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diff --git a/dom/serviceworkers/test/download/window.html b/dom/serviceworkers/test/download/window.html
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+<!--
+ Any copyright is dedicated to the Public Domain.
+ http://creativecommons.org/publicdomain/zero/1.0/
+-->
+<!DOCTYPE HTML>
+<html>
+<head>
+</head>
+<body>
+<script type="text/javascript">
+
+function wait_until_controlled() {
+ return new Promise(function(resolve) {
+ if (navigator.serviceWorker.controller) {
+ return resolve();
+ }
+ navigator.serviceWorker.addEventListener('controllerchange', function onController() {
+ if (navigator.serviceWorker.controller) {
+ navigator.serviceWorker.removeEventListener('controllerchange', onController);
+ return resolve();
+ }
+ });
+ });
+}
+addEventListener('load', function(event) {
+ var registration;
+ navigator.serviceWorker.register('worker.js').then(function(swr) {
+ registration = swr;
+
+ // While the iframe below is a navigation, we still wait until we are
+ // controlled here. We want an active client to hold the service worker
+ // alive since it calls unregister() on itself.
+ return wait_until_controlled();
+
+ }).then(function() {
+ var frame = document.createElement('iframe');
+ document.body.appendChild(frame);
+ frame.src = 'fake_download';
+
+ // The service worker is unregistered in the fetch event. The window and
+ // frame are cleaned up from the browser chrome script.
+ });
+});
+</script>
+</body>
+</html>