title: How to play a sound when my index.html changes
body: <p>I upload every 1 minute my index.html to an ftp. Sometimes the index stays the same, sometimes it is changes a little. I am looking for a way to play a sound when my index.html changes. 
  I refresh the page automatically every 20 seconds  . I want to play a sound if it has changed, Maybe it can read the size of the file and if it is diferent to play a sound? – </p>
  
  <p>Is it possible? </p>
  
  <p>Thank you for your time and for sharing your skills.</p>