diff -r 000000000000 -r 6474c204b198 layout/base/nsCompatibility.h
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/layout/base/nsCompatibility.h	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,17 @@
+/* -*- 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/. */
+
+/* constants for quirks mode, standards mode, and almost standards mode */
+
+#ifndef nsCompatibility_h___
+#define nsCompatibility_h___
+
+enum nsCompatibility {
+  eCompatibility_FullStandards   = 1,
+  eCompatibility_AlmostStandards = 2,
+  eCompatibility_NavQuirks       = 3
+};
+
+#endif /* nsCompatibility_h___ */