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diff --git a/testing/web-platform/tests/service-workers/stub-4.2-client.html b/testing/web-platform/tests/service-workers/stub-4.2-client.html
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+++ b/testing/web-platform/tests/service-workers/stub-4.2-client.html
@@ -0,0 +1,61 @@
+<!DOCTYPE html>
+<html>
+<title>Service Workers: Client</title>
+    <head>
+        <link rel="help" href="https://w3c.github.io/ServiceWorker/#client">
+        <script src="/resources/testharness.js"></script>
+        <script src="/resources/testharnessreport.js"></script>
+
+        <script src=/resources/WebIDLParser.js></script>
+        <script src=/resources/idlharness.js></script>
+
+    </head>
+    <body>
+
+<script type=text/plain id="idl_0">
+[Constructor()] // no-op constructor
+interface Client {
+  readonly attribute unsigned long id;
+  void postMessage(any message, DOMString targetOrigin,
+                   optional sequence<Transferable> transfer);
+};
+</pre>
+
+<!--
+The `Client` interface represents the window or the worker (defined as client)
+that is [controlled][1] by the Service Worker. This object provides a no-op
+constructor. Callers should note that only `Client` objects created by the user
+agent (see [`this.clients.getServiced()`][2]) will provide meaningful
+functionality.
+
+The `id` of a `Client` identifies the specific client object from the list of
+client objects serviced by the Service Worker. The `postMessage(message,
+targetOrigin, transfer)` method of a `[Client][3]`, when called, causes a
+`[MessageEvent][4]` to be dispatched at the client object.
+
+
+
+[1]: #document-control
+[2]: #get-serviced-method
+[3]: #client-interface
+[4]: http://goo.gl/4SLWiH
+-->
+
+
+    <script type=text/plain id="untested_idls">
+        interface Transferable {};
+    </pre>
+
+    <script>
+        var idl_array = new IdlArray();
+        idl_array.add_untested_idls(document.getElementById("untested_idls").textContent);
+        idl_array.add_idls(document.getElementById("idl_0").textContent);
+        idl_array.add_objects({
+            Client: ["throw new Error ('No object defined for the Client interface')"]
+        });
+        idl_array.test();
+    </script>
+
+    </body>
+</html>
+