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diff --git a/dom/webidl/HTMLCanvasElement.webidl b/dom/webidl/HTMLCanvasElement.webidl
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+++ b/dom/webidl/HTMLCanvasElement.webidl
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+/* -*- 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 nsISupports;
+interface Variant;
+
+[Exposed=Window]
+interface HTMLCanvasElement : HTMLElement {
+  [HTMLConstructor] constructor();
+
+  [CEReactions, Pure, SetterThrows]
+           attribute unsigned long width;
+  [CEReactions, Pure, SetterThrows]
+           attribute unsigned long height;
+
+  [Throws]
+  nsISupports? getContext(DOMString contextId, optional any contextOptions = null);
+
+  [Throws, NeedsSubjectPrincipal]
+  DOMString toDataURL(optional DOMString type = "",
+                      optional any encoderOptions);
+  [Throws, NeedsSubjectPrincipal]
+  void toBlob(BlobCallback callback,
+              optional DOMString type = "",
+              optional any encoderOptions);
+};
+
+// Mozilla specific bits
+partial interface HTMLCanvasElement {
+  [Pure, SetterThrows]
+           attribute boolean mozOpaque;
+  [Throws, NeedsSubjectPrincipal, Pref="canvas.mozgetasfile.enabled"]
+  File mozGetAsFile(DOMString name, optional DOMString? type = null);
+  // A Mozilla-only extension to get a canvas context backed by double-buffered
+  // shared memory. Only privileged callers can call this.
+  [ChromeOnly, Throws]
+  nsISupports? MozGetIPCContext(DOMString contextId);
+
+           attribute PrintCallback? mozPrintCallback;
+
+  [Throws, Pref="canvas.capturestream.enabled", NeedsSubjectPrincipal]
+  CanvasCaptureMediaStream captureStream(optional double frameRate);
+};
+
+// For OffscreenCanvas
+// Reference: https://wiki.whatwg.org/wiki/OffscreenCanvas
+partial interface HTMLCanvasElement {
+  [Pref="gfx.offscreencanvas.enabled", Throws]
+  OffscreenCanvas transferControlToOffscreen();
+};
+
+[ChromeOnly,
+ Exposed=Window]
+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 BlobCallback = void(Blob? blob);