diff -r 000000000000 -r 6474c204b198 dom/webidl/HTMLCanvasElement.webidl
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/dom/webidl/HTMLCanvasElement.webidl	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,61 @@
+/* -*- Mode: IDL; 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/.
+ *
+ * The origin of this IDL file is
+ * http://www.whatwg.org/specs/web-apps/current-work/#the-canvas-element
+ * © Copyright 2004-2011 Apple Computer, Inc., Mozilla Foundation, and
+ * Opera Software ASA. You are granted a license to use, reproduce
+ * and create derivative works of this document.
+ */
+
+interface Blob;
+interface nsIInputStreamCallback;
+interface nsISupports;
+interface Variant;
+
+interface HTMLCanvasElement : HTMLElement {
+  [Pure, SetterThrows]
+           attribute unsigned long width;
+  [Pure, SetterThrows]
+           attribute unsigned long height;
+
+  [Throws]
+  nsISupports? getContext(DOMString contextId, optional any contextOptions = null);
+
+  [Throws]
+  DOMString toDataURL(optional DOMString type = "",
+                      optional any encoderOptions);
+  [Throws]
+  void toBlob(FileCallback _callback,
+              optional DOMString type = "",
+              optional any encoderOptions);
+};
+
+// Mozilla specific bits
+partial interface HTMLCanvasElement {
+  [Pure, SetterThrows]
+           attribute boolean mozOpaque;
+  [Throws]
+  File mozGetAsFile(DOMString name, optional DOMString? type = null);
+  [ChromeOnly, Throws]
+  nsISupports? MozGetIPCContext(DOMString contextId);
+  [ChromeOnly]
+  void mozFetchAsStream(nsIInputStreamCallback callback, optional DOMString? type = null);
+           attribute PrintCallback? mozPrintCallback;
+};
+
+[ChromeOnly]
+interface MozCanvasPrintState
+{
+  // A canvas rendering context.
+  readonly attribute nsISupports context;
+
+  // To be called when rendering to the context is done.
+  void done();
+};
+
+callback PrintCallback = void(MozCanvasPrintState ctx);
+
+callback FileCallback = void(Blob file);