<html>
<body>
<input type="month" id="myMonth" disabled>
<p>Click the button to find out if the month field is disabled.</p>
<button onclick="myFunction()">Try it</button>
<p><strong>Note:</strong> input elements with type="month" do not show as any date field/calendar in Firefox.</p>
<p id="demo"></p>
<script>
function myFunction() {
var x = document.getElementById("myMonth").disabled;
document.getElementById("demo").innerHTML = x;
}
</script>
</body>
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</html>