title: difference between event.originalEvent.dataTransfer.files and event.dataTransfer.files in html 5
body: <p>What is the difference between </p>
  
  <pre><code>event.originalEvent.dataTransfer.files
  </code></pre>
  
  <p>and</p>
  
  <pre><code>event.dataTransfer.files
  </code></pre>
  
  <p>???</p>
  
  <p>Because in drag and drop , second code does not work and it is undefined and i had to use first code because it works !</p>