<!DOCTYPE html>
<html leng = 'en'>
<head>
<meta charset = 'UTF-8'/>
<style>
input{
border:1px solid rgba(0,0,0,0,8);
text-align:right;
font-size:20px;
font-weight:bold;
}
</style>
</head>
<body>
minutes:<input type = 'text' value = '0'>
seconds:<input type = 'text' value = '0'>
<script>
var input1 = document.getElementsByTagName('input')[0];
var input2 = document.getElementsByTagName('input')[1];
var timer = setInterval(function (){
if(Number(input1.value) != 3){
if(Number(input2.value) < 59){
input2.value = Number(input2.value) +1;
}else{
input2.value = 0;
input1.value = Number(input1.value) +1;
}
}else{
clearInterval(timer);
}
},100);
</script>
</body>
</html>