From a0528598b56383d1c8a7db7d1cc4d6365dd87259 Mon Sep 17 00:00:00 2001
From: Andreas Kling <kling@serenityos.org>
Date: Mon, 13 Sep 2021 12:49:23 +0200
Subject: [PATCH] LibWeb: Implement Node.isSameNode(Node? otherNode)

---
 Userland/Libraries/LibWeb/DOM/Node.cpp | 6 ++++++
 Userland/Libraries/LibWeb/DOM/Node.h   | 2 ++
 Userland/Libraries/LibWeb/DOM/Node.idl | 1 +
 3 files changed, 9 insertions(+)

diff --git a/Userland/Libraries/LibWeb/DOM/Node.cpp b/Userland/Libraries/LibWeb/DOM/Node.cpp
index db2fcc2233..2730a47223 100644
--- a/Userland/Libraries/LibWeb/DOM/Node.cpp
+++ b/Userland/Libraries/LibWeb/DOM/Node.cpp
@@ -768,4 +768,10 @@ void Node::string_replace_all(String const& string)
     replace_all(node);
 }
 
+// https://dom.spec.whatwg.org/#dom-node-issamenode
+bool Node::is_same_node(Node const* other_node) const
+{
+    return this == other_node;
+}
+
 }
diff --git a/Userland/Libraries/LibWeb/DOM/Node.h b/Userland/Libraries/LibWeb/DOM/Node.h
index 9287a97430..eb2f6747f1 100644
--- a/Userland/Libraries/LibWeb/DOM/Node.h
+++ b/Userland/Libraries/LibWeb/DOM/Node.h
@@ -186,6 +186,8 @@ public:
     void replace_all(RefPtr<Node>);
     void string_replace_all(String const&);
 
+    bool is_same_node(Node const*) const;
+
 protected:
     Node(Document&, NodeType);
 
diff --git a/Userland/Libraries/LibWeb/DOM/Node.idl b/Userland/Libraries/LibWeb/DOM/Node.idl
index 603095e5ed..419793432f 100644
--- a/Userland/Libraries/LibWeb/DOM/Node.idl
+++ b/Userland/Libraries/LibWeb/DOM/Node.idl
@@ -26,6 +26,7 @@ interface Node : EventTarget {
     [ImplementedAs=pre_remove] Node removeChild(Node child);
     [ImplementedAs=clone_node_binding] Node cloneNode(optional boolean deep = false);
     boolean contains(Node? other);
+    boolean isSameNode(Node? otherNode);
 
     const unsigned short ELEMENT_NODE = 1;
     const unsigned short ATTRIBUTE_NODE = 2;