title: Upload screenshots by Ctrl+V
body: <p>As I know it is <a href="https://stackoverflow.com/questions/12174068/upload-file-to-html5-page-using-keyboard-shortcuts">not</a> <a href="https://stackoverflow.com/questions/6582685/file-upload-via-local-file-path">possible</a> to upload the files by hooking <code>paste</code> event by javascript. <br>But I have found such thing on <a href="http://trello.com" rel="nofollow noreferrer">trello.com</a><br>
  How to reproduce: </p>
  
  <p><strong>Only on windows and with google chrome</strong> I can'not reproduce it on linux ff or chrome<br></p>
  
  <ol>
  <li>Create a new card</li>
  <li>Click on it -> it's form appeared</li>
  <li>Click on comment text area</li>
  <li>Make screenshot by <kbd>PrnScr</kbd>, <kbd>Ctrl</kbd>+<kbd>V</kbd> -> upload process started (green
  progress bar in right top corner)</li>
  </ol>
  
  <p>So how do they implemented it?</p>