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chromium/third_party/blink/web_tests/http/tests/security/sandboxed-iframe-form-top.html 

<html>
<head>
<script>
if (window.testRunner) {
    testRunner.dumpAsText();
    testRunner.waitUntilDone();
}
</script>
</head>
<body>
<p>This tests passes if the sandboxed frame cannot navigate the top frame.</p>
<p>PASS</p>
<iframe sandbox="allow-forms allow-scripts"
        src="resources/sandboxed-iframe-form-top.html">
</iframe>
</body>
</html>