<html>
<script>
if (window.testRunner) {
    testRunner.dumpAsText();
    testRunner.waitUntilDone();
}
var i = 0;
function test() {
    try {
        o1 = {
            toString : function () {
                i++;
                if (i<50)
                    document.getElementById("testFrame").contentDocument.location = o1;
                else
                    alert("completed o1.toString()");
                document.open();
                return "data:text/plain,o1-" + i;
            }
        }
        o2 = {
            get toString() {
                i++;
                if (i<50)
                    document.getElementById("testFrame").contentDocument.location = o2
                else
                    alert("completed o2.toString");
                document.open();
                return function(){ return "data:text/plain,o2-" + i; }
            }
        }

        tmp = document.getElementById("testFrame");
        i = 0;
        tmp.contentDocument.location = o1;
        document.write("<iframe src='about:blank' id='testFrame'/>");
        tmp = document.getElementById("testFrame");
        i = 0;
        tmp.contentDocument.location = o2;
    } finally {
        if (window.testRunner)
            testRunner.notifyDone();
    }
}
</script>
<body id="log" onload="test()">
<iframe src="about:blank" id="testFrame"/>
</body>
</html>