title: Use favicon to track user visit to a website
body: <p>I read in <a href="https://stackoverflow.com/questions/5100554/how-website-can-track-users-even-after-clearing-browser-cookies/5100819#5100819">this answer to <em>"How website can track users even after clearing browser cookies"</em></a> that a user can be tracked via the website favicon:</p>
  
  <blockquote>
    <p>Favicons are a third possibility--which most browsers request before
    the page is loaded, so if that request is satisfied, then the client
    is obviously a repeat visitor.</p>
  </blockquote>
  
  <p>If this is actually possible it can be a good way of checking if the user visited the website before, don't needing to use cookies for that porpouse.</p>
  
  <p>I'm not really sure if this is something that I can accomplish with PHP or Javascript (jQuery).
  How can this be achieved?</p>
  
  <p><strong>EDIT</strong>:</p>
  
  <p>What I interpreted with this is that the user makes a call if he needs the Favicon. If he does not make that call it means he already has the favicon so he visited. So there is no need to store any file (cookie for example) in the user computer or keep its IP in the server. Is this correct?</p>