mozFullScreen

<html>

  <head>

  </head>

  <body>
  <a href="#" id="requestFS">Request Full Screen</a>
  <br />
  <a href="#" id="cancelFS">Cancel Full Screen</a>


  <script>

    document.getElementById("requestFS").addEventListener("click", function () {
      console.log("Request Full Screen");
      document.body.mozRequestFullScreen();
    }, false);

    document.getElementById("cancelFS").addEventListener("click", function () {
      console.log("Cancel Full Screen");
      document.mozCancelFullScreen();
    }, false);

    document.addEventListener("mozfullscreenchange", function (e) {
      console.log("Screen changed");
    }, false)

    document.body.mozRequestFullScreen();
  </script>

  </body>

</html>