spec/fixtures/pages/close.html (9 lines of code) (raw):
<html>
<link rel="icon" type="image/png" href="/favicon.png"/>
<link rel="icon" type="image/png" href="http://test.com/favicon.png"/>
<body>
<script type="text/javascript" charset="utf-8">
window.close();
</script>
</body>
</html>