diff --git a/content/xbl/public/Makefile.in b/content/xbl/public/Makefile.in
index 46d3b37b14d..cf6e7216550 100644
--- a/content/xbl/public/Makefile.in
+++ b/content/xbl/public/Makefile.in
@@ -31,6 +31,7 @@ MODULE		= layout
 EXPORTS		= \
     nsIBindingManager.h \
     nsIXBLBinding.h \
+    nsIXBLBindingAttachedHandler.h \
     nsIXBLDocumentInfo.h \
     nsIXBLService.h \
 		$(NULL)
diff --git a/content/xbl/public/Manifest b/content/xbl/public/Manifest
index ea931b547e1..39dfd5d0744 100644
--- a/content/xbl/public/Manifest
+++ b/content/xbl/public/Manifest
@@ -1,5 +1,6 @@
 nsIBindingManager.h
 nsIXBLBinding.h
+nsIXBLBindingAttachedHandler.h
 nsIXBLDocumentInfo.h
 nsIXBLService.h
 
diff --git a/content/xbl/public/makefile.win b/content/xbl/public/makefile.win
index 21ed48436d7..778a2c7a1eb 100644
--- a/content/xbl/public/makefile.win
+++ b/content/xbl/public/makefile.win
@@ -24,6 +24,7 @@ DEPTH=..\..\..
 EXPORTS =				\
     nsIBindingManager.h \
     nsIXBLBinding.h \
+    nsIXBLBindingAttachedHandler.h \
     nsIXBLDocumentInfo.h \
     nsIXBLService.h \
     $(NULL)
diff --git a/content/xbl/public/nsIBindingManager.h b/content/xbl/public/nsIBindingManager.h
index e33153fc7b5..be05bb99a25 100644
--- a/content/xbl/public/nsIBindingManager.h
+++ b/content/xbl/public/nsIBindingManager.h
@@ -37,6 +37,7 @@
 
 class nsIContent;
 class nsIXBLBinding;
+class nsIXBLBindingAttachedHandler;
 class nsIXBLDocumentInfo;
 class nsIAtom;
 class nsIStreamListener;
@@ -64,6 +65,7 @@ public:
   NS_IMETHOD LoadBindingDocument(nsIDocument* aDocument, const nsAReadableString& aURL) = 0;
 
   NS_IMETHOD AddToAttachedQueue(nsIXBLBinding* aBinding)=0;
+  NS_IMETHOD AddHandlerToAttachedQueue(nsIXBLBindingAttachedHandler* aHandler)=0;
   NS_IMETHOD ClearAttachedQueue()=0;
   NS_IMETHOD ProcessAttachedQueue()=0;
 
diff --git a/content/xbl/src/nsBindingManager.cpp b/content/xbl/src/nsBindingManager.cpp
index 4b3e86b4d13..4a2edb4daf4 100644
--- a/content/xbl/src/nsBindingManager.cpp
+++ b/content/xbl/src/nsBindingManager.cpp
@@ -49,6 +49,7 @@
 
 #include "nsIXBLBinding.h"
 #include "nsIXBLDocumentInfo.h"
+#include "nsIXBLBindingAttachedHandler.h"
 
 #include "nsIStyleSheet.h"
 #include "nsIHTMLStyleSheet.h"
@@ -168,6 +169,7 @@ public:
   NS_IMETHOD LoadBindingDocument(nsIDocument* aBoundDoc, const nsAReadableString& aURL);
 
   NS_IMETHOD AddToAttachedQueue(nsIXBLBinding* aBinding);
+  NS_IMETHOD AddHandlerToAttachedQueue(nsIXBLBindingAttachedHandler* aHandler);
   NS_IMETHOD ClearAttachedQueue();
   NS_IMETHOD ProcessAttachedQueue();
 
@@ -400,6 +402,17 @@ nsBindingManager::AddToAttachedQueue(nsIXBLBinding* aBinding)
   return NS_OK;
 }
 
