1 Connecting to a server that doesn't respond.

     2 Run this from a local file to avoid cross-origin code path.

     3 

     4 <script>

     5 var req = new XMLHttpRequest;

     6 req.open("GET", "http://127.0.0.1:7", true);

     7 req.send();

     8 req.onerror = function() { document.write("onerror<br>"); }

     9 alert("PASSED if no crash or assertion failure");

    10 </script>