diff -r 000000000000 -r 6474c204b198 content/base/public/nsINodeList.h
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/content/base/public/nsINodeList.h	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,60 @@
+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * 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/. */
+
+#ifndef nsINodeList_h___
+#define nsINodeList_h___
+
+#include "nsIDOMNodeList.h"
+#include "nsWrapperCache.h"
+#include "nsIContent.h"
+
+// IID for the nsINodeList interface
+#define NS_INODELIST_IID \
+{ 0xadb5e54c, 0x6e96, 0x4102, \
+ { 0x8d, 0x40, 0xe0, 0x12, 0x3d, 0xcf, 0x48, 0x7a } }
+
+/**
+ * An internal interface for a reasonably fast indexOf.
+ */
+class nsINodeList : public nsIDOMNodeList,
+                    public nsWrapperCache
+{
+public:
+  NS_DECLARE_STATIC_IID_ACCESSOR(NS_INODELIST_IID)
+
+  /**
+   * Get the index of the given node in the list.  Will return -1 if the node
+   * is not in the list.
+   */
+  virtual int32_t IndexOf(nsIContent* aContent) = 0;
+
+  /**
+   * Get the root node for this nodelist.
+   */
+  virtual nsINode* GetParentObject() = 0;
+
+  using nsIDOMNodeList::Item;
+
+  uint32_t Length()
+  {
+    uint32_t length;
+    GetLength(&length);
+    return length;
+  }
+  virtual nsIContent* Item(uint32_t aIndex) = 0;
+  nsIContent* IndexedGetter(uint32_t aIndex, bool& aFound)
+  {
+    nsIContent* item = Item(aIndex);
+    aFound = !!item;
+    return item;
+  }
+};
+
+#define NS_NODELIST_OFFSET_AND_INTERFACE_TABLE_BEGIN(_class)                  \
+  NS_OFFSET_AND_INTERFACE_TABLE_BEGIN_AMBIGUOUS(_class, nsINodeList)
+
+NS_DEFINE_STATIC_IID_ACCESSOR(nsINodeList, NS_INODELIST_IID)
+
+#endif /* nsINodeList_h___ */