timer.html

<!DOCTYPE html>
<html lang="en">
  <head>
    <meta charset="UTF-8" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <title>Timer</title>
    <script src="./node_modules/jquery/dist/jquery.min.js"></script>
    <script src="./node_modules/easytimer.js/dist/easytimer.min.js"></script>
  </head>
  <body style="background-color: rgb(53, 54, 58);">
    <div id="secondTenthsExample">
      <center>
        <div class="values" style="font-size: 150px; color: whitesmoke;"></div>
      </center>
    </div>
  </body>
  <script type="text/javascript">
    var timer = new easytimer.Timer();
    timer.start({ precision: 'secondTenths' });
    timer.addEventListener('secondTenthsUpdated', function (e) {
      $('#secondTenthsExample .values').html(
        timer.getTimeValues().toString(['minutes', 'seconds', 'secondTenths'])
      );
    });
  </script>
</html>