Node.insertBefore and Node.appendChild do not use custom binding anymore

Source/core/dom/Node.idl

 /*
  * Copyright (C) 2006, 2007, 2008, 2009 Apple Inc. All rights reserved.
  * Copyright (C) 2006 Samuel Weinig <sam.weinig@gmail.com>
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Library General Public
  * License as published by the Free Software Foundation; either
  * version 2 of the License, or (at your option) any later version.
  *
  * This library is distributed in the hope that it will be useful,
@@ skipping 31 matching lines @@
 
     readonly attribute unsigned short   nodeType;
     [PerWorldBindings] readonly attribute Node             parentNode;
     [PerWorldBindings] readonly attribute NodeList         childNodes;
     [PerWorldBindings] readonly attribute Node             firstChild;
     [PerWorldBindings] readonly attribute Node             lastChild;
     [PerWorldBindings] readonly attribute Node             previousSibling;
     [PerWorldBindings] readonly attribute Node             nextSibling;
     [PerWorldBindings] readonly attribute Document         ownerDocument;
 
-    [Custom, CustomElementCallbacks, PerWorldBindings, RaisesException] Node insertBefore(Node newChild, Node refChild);
+    [CustomElementCallbacks, PerWorldBindings, RaisesException, TypeChecking=Interface] Node insertBefore(Node newChild, Node? refChild);
     [Custom, CustomElementCallbacks, PerWorldBindings, RaisesException] Node replaceChild(Node newChild, Node oldChild);
     [Custom, CustomElementCallbacks, RaisesException] Node removeChild(Node oldChild);
-    [Custom, CustomElementCallbacks, PerWorldBindings, RaisesException] Node appendChild(Node newChild);
+    [CustomElementCallbacks, PerWorldBindings, RaisesException, TypeChecking=Interface] Node appendChild(Node newChild);
 
     [ImplementedAs=hasChildren] boolean hasChildNodes();
     [CustomElementCallbacks] Node cloneNode(optional boolean deep);
     [CustomElementCallbacks] void normalize();
 
     // Introduced in DOM Level 2:
     [MeasureAs=NodeNamespaceURI] readonly attribute DOMString? namespaceURI; // Moved to Element and Attr in DOM4.
     [MeasureAs=NodeLocalName] readonly attribute DOMString? localName; // Moved to Element and Attr in DOM4.
 
     // Introduced in DOM Level 3:
@@ skipping 16 matching lines @@
     const unsigned short      DOCUMENT_POSITION_IMPLEMENTATION_SPECIFIC = 0x20;
 
     unsigned short compareDocumentPosition(Node other);
 
     // Introduced in DOM4
     boolean contains(Node other);
 
     // IE extensions
     [PerWorldBindings] readonly attribute Element parentElement;
 };