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Test Info:

<!DOCTYPE html>
<html>
<head>
<script>
var f1, f2;
function b1()
{
f1 = document.getElementById("f1");
f2 = document.getElementById("f2");
f1.contentWindow.document.write("11");
f1.contentWindow.history.back();
setTimeout(b2, 0);
}
function b2()
{
f2.contentWindow.history.forward();
f2.contentWindow.location.reload();
f1.remove();
}
</script>
</script>
</head>
<body onload="setTimeout(b1, 0);">
<iframe id="f1" src="data:text/html,1"></iframe>
<iframe id="f2" src="data:text/html,2"></iframe>
</body>
</html>