JSFiddle - React, Tailwind, and code Playground

HTML

<script src="http://ajax.aspnetcdn.com/ajax/jquery.validate/1.10.0/jquery.validate.min.js"></script>
<script src="http://ajax.aspnetcdn.com/ajax/jquery.validate/1.10.0/additional-methods.js"></script>
<form id="myform">
  <input class="fillone" type="text" name="field1" />
  <br/>
  <input class="fillone" type="text" name="field2" />
  <br/>
  <input type="submit" />
</form>
<a id="docs" href="http://docs.jquery.com/Plugins/Validation" target="_blank">Validation Documentation</a>

CSS

#docs {
  display: block;
  position: absolute;
  bottom: 0;
}

JavaScript

$(document).ready(function () {
    
  var validator = validation_rules('#myform');
  validator.form();
  
  function validation_rules(form) {
    $.validator.addMethod("xrequire_from_group", $.validator.methods.require_from_group, 'Hey nutter, pick at least one');

    $.validator.addClassRules("fillone", {
      xrequire_from_group: [1, ".fillone"]
    });

    var validator = $(form).validate({});
    return validator;
  }

});