title: window.applicationCache
body: <p>Using HTML5 manifest file and cache is working fine. </p>
  
  <p>I use window.applicationCache.update() to download the updated version. works fine.  </p>
  
  <p>How can I check to see if the manifest file has been updated so an update is available but not start downloading. Reason for this I want the user to allow the update or not as they may be in a bad network connection area.</p>