Untitled

<!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">
<head>
  <meta content="text/html; charset=utf-8" http-equiv="content-type" />
  <title>CSSMQdemo</title>
<meta name="viewport" content="initial-scale=1, width=device-width">

<style type="text/css">
#text{
  color:#0f0;
}
@media only screen and (orientation:landscape){
#text{
  color:#f00;
}
}
@media only screen and (orientation:portrait){
#text{
  color:#00f;
}
}
</style>
        </head>

<body>


<span id="text">Le texte devrait être en vert par défaut, en rouge en landscape, et en bleu en portrait</span>


</body>

</html>