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diff --git a/dom/webidl/FileReader.webidl b/dom/webidl/FileReader.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
+ * https://w3c.github.io/FileAPI/#APIASynch
+ *
+ * Copyright © 2013 W3C® (MIT, ERCIM, Keio, Beihang), All Rights Reserved. W3C
+ * liability, trademark and document use rules apply.
+ */
+
+[Exposed=(Window,Worker)]
+interface FileReader : EventTarget {
+  constructor();
+
+  // async read methods
+  [Throws]
+  undefined readAsArrayBuffer(Blob blob);
+  [Throws]
+  undefined readAsBinaryString(Blob filedata);
+  [Throws]
+  undefined readAsText(Blob blob, optional DOMString label);
+  [Throws]
+  undefined readAsDataURL(Blob blob);
+
+  undefined abort();
+
+  // states
+  const unsigned short EMPTY = 0;
+  const unsigned short LOADING = 1;
+  const unsigned short DONE = 2;
+
+
+  readonly attribute unsigned short readyState;
+
+  readonly attribute (DOMString or ArrayBuffer)? result;
+
+  readonly attribute DOMException? error;
+
+  // event handler attributes
+  attribute EventHandler onloadstart;
+  attribute EventHandler onprogress;
+  attribute EventHandler onload;
+  attribute EventHandler onabort;
+  attribute EventHandler onerror;
+  attribute EventHandler onloadend;
+};