title: How to set viewport for specific devices only?
body: <p>I need to set <code>&lt;meta name="viewport" content="width=650" /&gt;</code> for all devices smaller than 480px (iPhones etc.).
  The most simple solution that came to my mind would be <code>&lt;meta name="viewport" content="width=650" media="only screen and (max-device-width: 480px)" /&gt;</code> but unfortunately the media-attribute is not allowed in meta-tags.</p>
  
  <p>The problem is that I don't want any viewport-declaration on iPads or at least with another "width".</p>
  
  <p>Are there any simple solutions before I'm going to implement WURFL and exclude the viewport-declaration with PHP?</p>