chromium/third_party/blink/web_tests/fast/frames/sandboxed-iframe-domain.html

<!DOCTYPE html>
<html>
<head>
<script>
if (window.testRunner) {
    testRunner.dumpAsText();
    testRunner.waitUntilDone();
}

function done()
{
    if (window.testRunner)
        testRunner.notifyDone();
}
</script>
</head>
<body>
<iframe sandbox="allow-scripts" src="data:text/html,<script>document.domain='127.0.0.1'</script>" onload="done()">
</iframe>
</body>
</html>