+NS_IMETHODIMP
+nsBindingManager::AddHandlerToAttachedQueue(nsIXBLBindingAttachedHandler* aBinding)
+{
+  if (!mAttachedQueue)
+    NS_NewISupportsArray(getter_AddRefs(mAttachedQueue)); // This call addrefs the array.
+
+  mAttachedQueue->AppendElement(aBinding);
+
+  return NS_OK;
+}
+
 NS_IMETHODIMP
 nsBindingManager::ClearAttachedQueue()
 {
@@ -417,10 +430,18 @@ nsBindingManager::ProcessAttachedQueue()
   PRUint32 count;
   mAttachedQueue->Count(&count);
   for (PRUint32 i = 0; i < count; i++) {
-    nsCOMPtr<nsIXBLBinding> binding;
-    mAttachedQueue->GetElementAt(0, getter_AddRefs(binding));
+    nsCOMPtr<nsISupports> supp;
+    mAttachedQueue->GetElementAt(0, getter_AddRefs(supp));
     mAttachedQueue->RemoveElementAt(0);
-    binding->ExecuteAttachedHandler();
+
+    nsCOMPtr<nsIXBLBinding> binding(do_QueryInterface(supp));
+    if (binding)
+      binding->ExecuteAttachedHandler();
+    else {
+      nsCOMPtr<nsIXBLBindingAttachedHandler> handler(do_QueryInterface(supp));
+      if (handler)
+        handler->OnBindingAttached();
+    }
   }
 
   ClearAttachedQueue();
diff --git a/content/xbl/src/nsXBLBinding.cpp b/content/xbl/src/nsXBLBinding.cpp
index fd97dc32824..1cc5d8fdcab 100644
--- a/content/xbl/src/nsXBLBinding.cpp
+++ b/content/xbl/src/nsXBLBinding.cpp
@@ -1201,7 +1201,11 @@ nsXBLBinding::GetID(nsCString& aResult)
 NS_IMETHODIMP
 nsXBLBinding::InheritsStyle(PRBool* aResult)
 {
-  *aResult = mInheritStyle;
+  if (mContent)
+    *aResult = mInheritStyle;
+  else if (mNextBinding)
+    return mNextBinding->InheritsStyle(aResult);
+
   return NS_OK;
 }
 
diff --git a/layout/xbl/public/Makefile.in b/layout/xbl/public/Makefile.in
index 46d3b37b14d..cf6e7216550 100644
--- a/layout/xbl/public/Makefile.in
+++ b/layout/xbl/public/Makefile.in
@@ -31,6 +31,7 @@ MODULE		= layout
 EXPORTS		= \
     nsIBindingManager.h \
     nsIXBLBinding.h \
+    nsIXBLBindingAttachedHandler.h \
     nsIXBLDocumentInfo.h \
     nsIXBLService.h \
 		$(NULL)
diff --git a/layout/xbl/public/Manifest b/layout/xbl/public/Manifest
index ea931b547e1..39dfd5d0744 100644
--- a/layout/xbl/public/Manifest
+++ b/layout/xbl/public/Manifest
@@ -1,5 +1,6 @@
 nsIBindingManager.h
 nsIXBLBinding.h
+nsIXBLBindingAttachedHandler.h
 nsIXBLDocumentInfo.h
 nsIXBLService.h
 
diff --git a/layout/xbl/public/makefile.win b/layout/xbl/public/makefile.win
index 21ed48436d7..778a2c7a1eb 100644
--- a/layout/xbl/public/makefile.win
+++ b/layout/xbl/public/makefile.win
@@ -24,6 +24,7 @@ DEPTH=..\..\..
 EXPORTS =				\
     nsIBindingManager.h \
     nsIXBLBinding.h \
+    nsIXBLBindingAttachedHandler.h \
     nsIXBLDocumentInfo.h \
     nsIXBLService.h \
     $(NULL)
diff --git a/layout/xbl/public/nsIBindingManager.h b/layout/xbl/public/nsIBindingManager.h
index e33153fc7b5..be05bb99a25 100644
--- a/layout/xbl/public/nsIBindingManager.h
+++ b/layout/xbl/public/nsIBindingManager.h
@@ -37,6 +37,7 @@
 
 class nsIContent;
 class nsIXBLBinding;
+class nsIXBLBindingAttachedHandler;
 class nsIXBLDocumentInfo;
 class nsIAtom;
 class nsIStreamListener;
@@ -64,6 +65,7 @@ public:
   NS_IMETHOD LoadBindingDocument(nsIDocument* aDocument, const nsAReadableString& aURL) = 0;
 
