JSFiddle - React, Tailwind, and code Playground

HTML

<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery-validate/1.15.0/jquery.validate.js"></script>
<form class="test" action="">
      <input class="soldbox" min="0" max="100" step="10"  type="number" required>
      <input name="markupbox" class="markupbox" min="0" max="100" step="0.10" type="number" required>
      <button type="submit">Validate</button>
</form>

JavaScript

$('.test').validate({
	rules: {
  	markupbox: {
    	step: false,
    }
  },
	submitHandler: function(form) {
    console.log($(form).valid());
  }
});