gecko-dev/dom/workers/test/terminateSyncXHR_worker.js

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/**
* Any copyright is dedicated to the Public Domain.
* http://creativecommons.org/publicdomain/zero/1.0/
*/
onmessage = function(event) {
throw "No messages should reach me!";
}
var xhr = new XMLHttpRequest();
xhr.open("GET", "testXHR.txt", false);
xhr.addEventListener("loadstart", function ()
{
// Tell the parent to terminate us.
postMessage("TERMINATE");
// And wait for it to do so.
while(1) { true; }
});
xhr.send(null);