usando opportunamente la proprietà 'position'
codice:
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" lang="it" xml:lang="it">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1" />
<title>xhtml 1.0</title>
<style type="text/css">
div {
position : relative;
width : 300px;
height : 500px;
border : 1px solid #cca;
}
p {
margin : 0;
padding : 0;
width : 300px;
height : 120px;
position : absolute;
bottom : 0;
border : 1px solid #c00;
}
</style>
</head>
<body>
<div>
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</p>
</div>
</body>
</html>