
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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