   NS_IMETHOD AddToAttachedQueue(nsIXBLBinding* aBinding)=0;
+  NS_IMETHOD AddHandlerToAttachedQueue(nsIXBLBindingAttachedHandler* aHandler)=0;
   NS_IMETHOD ClearAttachedQueue()=0;
   NS_IMETHOD ProcessAttachedQueue()=0;
 
diff --git a/layout/xbl/src/nsBindingManager.cpp b/layout/xbl/src/nsBindingManager.cpp
index 4b3e86b4d13..4a2edb4daf4 100644
--- a/layout/xbl/src/nsBindingManager.cpp
+++ b/layout/xbl/src/nsBindingManager.cpp
@@ -49,6 +49,7 @@
 
 #include "nsIXBLBinding.h"
 #include "nsIXBLDocumentInfo.h"
+#include "nsIXBLBindingAttachedHandler.h"
 
 #include "nsIStyleSheet.h"
 #include "nsIHTMLStyleSheet.h"
@@ -168,6 +169,7 @@ public:
   NS_IMETHOD LoadBindingDocument(nsIDocument* aBoundDoc, const nsAReadableString& aURL);
 
   NS_IMETHOD AddToAttachedQueue(nsIXBLBinding* aBinding);
+  NS_IMETHOD AddHandlerToAttachedQueue(nsIXBLBindingAttachedHandler* aHandler);
   NS_IMETHOD ClearAttachedQueue();
   NS_IMETHOD ProcessAttachedQueue();
 
@@ -400,6 +402,17 @@ nsBindingManager::AddToAttachedQueue(nsIXBLBinding* aBinding)
   return NS_OK;
 }
 
+NS_IMETHODIMP
+nsBindingManager::AddHandlerToAttachedQueue(nsIXBLBindingAttachedHandler* aBinding)
+{
+  if (!mAttachedQueue)
+    NS_NewISupportsArray(getter_AddRefs(mAttachedQueue)); // This call addrefs the array.
+
+  mAttachedQueue->AppendElement(aBinding);
+
+  return NS_OK;
+}
+
 NS_IMETHODIMP
 nsBindingManager::ClearAttachedQueue()
 {
@@ -417,10 +430,18 @@ nsBindingManager::ProcessAttachedQueue()
   PRUint32 count;
   mAttachedQueue->Count(&count);
   for (PRUint32 i = 0; i < count; i++) {
-    nsCOMPtr<nsIXBLBinding> binding;
-    mAttachedQueue->GetElementAt(0, getter_AddRefs(binding));
+    nsCOMPtr<nsISupports> supp;
+    mAttachedQueue->GetElementAt(0, getter_AddRefs(supp));
     mAttachedQueue->RemoveElementAt(0);
-    binding->ExecuteAttachedHandler();
+
+    nsCOMPtr<nsIXBLBinding> binding(do_QueryInterface(supp));
+    if (binding)
+      binding->ExecuteAttachedHandler();
+    else {
+      nsCOMPtr<nsIXBLBindingAttachedHandler> handler(do_QueryInterface(supp));
+      if (handler)
+        handler->OnBindingAttached();
+    }
   }
 
   ClearAttachedQueue();
diff --git a/layout/xbl/src/nsXBLBinding.cpp b/layout/xbl/src/nsXBLBinding.cpp
index fd97dc32824..1cc5d8fdcab 100644
--- a/layout/xbl/src/nsXBLBinding.cpp
+++ b/layout/xbl/src/nsXBLBinding.cpp
@@ -1201,7 +1201,11 @@ nsXBLBinding::GetID(nsCString& aResult)
 NS_IMETHODIMP
 nsXBLBinding::InheritsStyle(PRBool* aResult)
 {
-  *aResult = mInheritStyle;
+  if (mContent)
+    *aResult = mInheritStyle;
+  else if (mNextBinding)
+    return mNextBinding->InheritsStyle(aResult);
+
   return NS_OK;
 }