Untitled

<head>
    <meta charset="UTF-8">
    <title class="timerForTitle">Title</title>
</head>
<body>

<script>
   if(!sessionStorage.timerForTitle){
       sessionStorage.timerForTitle = 30;
   }

  var timer =  setInterval(function () {
      var count = Number(sessionStorage.timerForTitle);
      if(--count >= 0){
          sessionStorage.timerForTitle = count;
          document.querySelector('.timerForTitle').innerHTML = 'Title '+count;
      }else{
          document.querySelector('.timerForTitle').innerHTML = 'Title finish';
          clearInterval(timer);
      }
  },1000);

</script>


</body>
</html>