diff -r 000000000000 -r 6474c204b198 layout/style/nsDOMCSSAttrDeclaration.h
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/layout/style/nsDOMCSSAttrDeclaration.h	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,57 @@
+/* -*- 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 for element.style */
+
+#ifndef nsDOMCSSAttributeDeclaration_h
+#define nsDOMCSSAttributeDeclaration_h
+
+#include "mozilla/Attributes.h"
+#include "nsDOMCSSDeclaration.h"
+
+#include "nsAutoPtr.h"
+
+namespace mozilla {
+namespace dom {
+class Element;
+}
+}
+
+class nsDOMCSSAttributeDeclaration MOZ_FINAL : public nsDOMCSSDeclaration
+{
+public:
+  typedef mozilla::dom::Element Element;
+  nsDOMCSSAttributeDeclaration(Element* aContent, bool aIsSMILOverride);
+  ~nsDOMCSSAttributeDeclaration();
+
+  NS_DECL_CYCLE_COLLECTING_ISUPPORTS
+  NS_DECL_CYCLE_COLLECTION_SKIPPABLE_SCRIPT_HOLDER_CLASS_AMBIGUOUS(nsDOMCSSAttributeDeclaration,
+                                                                   nsICSSDeclaration)
+
+  // If GetCSSDeclaration returns non-null, then the decl it returns
+  // is owned by our current style rule.
+  virtual mozilla::css::Declaration* GetCSSDeclaration(bool aAllocate);
+  virtual void GetCSSParsingEnvironment(CSSParsingEnvironment& aCSSParseEnv) MOZ_OVERRIDE;
+  NS_IMETHOD GetParentRule(nsIDOMCSSRule **aParent) MOZ_OVERRIDE;
+
+  virtual nsINode* GetParentObject() MOZ_OVERRIDE;
+
+  NS_IMETHOD SetPropertyValue(const nsCSSProperty aPropID,
+                              const nsAString& aValue) MOZ_OVERRIDE;
+
+protected:
+  virtual nsresult SetCSSDeclaration(mozilla::css::Declaration* aDecl) MOZ_OVERRIDE;
+  virtual nsIDocument* DocToUpdate() MOZ_OVERRIDE;
+
+  nsRefPtr<Element> mElement;
+
+  /* If true, this indicates that this nsDOMCSSAttributeDeclaration
+   * should interact with mContent's SMIL override style rule (rather
+   * than the inline style rule).
+   */
+  const bool mIsSMILOverride;
+};
+
+#endif /* nsDOMCSSAttributeDeclaration_h */