Membuat Timer dengan javascript (HTML,JAVASCRIPT)

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code:

<!DOCTYPE html>
<html>
<head>
  <title></title>
</head>
<body>
  <h1 style="float:right;"><span id="demo1"></span>:<span id="demo"></span></h1>
  <script type="text/javascript">
    let second = 0;
    let minutes = 0;
    setInterval(function(){
      second++;
      document.getElementById('demo').innerHTML = second;
      document.getElementById('demo1').innerHTML = minutes;
      if(second == 60){
        minutes++;
        document.getElementById('demo1').innerHTML = minutes;
        second = 0;
      }
    },100);
  </script>
</body>
</html>

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