diff -r 000000000000 -r 6474c204b198 content/base/src/nsDOMTokenList.h
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/content/base/src/nsDOMTokenList.h	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,84 @@
+/* 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/. */
+
+/*
+ * Implementation of DOMTokenList specified by HTML5.
+ */
+
+#ifndef nsDOMTokenList_h___
+#define nsDOMTokenList_h___
+
+#include "nsCOMPtr.h"
+#include "nsDOMString.h"
+#include "nsWrapperCache.h"
+#include "mozilla/dom/Element.h"
+#include "mozilla/dom/BindingDeclarations.h"
+
+namespace mozilla {
+class ErrorResult;
+
+} // namespace mozilla
+
+class nsAttrValue;
+class nsIAtom;
+
+// nsISupports must be on the primary inheritance chain
+// because nsDOMSettableTokenList is traversed by Element.
+class nsDOMTokenList : public nsISupports,
+                       public nsWrapperCache
+{
+protected:
+  typedef mozilla::dom::Element Element;
+
+public:
+  NS_DECL_CYCLE_COLLECTING_ISUPPORTS
+  NS_DECL_CYCLE_COLLECTION_SCRIPT_HOLDER_CLASS(nsDOMTokenList)
+
+  nsDOMTokenList(Element* aElement, nsIAtom* aAttrAtom);
+
+  virtual JSObject* WrapObject(JSContext *cx) MOZ_OVERRIDE;
+
+  Element* GetParentObject()
+  {
+    return mElement;
+  }
+
+  uint32_t Length();
+  void Item(uint32_t aIndex, nsAString& aResult)
+  {
+    bool found;
+    IndexedGetter(aIndex, found, aResult);
+    if (!found) {
+      SetDOMStringToNull(aResult);
+    }
+  }
+  void IndexedGetter(uint32_t aIndex, bool& aFound, nsAString& aResult);
+  bool Contains(const nsAString& aToken, mozilla::ErrorResult& aError);
+  void Add(const nsAString& aToken, mozilla::ErrorResult& aError);
+  void Add(const nsTArray<nsString>& aTokens,
+           mozilla::ErrorResult& aError);
+  void Remove(const nsAString& aToken, mozilla::ErrorResult& aError);
+  void Remove(const nsTArray<nsString>& aTokens,
+              mozilla::ErrorResult& aError);
+  bool Toggle(const nsAString& aToken,
+              const mozilla::dom::Optional<bool>& force,
+              mozilla::ErrorResult& aError);
+  void Stringify(nsAString& aResult);
+
+protected:
+  virtual ~nsDOMTokenList();
+
+  nsresult CheckToken(const nsAString& aStr);
+  nsresult CheckTokens(const nsTArray<nsString>& aStr);
+  void AddInternal(const nsAttrValue* aAttr,
+                   const nsTArray<nsString>& aTokens);
+  void RemoveInternal(const nsAttrValue* aAttr,
+                      const nsTArray<nsString>& aTokens);
+  inline const nsAttrValue* GetParsedAttr();
+
+  nsCOMPtr<Element> mElement;
+  nsCOMPtr<nsIAtom> mAttrAtom;
+};
+
+#endif // nsDOMTokenList_h___