<!DOCTYPE html>
<html>
<body>
<iframe id="frame" src="about:blank"></iframe>
<script>
var query = window.location.search;
if (!query)
    document.getElementById("frame").src = "WillPerformClientRedirectToURLCrash.html?FAIL";
else if (query == "?PASS")
    alert("PASS");
else
    alert("FAIL");
</script>
</body>
</html>