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diff --git a/dom/webidl/URLSearchParams.webidl b/dom/webidl/URLSearchParams.webidl
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+++ b/dom/webidl/URLSearchParams.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://url.spec.whatwg.org/#urlsearchparams
+ *
+ * To the extent possible under law, the editors have waived all copyright
+ * and related or neighboring rights to this work. In addition, as of 17
+ * February 2013, the editors have made this specification available under
+ * the Open Web Foundation Agreement Version 1.0, which is available at
+ * http://www.openwebfoundation.org/legal/the-owf-1-0-agreements/owfa-1-0.
+ */
+
+[Exposed=(Window,Worker,WorkerDebugger),
+ Serializable]
+interface URLSearchParams {
+  [Throws]
+  constructor(optional (sequence<sequence<USVString>> or
+                        record<USVString, USVString> or USVString) init = "");
+
+  readonly attribute unsigned long size;
+
+  undefined append(USVString name, USVString value);
+  undefined delete(USVString name, optional USVString value);
+  USVString? get(USVString name);
+  sequence<USVString> getAll(USVString name);
+  boolean has(USVString name, optional USVString value);
+  undefined set(USVString name, USVString value);
+
+  [Throws]
+  undefined sort();
+
+  iterable<USVString, USVString>;
+  stringifier;
+};