title: What is different between HTML5 Polyfill and Fallback?
body: <p>In <a href="http://html5please.com" rel="noreferrer">http://html5please.com</a> the each features listed by saying use with Polyfill or Fallback. I was wondering what is the different both? kindly help me in understanding the different. </p>
  
  <p>Thanks in advance.  </p>