filter));
+}
+
+RadioNodeList::RadioNodeList(JS::Realm& realm, Node& root, Scope scope, Function<bool(Node const&)> filter)
+    : LiveNodeList(realm, root, scope, move(filter))
+{
+}
+
+RadioNodeList::~RadioNodeList() = default;
+
+void RadioNodeList::initialize(JS::Realm& realm)
+{
+    Base::initialize(realm);
+    set_prototype(&Bindings::ensure_web_prototype<Bindings::RadioNodeListPrototype>(realm, "RadioNodeList"));
+}
+
+}

Userland/Libraries/LibWeb/DOM/RadioNodeList.h

@@ -0,0 +1,29 @@
+/*
+ * Copyright (c) 2023, Shannon Booth <shannon@serenityos.org>
+ *
+ * SPDX-License-Identifier: BSD-2-Clause
+ */
+
+#pragma once
+
+#include <LibWeb/DOM/LiveNodeList.h>
+
+namespace Web::DOM {
+
+// https://html.spec.whatwg.org/multipage/common-dom-interfaces.html#radionodelist
+class RadioNodeList : public LiveNodeList {
+    WEB_PLATFORM_OBJECT(RadioNodeList, LiveNodeList);
+
+public:
+    [[nodiscard]] static JS::NonnullGCPtr<RadioNodeList> create(JS::Realm& realm, Node& root, Scope scope, Function<bool(Node const&)> filter);
+
+    virtual ~RadioNodeList() override;
+
+protected:
+    virtual void initialize(JS::Realm&) override;
+
+private:
+    explicit RadioNodeList(JS::Realm& realm, Node& root, Scope scope, Function<bool(Node const&)> filter);
+};
+
+}

Userland/Libraries/LibWeb/DOM/RadioNodeList.idl

@@ -0,0 +1,7 @@
+#import <DOM/NodeList.idl>
+
+// https://html.spec.whatwg.org/multipage/common-dom-interfaces.html#radionodelist
+[Exposed=Window, UseNewAKString]
+interface RadioNodeList : NodeList {
+    // FIXME: attribute DOMString value;
+};