diff --git a/components/script/dom/webidls/NamedNodeMap.webidl b/components/script/dom/webidls/NamedNodeMap.webidl
index 636c4a2782f..9279af57de5 100644
--- a/components/script/dom/webidls/NamedNodeMap.webidl
+++ b/components/script/dom/webidls/NamedNodeMap.webidl
@@ -5,4 +5,14 @@
 interface NamedNodeMap {
   readonly attribute unsigned long length;
   getter Attr? item(unsigned long index);
+  //getter Attr? getNamedItem(DOMString name);
+  //Attr? getNamedItemNS(DOMString? namespace, DOMString localName);
+  //[Throws]
+  //Attr? setNamedItem(Attr attr);
+  //[Throws]
+  //Attr? setNamedItemNS(Attr attr);
+  //[Throws]
+  //Attr removeNamedItem(DOMString name);
+  //[Throws]
+  //Attr removeNamedItemNS(DOMString? namespace, DOMString name);
 };