META tag Refresh Method
none of the above methods worked for me,
but success if I did a:
<META
HTTP-EQUIV="Refresh"
CONTENT="1; URL=webclose.html">
...and then created webclose.html:
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1" />
<meta http-equiv="cache-control" content="no-cache" />
<meta http-equiv="pragma" content="no-cache" />
<meta http-equiv="expires" content="-1" />
<title>closing</title>
</head>
<body onload="self.close();">
</body>
</html>
...go figure. I'm guessing the 1 sec delay lets the client browser better assimilate the requested windows management.