LayoutTests/fast/xmlhttprequest/xmlhttprequest-gc.html - WebKit - Git at Google

 <html>
 <script>
 function stateChange() {
     document.write(this.foo + '<br>');
     if (this.readyState == 4) {
         if (window.testRunner)
             testRunner.notifyDone();
     }
 }

 function collectGarbage() {
     if (window.GCController) {
         window.GCController.collect();
     } else {
       for (var i = 0; i < 50000; i++)
           new Object();
     }
 }

 function runTest() {
     document.write("Tests that garbage collection doesn't drop the XMLHttpRequest JS wrapper until the send command is done.  You should see 'bar' four times below.<br>");

     if (window.testRunner) {
         testRunner.dumpAsText();
         testRunner.waitUntilDone();
     }

     var xhr = new XMLHttpRequest();
     xhr.foo = 'bar';
     xhr.onreadystatechange = stateChange;
     xhr.open("GET", "xmlhttprequest-gc.html", true);
     xhr.send(null);

     xhr = null;
     collectGarbage();
 }

 </script>
 <body onload='runTest()'>
 </body>
 </html>
	<html>
	<script>
	function stateChange() {
	document.write(this.foo + '<br>');
	if (this.readyState == 4) {
	if (window.testRunner)
	testRunner.notifyDone();
	}
	}

	function collectGarbage() {
	if (window.GCController) {
	window.GCController.collect();
	} else {
	for (var i = 0; i < 50000; i++)
	new Object();
	}
	}

	function runTest() {
	document.write("Tests that garbage collection doesn't drop the XMLHttpRequest JS wrapper until the send command is done. You should see 'bar' four times below.<br>");

	if (window.testRunner) {
	testRunner.dumpAsText();
	testRunner.waitUntilDone();
	}

	var xhr = new XMLHttpRequest();
	xhr.foo = 'bar';
	xhr.onreadystatechange = stateChange;
	xhr.open("GET", "xmlhttprequest-gc.html", true);
	xhr.send(null);

	xhr = null;
	collectGarbage();
	}

	</script>
	<body onload='runTest()'>
	</body>
	</html>