title: How does panopticlick detect fonts available in a browser?
body: <p>You can determine if specific a font is installed or not by checking if text in that font has a different size than normal text (<a href="http://www.lalit.org/lab/javascript-css-font-detect" rel="nofollow">source</a>).  </p>
  
  <p>But <a href="http://panopticlick.eff.org" rel="nofollow">panopticlick.eff.org</a> seems to be getting my complete list, are they just checking every they know of?  I can't see that info in the HTTP Request, is there just something in the DOM I can query for a list of available fonts?</p>