I'm using https://jqueryvalidation.org/ form validation plugin
When I put step="1" in a datetime-local input field to show seconds, if I'm validating that field with the plugin (just "required", for example), I get a javascript error saying "Step attribute on input type datetime-local is not supported". If I put this step="1" in a field that is not being validated, it works without problems.
$("#testingform").validate();<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<script src="https://cdn.jsdelivr.net/npm/jquery-validation@1.17.0/dist/jquery.validate.min.js"></script>
<form id="testingform">
<input type="datetime-local" step="1" name="date1" required>
<button type="submit">Send</button>
</form>... just put …