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diff --git a/dom/webidl/DataTransferItemList.webidl b/dom/webidl/DataTransferItemList.webidl
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+++ b/dom/webidl/DataTransferItemList.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://html.spec.whatwg.org/multipage/interaction.html#the-datatransferitemlist-interface
+ */
+
+[Exposed=Window]
+interface DataTransferItemList {
+  readonly attribute unsigned long length;
+  getter DataTransferItem (unsigned long index);
+  [Throws, NeedsSubjectPrincipal]
+  DataTransferItem? add(DOMString data, DOMString type);
+  [Throws, NeedsSubjectPrincipal]
+  DataTransferItem? add(File data);
+  [Throws, NeedsSubjectPrincipal]
+  void remove(unsigned long index);
+  [Throws, NeedsSubjectPrincipal]
+  void clear();
+};