diff --git a/content/xul/content/src/nsXULElement.cpp b/content/xul/content/src/nsXULElement.cpp
index f232c4fcff90..ce3d97090bbc 100644
--- a/content/xul/content/src/nsXULElement.cpp
+++ b/content/xul/content/src/nsXULElement.cpp
@@ -2477,7 +2477,7 @@ RDFElementImpl::SetAttribute(PRInt32 aNameSpaceID,
     }
 
     if (NS_SUCCEEDED(rv) && aNotify && ElementIsInDocument()) {
-        mDocument->AttributeChanged(NS_STATIC_CAST(nsIStyledContent*, this), aName, NS_STYLE_HINT_UNKNOWN);
+        mDocument->AttributeChanged(NS_STATIC_CAST(nsIStyledContent*, this), aNameSpaceID, aName, NS_STYLE_HINT_UNKNOWN);
     }
 
     return rv;
@@ -2699,7 +2699,7 @@ RDFElementImpl::UnsetAttribute(PRInt32 aNameSpaceID, nsIAtom* aName, PRBool aNot
       // Notify document
       if (NS_SUCCEEDED(rv) && aNotify && (nsnull != mDocument)) {
           mDocument->AttributeChanged(NS_STATIC_CAST(nsIStyledContent*, this),
-                                      aName,
+                                      aNameSpaceID, aName,
                                       NS_STYLE_HINT_UNKNOWN);
       }
     }
diff --git a/content/xul/document/src/nsXULDocument.cpp b/content/xul/document/src/nsXULDocument.cpp
index 1863140219a1..ade0575f385c 100644
--- a/content/xul/document/src/nsXULDocument.cpp
+++ b/content/xul/document/src/nsXULDocument.cpp
@@ -301,6 +301,7 @@ public:
     NS_IMETHOD ContentStatesChanged(nsIContent* aContent1, nsIContent* aContent2);
 
     NS_IMETHOD AttributeChanged(nsIContent* aChild,
+                                PRInt32 aNameSpaceID,
                                 nsIAtom* aAttribute,
                                 PRInt32 aHint); // See nsStyleConsts fot hint values
 
@@ -1700,6 +1701,7 @@ XULDocumentImpl::ContentStatesChanged(nsIContent* aContent1, nsIContent* aConten
 
 NS_IMETHODIMP 
 XULDocumentImpl::AttributeChanged(nsIContent* aElement,
+                                  PRInt32 aNameSpaceID,
                                   nsIAtom* aAttribute,
                                   PRInt32 aHint)
 {
@@ -1724,7 +1726,7 @@ XULDocumentImpl::AttributeChanged(nsIContent* aElement,
     // Now notify external observers
     for (PRInt32 i = 0; i < mObservers.Count(); i++) {
         nsIDocumentObserver*  observer = (nsIDocumentObserver*)mObservers[i];
-        observer->AttributeChanged(this, aElement, aAttribute, aHint);
+        observer->AttributeChanged(this, aElement, aNameSpaceID, aAttribute, aHint);
         if (observer != (nsIDocumentObserver*)mObservers.ElementAt(i)) {
             i--;
         }
diff --git a/rdf/content/src/nsRDFElement.cpp b/rdf/content/src/nsRDFElement.cpp
index f232c4fcff90..ce3d97090bbc 100644
--- a/rdf/content/src/nsRDFElement.cpp
+++ b/rdf/content/src/nsRDFElement.cpp
@@ -2477,7 +2477,7 @@ RDFElementImpl::SetAttribute(PRInt32 aNameSpaceID,
     }
 
     if (NS_SUCCEEDED(rv) && aNotify && ElementIsInDocument()) {
-        mDocument->AttributeChanged(NS_STATIC_CAST(nsIStyledContent*, this), aName, NS_STYLE_HINT_UNKNOWN);
+        mDocument->AttributeChanged(NS_STATIC_CAST(nsIStyledContent*, this), aNameSpaceID, aName, NS_STYLE_HINT_UNKNOWN);
     }
 
     return rv;
@@ -2699,7 +2699,7 @@ RDFElementImpl::UnsetAttribute(PRInt32 aNameSpaceID, nsIAtom* aName, PRBool aNot
       // Notify document
       if (NS_SUCCEEDED(rv) && aNotify && (nsnull != mDocument)) {
           mDocument->AttributeChanged(NS_STATIC_CAST(nsIStyledContent*, this),
-                                      aName,
+                                      aNameSpaceID, aName,
                                       NS_STYLE_HINT_UNKNOWN);
       }
     }
diff --git a/rdf/content/src/nsXULDocument.cpp b/rdf/content/src/nsXULDocument.cpp
index 1863140219a1..ade0575f385c 100644
--- a/rdf/content/src/nsXULDocument.cpp
+++ b/rdf/content/src/nsXULDocument.cpp
@@ -301,6 +301,7 @@ public:
     NS_IMETHOD ContentStatesChanged(nsIContent* aContent1, nsIContent* aContent2);
 
     NS_IMETHOD AttributeChanged(nsIContent* aChild,
+                                PRInt32 aNameSpaceID,
                                 nsIAtom* aAttribute,
                                 PRInt32 aHint); // See nsStyleConsts fot hint values
 
