perchè usi lo STRICT.DTD? motivi particolari?

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN"
"http://www.w3.org/TR/html4/strict.dtd">
<html>
<head>
<script type="text/javascript" src="../js/js.js"></script>

<script>
if (...){
document.write('<STYLE type=text/css media=screen>@import url( file/css.css );</STYLE>');}
if (...){
document.write('<STYLE type=text/css media=screen>@import url( file/css2.css );</STYLE>');}
etc.etc.
</script>
<!--e qui vorrei mettere l'istruzione per il css>
<title>Anche noi del toro in B </title>

</head>

<body onLoad="sniffa();">
....bla blabla
</body>
</html>