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diff --git a/dom/chrome-webidl/StructuredCloneHolder.webidl b/dom/chrome-webidl/StructuredCloneHolder.webidl
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+++ b/dom/chrome-webidl/StructuredCloneHolder.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/.
+ */
+
+/**
+ * A holder for structured-clonable data which can itself be cloned with
+ * little overhead, and deserialized into an arbitrary global.
+ */
+[ChromeOnly, Exposed=(Window,Worker)]
+interface StructuredCloneHolder {
+  /**
+   * Serializes the given value to an opaque structured clone blob, and
+   * returns the result.
+   *
+   * The serialization happens in the compartment of the given global or, if no
+   * global is provided, the compartment of the data value.
+   */
+  [Throws]
+  constructor(any data, optional object? global = null);
+
+  /**
+   * Deserializes the structured clone data in the scope of the given global,
+   * and returns the result.
+   *
+   * If `keepData` is true, the structured clone data is preserved, and can be
+   * deserialized repeatedly. Otherwise, it is immediately discarded.
+   */
+  [Throws]
+  any deserialize(object global, optional boolean keepData = false);
+};