chromium/chrome/test/data/extensions/api_test/webrequest_hosted_app/index.html

<!--
Copyright 2015 The Chromium Authors
Use of this source code is governed by a BSD-style license that can be
found in the LICENSE file.
-->
<script>
console.assert(chrome.app.isInstalled, 'This page should be a hosted app.');

fetch('./index.html').catch(function() {
  console.error('fetch unexpectedly failed!');
});
</script>