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<!DOCTYPE html>
<html>
<body>
Birthday (month and year): <input type="month" id="myMonth" name="bdaymonth">
<p>Click the buttons to display and/or change the value of the name attribute of the month field.</p>
<button onclick="display()">Display name</button>
<button onclick="change()">Change name</button>
<p><strong>Note:</strong> input elements with type="month" do not show as any date field/calendar in Firefox.</p>
<script>
function display() {
  var x = document.getElementById("myMonth").name;
  alert("The name of the month field is: " + x);
}
function change() {
  var x = document.getElementById("myMonth").name = "newMonthName";
  alert ("The name was changed to: " + x);
}
</script>
</body>
</html>