diff --git a/dom/macbuild/dom_coreIDL.xml b/dom/macbuild/dom_coreIDL.xml
index f0be13b04296..76b5352b82e7 100644
--- a/dom/macbuild/dom_coreIDL.xml
+++ b/dom/macbuild/dom_coreIDL.xml
@@ -850,6 +850,13 @@
                     <FILEKIND>Text</FILEKIND>
                     <FILEFLAGS></FILEFLAGS>
                 </FILE>
+                <FILE>
+                    <PATHTYPE>Name</PATHTYPE>
+                    <PATH>nsIDOM3Node.idl</PATH>
+                    <PATHFORMAT>MacOS</PATHFORMAT>
+                    <FILEKIND>Text</FILEKIND>
+                    <FILEFLAGS></FILEFLAGS>
+                </FILE>
             </FILELIST>
             <LINKORDER>
                 <FILEREF>
@@ -952,6 +959,11 @@
                     <PATH>nsIDOMXMLDocument.idl</PATH>
                     <PATHFORMAT>MacOS</PATHFORMAT>
                 </FILEREF>
+                <FILEREF>
+                    <PATHTYPE>Name</PATHTYPE>
+                    <PATH>nsIDOM3Node.idl</PATH>
+                    <PATHFORMAT>MacOS</PATHFORMAT>
+                </FILEREF>
             </LINKORDER>
         </TARGET>
         <TARGET>
@@ -1751,6 +1763,13 @@
                     <FILEKIND>Text</FILEKIND>
                     <FILEFLAGS></FILEFLAGS>
                 </FILE>
+                <FILE>
+                    <PATHTYPE>Name</PATHTYPE>
+                    <PATH>nsIDOM3Node.idl</PATH>
+                    <PATHFORMAT>MacOS</PATHFORMAT>
+                    <FILEKIND>Text</FILEKIND>
+                    <FILEFLAGS></FILEFLAGS>
+                </FILE>
             </FILELIST>
             <LINKORDER>
                 <FILEREF>
@@ -1853,6 +1872,11 @@
                     <PATH>nsIDOMXMLDocument.idl</PATH>
                     <PATHFORMAT>MacOS</PATHFORMAT>
                 </FILEREF>
+                <FILEREF>
+                    <PATHTYPE>Name</PATHTYPE>
+                    <PATH>nsIDOM3Node.idl</PATH>
+                    <PATHFORMAT>MacOS</PATHFORMAT>
+                </FILEREF>
             </LINKORDER>
         </TARGET>
     </TARGETLIST>
@@ -1863,6 +1887,12 @@
     </TARGETORDER>
 
     <GROUPLIST>
+        <FILEREF>
+            <TARGETNAME>headers</TARGETNAME>
+            <PATHTYPE>Name</PATHTYPE>
+            <PATH>nsIDOM3Node.idl</PATH>
+            <PATHFORMAT>MacOS</PATHFORMAT>
+        </FILEREF>
         <FILEREF>
             <TARGETNAME>headers</TARGETNAME>
             <PATHTYPE>Name</PATHTYPE>
diff --git a/dom/public/idl/core/MANIFEST_IDL b/dom/public/idl/core/MANIFEST_IDL
index d70fc4a3a177..1ecd139344cd 100644
--- a/dom/public/idl/core/MANIFEST_IDL
+++ b/dom/public/idl/core/MANIFEST_IDL
@@ -12,6 +12,7 @@ nsIDOMEntity.idl
 nsIDOMEntityReference.idl
 nsIDOMNamedNodeMap.idl
 nsIDOMNode.idl
+nsIDOM3Node.idl
 nsIDOMNodeList.idl
 nsIDOMNotation.idl
 nsIDOMNSDocument.idl
diff --git a/dom/public/idl/core/Makefile.in b/dom/public/idl/core/Makefile.in
index 3fac7f1b8381..49582a8c025f 100644
--- a/dom/public/idl/core/Makefile.in
+++ b/dom/public/idl/core/Makefile.in
@@ -45,6 +45,7 @@ XPIDLSRCS =                                     \
 	nsIDOMNSDocument.idl			\
 	nsIDOMNamedNodeMap.idl			\
 	nsIDOMNode.idl				\
+	nsIDOM3Node.idl				\
 	nsIDOMNodeList.idl			\
 	nsIDOMNotation.idl			\
 	nsIDOMProcessingInstruction.idl		\
diff --git a/dom/public/idl/core/makefile.win b/dom/public/idl/core/makefile.win
index b5b8de028f16..0b898f7a632a 100755
--- a/dom/public/idl/core/makefile.win
+++ b/dom/public/idl/core/makefile.win
@@ -40,6 +40,7 @@ XPIDLSRCS =					\
 	.\nsIDOMNSDocument.idl			\
 	.\nsIDOMNamedNodeMap.idl		\
 	.\nsIDOMNode.idl			\
+	.\nsIDOM3Node.idl			\
 	.\nsIDOMNodeList.idl			\
 	.\nsIDOMNotation.idl			\
 	.\nsIDOMProcessingInstruction.idl	\
diff --git a/dom/public/idl/core/nsIDOMNode.idl b/dom/public/idl/core/nsIDOMNode.idl
index b6b42a1ad8c7..68f05cfe8b90 100644
--- a/dom/public/idl/core/nsIDOMNode.idl
+++ b/dom/public/idl/core/nsIDOMNode.idl
@@ -39,6 +39,7 @@
  * ***** END LICENSE BLOCK ***** */
 
 #include "domstubs.idl"
+#include "nsIDOM3Node.idl"
 
 /**
  * The nsIDOMNode interface is the primary datatype for the entire 
@@ -109,15 +110,3 @@ interface nsIDOMNode : nsISupports
   // Introduced in DOM Level 2:
   boolean            hasAttributes();
 };
-
-
-[scriptable, uuid(29fb2a18-1dd2-11b2-8dd9-a6fd5d5ad12f)]
-interface nsIDOM3Node : nsISupports
-{
-  // Introduced in DOM Level 3:
-  readonly attribute DOMString        baseURI;
- // Introduced in DOM Level 3:
-  DOMString          lookupNamespacePrefix(in DOMString namespaceURI);
-  // Introduced in DOM Level 3:
-  DOMString          lookupNamespaceURI(in DOMString prefix);
-};