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<!DOCTYPE html> <html> <body> Number: <input type="number" id="myNumber" step="3"> <p>Click the button to change the value of the step attribute of the number field.</p> <button onclick="myFunction()">Try it</button> <p><strong>Note:</strong> input elements with type="number" are not supported in IE 9 and earlier versions.</p> <p id="demo"></p> <script> function myFunction() { var x = document.getElementById("myNumber").step = "5"; document.getElementById("demo").innerHTML = "The value of the step attribute was changed from '3' to '5'."; } </script> </body> </html>