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Test Info:

<!DOCTYPE html>
<html>
<head>
<script>
var w;
function b1()
{
w = window.open("404.gif", "w2", "f");
setTimeout(b2, 1200);
}
function b2()
{
w.close();
setTimeout(b3, 500);
}
function b3()
{
w.location = "data:text/html,2";
document.body.appendChild(document.createTextNode("Done"));
}
</script>
</head>
<body>
<div><button onclick="b1();">Start test</button></div>
</body>
</html>