you are right I did miss <. When I looked at what the script was and saw the mistake and made the changes. it now work. Here is the script.
<!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" xml:lang="en" lang="en">
<head>
<meta http-equiv="content-type" content="text/html; charset=utf-8" />
<title>Welcome to this page!</title>
</head>
<body>
<h1>this is a basic XHTML page!</h1>
<br />
<p>Even with <span style="font-size:150%;">some</span> decoration, it's still not very exciting.</p>
</body>
</html>