<!DOCTYPE html>
<html>

  <head>
    <link rel="stylesheet" href="style.css">
    <script data-require="jquery" data-semver="2.1.4" src="http://code.jquery.com/jquery-2.1.4.min.js"></script>
    <script src="script.js"></script>
  </head>

  <body>
    <span id="message"></span>
  </body>

</html>
// Code goes here
jQuery(function(){
  var message = 'HELLO WORLD';
  var container = $('#message');
  window.setInterval(function frame(){
    var _current = container.text();
    if (_current.length == message.length){
        _current = '';
    }

    container.text(message.substr(0, _current.length + 1));
  }, 1000 / 10);
});
/* Styles go here */

#message {
    color: #d1d1d1;
    font-weight: bold;
    font-size: 60px;
}
# HELLO Plunker

this is my first plunker