Adding interface file, not part of the build.

dom/public/idl/html/nsIDOMNSHTMLOptionCollectn.idl

@@ -0,0 +1,35 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*-
+ *
+ * The contents of this file are subject to the Mozilla Public
+ * License Version 1.1 (the "License"); you may not use this file
+ * except in compliance with the License. You may obtain a copy of
+ * the License at http://www.mozilla.org/MPL/
+ * 
+ * Software distributed under the License is distributed on an "AS
+ * IS" basis, WITHOUT WARRANTY OF ANY KIND, either express or
+ * implied. See the License for the specific language governing
+ * rights and limitations under the License.
+ * 
+ * The Original Code is the Mozilla browser.
+ * 
+ * The Initial Developer of the Original Code is Netscape
+ * Communications, Inc.  Portions created by Netscape are
+ * Copyright (C) 1999, Mozilla.  All Rights Reserved.
+ * 
+ * Contributor(s):
+ */
+
+#include "domstubs.idl"
+
+interface nsIDOMHTMLOptionElement;
+
+
+[scriptable, uuid(a6cf9114-15b3-11d2-932e-00805f8add32)]
+interface nsIDOMNSHTMLOptionCollection : nsISupports
+{
+           attribute unsigned long    length;
+           attribute long             selectedIndex;
+
+  [noscript] void           setOption(in long index,
+                                      in nsIDOMHTMLOptionElement option);
+};