<script>
if (window.testRunner)
    testRunner.dumpAsText();
</script>
<script src="data:text/javascript,document.write('<scr');"></script>ipt>
// <iframe onload="alert('FAIL: If this string is visible, then this test fails.')" src="about:blank"></iframe>
alert('PASS: This test passes if this string is alerted');
</script>