Untitled

<html>
<head>
</head>
<body>
  <button>
  Fake button
  </button>
  <div style="z-index:100;position:absolute;top:0;left:0;border:1px solid black;background-color:green;height:50px;padding:10px">
  Press enter to see an alert (unless you're using IE!)
  </div>
</body>
</html>

$(document).on('keypress', function(e){
    alert(e.which)
})