Firesheep: Kompatibilitätsmodus fehler

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Firefox Opera google crom lösen die Seite auf aber der IE8 nicht wieso?

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN"

<HTML="http://www.w3.org/TR/html4/strict.dtd">
<meta http-equiv="X-UA-Compatible" content="IE=8" />

<title> Div Container </title>

<head></head>

<style type="text/css">
<!--

#divHeader{
         position:                   relative;
         background-color:           FFFF00;
         height:                     160;
         width:                      980;
text-align: center;
}
#divNavi{
        position:                    relative;
        background-color:           #FF0000;
        height:                      900;
        width:                       180;
margin:    0px auto  ;
float:    left;
border-left:0;
}
#divcontent {
         position:                  relative;
background-color:          #4682b4;
         height:                    900;
         width:                     800;
margin:                     0px 180px ;

}
#divfooter
    {
         position:                   relative;
         background-color:           #9acd32;
         height:                     60;
         width:                      980;
text-align: center;

}

-->
</style>
<body>
<div style="margin:0px auto; width:980px">
<div id="divHeader"><h1>Herzlich Willkommen</h1></div>
<div id="divNavi">
<p>Startseite</p>
<p>Programm</p>
<p>Stadtplan</p>
<p>Hintergrund</p>
<p>Kontakt</p>
</div>
<div id="divcontent">Guten Tag</div>
<div id="divfooter">Diese Seite ist mein versuch</div>
</div>
</body>
</html>