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<!DOCTYPE html>
<html>
<body>
Time: <input type="time" id="myTime" value="16:32:55">
<p>Click the button to decrement the value of the time field by 10 minutes (each time you click).</p>
<button onclick="myFunction()">Try it</button>
<script>
function myFunction() {
  document.getElementById("myTime").stepDown(10);
}
</script>
</body>
</html>