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diff --git a/dom/webidl/QueuingStrategy.webidl b/dom/webidl/QueuingStrategy.webidl
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+++ b/dom/webidl/QueuingStrategy.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://streams.spec.whatwg.org/#qs
+ */
+
+dictionary QueuingStrategy {
+  unrestricted double highWaterMark;
+  QueuingStrategySize size;
+};
+
+callback QueuingStrategySize = unrestricted double (optional any chunk);
+
+dictionary QueuingStrategyInit {
+  required unrestricted double highWaterMark;
+};
+
+
+[Exposed=*]
+interface CountQueuingStrategy {
+  constructor(QueuingStrategyInit init);
+
+  readonly attribute unrestricted double highWaterMark;
+
+  [Throws]
+  readonly attribute Function size;
+};
+
+[Exposed=*]
+interface ByteLengthQueuingStrategy {
+  constructor(QueuingStrategyInit init);
+
+  readonly attribute unrestricted double highWaterMark;
+
+  [Throws]
+  readonly attribute Function size;
+};