No funciona...
<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.1//EN"
"http://www.w3.org/TR/xhtml11/DTD/xhtml11.dtd">
<html>
<head>
<style>
#contenedor
{
position: relative;
}
#prueba
{
position: absolute;
bottom: 0%;
width: 800px;
height: 10px;
clear:both;
}
</style>
</head>
<body>
<div id="contenedor">
<div id="prueba">
prueba
</div>
</div>
</body>
</html>