@@ -1700,6 +1701,7 @@ XULDocumentImpl::ContentStatesChanged(nsIContent* aContent1, nsIContent* aConten
 
 NS_IMETHODIMP 
 XULDocumentImpl::AttributeChanged(nsIContent* aElement,
+                                  PRInt32 aNameSpaceID,
                                   nsIAtom* aAttribute,
                                   PRInt32 aHint)
 {
@@ -1724,7 +1726,7 @@ XULDocumentImpl::AttributeChanged(nsIContent* aElement,
     // Now notify external observers
     for (PRInt32 i = 0; i < mObservers.Count(); i++) {
         nsIDocumentObserver*  observer = (nsIDocumentObserver*)mObservers[i];
-        observer->AttributeChanged(this, aElement, aAttribute, aHint);
+        observer->AttributeChanged(this, aElement, aNameSpaceID, aAttribute, aHint);
         if (observer != (nsIDocumentObserver*)mObservers.ElementAt(i)) {
             i--;
         }
diff --git a/rdf/content/src/nsXULElement.cpp b/rdf/content/src/nsXULElement.cpp
index f232c4fcff90..ce3d97090bbc 100644
--- a/rdf/content/src/nsXULElement.cpp
+++ b/rdf/content/src/nsXULElement.cpp
@@ -2477,7 +2477,7 @@ RDFElementImpl::SetAttribute(PRInt32 aNameSpaceID,
     }
 
     if (NS_SUCCEEDED(rv) && aNotify && ElementIsInDocument()) {
-        mDocument->AttributeChanged(NS_STATIC_CAST(nsIStyledContent*, this), aName, NS_STYLE_HINT_UNKNOWN);
+        mDocument->AttributeChanged(NS_STATIC_CAST(nsIStyledContent*, this), aNameSpaceID, aName, NS_STYLE_HINT_UNKNOWN);
     }
 
     return rv;
@@ -2699,7 +2699,7 @@ RDFElementImpl::UnsetAttribute(PRInt32 aNameSpaceID, nsIAtom* aName, PRBool aNot
       // Notify document
       if (NS_SUCCEEDED(rv) && aNotify && (nsnull != mDocument)) {
           mDocument->AttributeChanged(NS_STATIC_CAST(nsIStyledContent*, this),
-                                      aName,
+                                      aNameSpaceID, aName,
                                       NS_STYLE_HINT_UNKNOWN);
       }
     }
diff --git a/widget/src/mac/nsMenu.cpp b/widget/src/mac/nsMenu.cpp
index e370c4d27bdd..27799f55d67a 100644
--- a/widget/src/mac/nsMenu.cpp
+++ b/widget/src/mac/nsMenu.cpp
@@ -1377,6 +1377,7 @@ NS_IMETHODIMP
 nsMenu::AttributeChanged(
   nsIDocument * aDocument,
   nsIContent  * aContent,
+  PRInt32       aNameSpaceID,
   nsIAtom     * aAttribute,
   PRInt32       aHint)
 {
diff --git a/widget/src/mac/nsMenu.h b/widget/src/mac/nsMenu.h
index d5b6008c0c6b..1577dacb7378 100644
--- a/widget/src/mac/nsMenu.h
+++ b/widget/src/mac/nsMenu.h
@@ -106,6 +106,7 @@ public:
                                   nsIContent* aContent2);
   NS_IMETHOD AttributeChanged(nsIDocument *aDocument,
                               nsIContent*  aContent,
+                              PRInt32      aNameSpaceID,
                               nsIAtom*     aAttribute,
                               PRInt32      aHint);
   NS_IMETHOD ContentAppended(nsIDocument *aDocument,
diff --git a/xpfe/appshell/src/nsWebShellWindow.cpp b/xpfe/appshell/src/nsWebShellWindow.cpp
index 33f0d304cfee..d89eea84362c 100644
--- a/xpfe/appshell/src/nsWebShellWindow.cpp
+++ b/xpfe/appshell/src/nsWebShellWindow.cpp
@@ -2460,6 +2460,7 @@ nsWebShellWindow::ContentStatesChanged(nsIDocument *aDocument,
 NS_IMETHODIMP
 nsWebShellWindow::AttributeChanged(nsIDocument *aDocument,
                                    nsIContent*  aContent,
+                                   PRInt32      aNameSpaceID,
                                    nsIAtom*     aAttribute,
                                    PRInt32      aHint)
 {
diff --git a/xpfe/appshell/src/nsWebShellWindow.h b/xpfe/appshell/src/nsWebShellWindow.h
index fcef6245f551..8f48b3ce0263 100644
--- a/xpfe/appshell/src/nsWebShellWindow.h
+++ b/xpfe/appshell/src/nsWebShellWindow.h
@@ -197,6 +197,7 @@ public:
                                   nsIContent* aContent2);
   NS_IMETHOD AttributeChanged(nsIDocument *aDocument,
                               nsIContent*  aContent,
+                              PRInt32      aNameSpaceID,
                               nsIAtom*     aAttribute,
                               PRInt32      aHint);
   NS_IMETHOD ContentAppended(nsIDocument *aDocument,