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<!DOCTYPE html> <html> <body> <input type="month" id="myMonth" readonly> <p>Click the button to find out if the month field is read-only or not.</p> <button onclick="myFunction()">Try it</button> <p><strong>Note:</strong> input elements with type="month" are not supported in Internet Explorer or Firefox.</p> <p id="demo"></p> <script> function myFunction() { var x = document.getElementById("myMonth").readOnly; document.getElementById("demo").innerHTML = x; } </script> </body> </html>