2 files changed, 24 insertions, 0 deletions
diff --git a/dom/html/HTMLSlotElement.cpp b/dom/html/HTMLSlotElement.cpp
index b13729a09..18b8ef87b 100644
--- a/dom/html/HTMLSlotElement.cpp
+++ b/dom/html/HTMLSlotElement.cpp
@@ -4,6 +4,7 @@
  * License, v. 2.0. If a copy of the MPL was not distributed with this
  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
 
+#include "mozilla/dom/DocGroup.h"
 #include "mozilla/dom/HTMLSlotElement.h"
 #include "mozilla/dom/HTMLSlotElementBinding.h"
 #include "mozilla/dom/HTMLUnknownElement.h"
@@ -204,6 +205,26 @@ HTMLSlotElement::ClearAssignedNodes()
   mAssignedNodes.Clear();
 }
 
+void
+HTMLSlotElement::EnqueueSlotChangeEvent() const
+{
+  DocGroup* docGroup = OwnerDoc()->GetDocGroup();
+  if (!docGroup) {
+    return;
+  }
+
+  docGroup->SignalSlotChange(this);
+}
+
+void
+HTMLSlotElement::FireSlotChangeEvent()
+{
+  nsContentUtils::DispatchTrustedEvent(OwnerDoc(),
+                                       static_cast<nsIContent*>(this),
+                                       NS_LITERAL_STRING("slotchange"), true,
+                                       false);
+}
+
 JSObject*
 HTMLSlotElement::WrapNode(JSContext* aCx, JS::Handle<JSObject*> aGivenProto)
 {
diff --git a/dom/html/HTMLSlotElement.h b/dom/html/HTMLSlotElement.h
index 4f8546200..0494a654e 100644
--- a/dom/html/HTMLSlotElement.h
+++ b/dom/html/HTMLSlotElement.h
@@ -62,6 +62,9 @@ public:
   void RemoveAssignedNode(nsINode* aNode);
   void ClearAssignedNodes();
 
+  void EnqueueSlotChangeEvent() const;
+  void FireSlotChangeEvent();
+
 protected:
   virtual ~HTMLSlotElement();
   virtual JSObject*