A Glimpse into the Future of CSS

<!DOCTYPE html>
<html>

  <head>
    <style data-hitch-interpret>
      #indicator:returning-visit(2)::after {
        color: red;
        content: ' Welcome back!';
      }
    </style>
    
    <script src="http://www.hitchjs.com/dist/hitch-0.6.3.min.js"></script>
    <script src="script.js"></script>
  </head>

  <body>
    <div id="indicator">Hi!</div>
  </body>

</html>

Hitch.add([{
  name: 'returning-visit',  
  filter: function(match, arg) {
    var count = +localStorage.getItem('returningVisit') || 0;
    
    localStorage.setItem('returningVisit', count + 1);
    
    return count >= arg;
  }
}]);