1 <script> 2 try { 3 var req = new XMLHttpRequest; 4 req.open("GET", "simple.txt", false); 5 req.send(null); 6 alert("FAIL, unexpected response: " + req.responseText); 7 } catch (ex) { 8 // Loading should fail, because simple.txt is not in cache manifest. 9 parent.postMessage("allDone", "*"); 10 } 11 </script> 12