Everywhere: Hoist the Libraries folder to the top-level

Author: https://github.com/trflynn89
Commit: 93712b24bf
Pull-request: https://github.com/LadybirdBrowser/ladybird/pull/2256
Reviewed-by: https://github.com/sideshowbarker

Libraries/LibWeb/DOM/NonElementParentNode.h

@@ -0,0 +1,38 @@
+/*
+ * Copyright (c) 2020, Andreas Kling <andreas@ladybird.org>
+ *
+ * SPDX-License-Identifier: BSD-2-Clause
+ */
+
+#pragma once
+
+#include <AK/FlyString.h>
+#include <AK/Forward.h>
+#include <LibJS/Heap/GCPtr.h>
+#include <LibWeb/Forward.h>
+#include <LibWeb/HTML/AttributeNames.h>
+#include <LibWeb/TreeNode.h>
+
+namespace Web::DOM {
+
+template<typename NodeType>
+class NonElementParentNode {
+public:
+    JS::GCPtr<Element> get_element_by_id(FlyString const& id) const
+    {
+        JS::GCPtr<Element> found_element;
+        const_cast<NodeType*>(static_cast<NodeType const*>(this))->template for_each_in_inclusive_subtree_of_type<Element>([&](auto& element) {
+            if (element.id() == id) {
+                found_element = &element;
+                return TraversalDecision::Break;
+            }
+            return TraversalDecision::Continue;
+        });
+        return found_element;
+    }
+
+protected:
+    NonElementParentNode() = default;
+};
+
+}