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<!DOCTYPE html> <html> <body> Date: <input type="datetime-local" id="myLocalDate" step=".1"> <p>Click the button to change the value of the step attribute of the local date field (milliseconds interval).</p> <p><b>Tip:</b> Try the up and down arrows in the local date field for milliseconds before and after you click the button.</p> <button onclick="myFunction()">Try it</button> <p><strong>Note:</strong> input elements with type="datetime-local" do not show as any datetime field/calendar in Firefox.</p> <p id="demo"></p> <script> function myFunction() { document.getElementById("myLocalDate").step = ".020"; document.getElementById("demo").innerHTML = "The value of the step attribute was changed from '.1' to '.050'."; } </script> </body> </html>