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chromium/third_party/blink/web_tests/http/tests/security/isolatedWorld/websocket/isolated-world-websocket-csp.html 

<!DOCTYPE html>
<html>
<head>
<meta http-equiv="Content-Security-Policy" content="connect-src 'none'">
<script src="isolated-world-websocket-csp.js"></script>
</head>
<body id="body">
    <p>
        This tests the interaction of websockets used in the isolated world with
        the isolated world CSP.
    </p>
</body>
</html>