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chromium/chrome/test/data/extensions/platform_apps/web_view/download/guest.html 

<!--
Copyright 2013 The Chromium Authors
Use of this source code is governed by a BSD-style license that can be
found in the LICENSE file.
-->
<html>
  <head>
    <script type="text/javascript">
      function startDownload(elementId) {
        document.getElementById(elementId).click();
      }
    </script>
  </head>
  <body>
    <div>This is guest that initiates download.</div>
    <a href="expect-deny.zip"
        download="download"
        id="download-link-1">Embedder is expected to deny this download link.</a>
    <a href="expect-allow.zip"
        download="download"
        id="download-link-2">Embedder is expected to allow this download link.</a>
    <a href="expect-ignore.zip"
        download="download"
        id="download-link-3">Embedder is expected to ignore this download link (which is equivalent of denying).</a>
  </body>
</html>