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<html><body><input type="month" id="myMonth"><br><br><button onclick="disableBtn()">Disable Month Field</button><button onclick="undisableBtn()">Undisable Month Field</button><p><strong>Note:</strong> input elements with type="month" do not show as any date field/calendar in Firefox.</p><script>function disableBtn() { document.getElementById("myMonth").disabled = true;}function undisableBtn() { document.getElementById("myMonth").disabled = false;}</script></body></html>