diff -r 000000000000 -r 6474c204b198 layout/style/CSS.h
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/layout/style/CSS.h	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,45 @@
+/* -*- 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/. */
+
+/* DOM object holding utility CSS functions */
+
+#ifndef mozilla_dom_CSS_h_
+#define mozilla_dom_CSS_h_
+
+#include "mozilla/Attributes.h"
+#include "mozilla/Preferences.h"
+
+namespace mozilla {
+
+class ErrorResult;
+
+namespace dom {
+
+class GlobalObject;
+
+class CSS {
+private:
+  CSS() MOZ_DELETE;
+
+public:
+  static bool Supports(const GlobalObject& aGlobal,
+                       const nsAString& aProperty,
+                       const nsAString& aValue,
+                       ErrorResult& aRv);
+
+  static bool Supports(const GlobalObject& aGlobal,
+                       const nsAString& aDeclaration,
+                       ErrorResult& aRv);
+
+  static void Escape(const GlobalObject& aGlobal,
+                     const nsAString& aIdent,
+                     nsAString& aReturn,
+                     ErrorResult& aRv);
+};
+
+} // namespace dom
+} // namespace mozilla
+
+#endif // mozilla_dom_CSS_h_