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<!DOCTYPE html>
<html>
<body>
Week: <input type="week" id="myWeek">
<p>Click the button to change the value of the step attribute of the week field.</p>
<p><b>Tip:</b> Open the calendar on the right side of the week field before and after you click the button, to see the effect.</p>
<button onclick="myFunction()">Try it</button>
<p id="demo"></p>
<script>
function myFunction() {
  document.getElementById("myWeek").step = "2";
  document.getElementById("demo").innerHTML = "Step was set to '2', meaning that the user can only select every second week in the calendar.";
}
</script>
</body>
</html>