<!DOCTYPE html>
<html>
<head>
<script>
    if (window.testRunner) {
        testRunner.dumpAsText();
        testRunner.dumpPolicyDelegateCallbacks();
    }
</script>
</head>
<body>
    <p>Test passes if the second iframe navigates to about:blank.</p>
    <iframe src="data:text/html,
    <iframe id='iframe' src='<p>FAILURE</p>'></iframe>"></iframe>
</body>
</html>