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