Can someone explain to me exactly what this is doing and how it interacts with IE in a sense of document mode and browser mode.
<link rel="stylesheet" type="text/css" href="site.css"/>
<!--[if IE 6]>
<link rel="stylesheet" type="text/css" href=" ie6.css" />
<![endif]-->
<!--[if IE 7]>
<link rel="stylesheet" type="text/css" href=" ie7.css" />
<![endif]-->
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