JSFiddle - React, Tailwind, and code Playground

HTML

<script src="http://ajax.aspnetcdn.com/ajax/jquery.validate/1.13.0/jquery.validate.js"></script>
<link rel="stylesheet" href="//maxcdn.bootstrapcdn.com/bootstrap/3.2.0/css/bootstrap.min.css">
<!--
NOTE: Both the JS and CSS panels contain only
      code for the "chosen" plugin.
-->

<form>
    <label>Name: <input name="test1" required></label>
        <br/>
    <label>Favorite Color:
        <select class="select-chosen" name="test2" required>
            <option value=""></option>
            <option value="red">Red</option>
            <option value="blue">Blue</option>
            <option value="green">Green</option>
        </select>
    </label>
        <br/>
    <input type="submit">
</form>

<script>
$(document).ready(function(){
    $('select').chosen();
    $('form').validate();
    
    
    $('form').on('submit', function(event) {
        event.preventDefault();
        if($('form').valid() == true && $('.select-chosen').valid() == true){
            console.log("Valid form");
        } else {
            console.log("Invalid form");
        }
    }); 
});
</script>

CSS

/*!
Chosen, a Select Box Enhancer for jQuery and Prototype
by Patrick Filler for Harvest, http://getharvest.com

Version 1.1.0
Full source at https://github.com/harvesthq/chosen
Copyright (c) 2011 Harvest http://getharvest.com

MIT License, https://github.com/harvesthq/chosen/blob/master/LICENSE.md
This file is generated by `grunt build`, do not edit it by hand.
*/

/* @group Base */
.chosen-container {
  position: relative;
  display: inline-block;
  vertical-align: middle;
  font-size: 13px;
  zoom: 1;
  *display: inline;
  -webkit-user-select: none;
  -moz-user-select: none;
  user-select: none;
}
.chosen-container .chosen-drop {
  position: absolute;
  top: 100%;
  left: -9999px;
  z-index: 1010;
  -webkit-box-sizing: border-box;
  -moz-box-sizing: border-box;
  box-sizing: border-box;
  width: 100%;
  border: 1px solid #aaa;
  border-top: 0;
  background: #fff;
  box-shadow: 0 4px 5px rgba(0, 0, 0, 0.15);
}
.chosen-container.chosen-with-drop .chosen-drop {
  left: 0;
}
.chosen-container a {
  cursor: pointer;
}

/* @end */
/* @group Single Chosen */
.chosen-container-single .chosen-single {
  position: relative;
  display: block;
  overflow: hidden;
  padding: 0 0 0 8px;
  height: 23px;
  border: 1px solid #aaa;
  border-radius: 5px;
  background-color: #fff;
  background: -webkit-gradient(linear, 50% 0%, 50% 100%, color-stop(20%, #ffffff), color-stop(50%, #f6f6f6), color-stop(52%, #eeeeee), color-stop(100%, #f4f4f4));
  background: -webkit-linear-gradient(top, #ffffff 20%, #f6f6f6 50%, #eeeeee 52%, #f4f4f4 100%);
  background: -moz-linear-gradient(top, #ffffff 20%, #f6f6f6 50%, #eeeeee 52%, #f4f4f4 100%);
  background: -o-linear-gradient(top, #ffffff 20%, #f6f6f6 50%, #eeeeee 52%, #f4f4f4 100%);
  background: linear-gradient(top, #ffffff 20%, #f6f6f6 50%, #eeeeee 52%, #f4f4f4 100%);
  background-clip: padding-box;
  box-shadow: 0 0 3px white inset, 0 1px 1px rgba(0, 0, 0, 0.1);
  color: #444;
  text-decoration: none;
  white-space: nowrap;
  line-height:...

JavaScript

/* Chosen v1.1.0 | (c) 2011-2013 by Harvest | MIT License, https://github.com/harvesthq/chosen/blob/master/LICENSE.md */
!function(){var a,AbstractChosen,Chosen,SelectParser,b,c={}.hasOwnProperty,d=function(a,b){function d(){this.constructor=a}for(var e in b)c.call(b,e)&&(a[e]=b[e]);return d.prototype=b.prototype,a.prototype=new d,a.__super__=b.prototype,a};SelectParser=function(){function SelectParser(){this.options_index=0,this.parsed=[]}return SelectParser.prototype.add_node=function(a){return"OPTGROUP"===a.nodeName.toUpperCase()?this.add_group(a):this.add_option(a)},SelectParser.prototype.add_group=function(a){var b,c,d,e,f,g;for(b=this.parsed.length,this.parsed.push({array_index:b,group:!0,label:this.escapeExpression(a.label),children:0,disabled:a.disabled}),f=a.childNodes,g=[],d=0,e=f.length;e>d;d++)c=f[d],g.push(this.add_option(c,b,a.disabled));return g},SelectParser.prototype.add_option=function(a,b,c){return"OPTION"===a.nodeName.toUpperCase()?(""!==a.text?(null!=b&&(this.parsed[b].children+=1),this.parsed.push({array_index:this.parsed.length,options_index:this.options_index,value:a.value,text:a.text,html:a.innerHTML,selected:a.selected,disabled:c===!0?c:a.disabled,group_array_index:b,classes:a.className,style:a.style.cssText})):this.parsed.push({array_index:this.parsed.length,options_index:this.options_index,empty:!0}),this.options_index+=1):void 0},SelectParser.prototype.escapeExpression=function(a){var b,c;return null==a||a===!1?"":/[\&\<\>\"\'\`]/.test(a)?(b={"<":"&lt;",">":"&gt;",'"':"&quot;","'":"&#x27;","`":"&#x60;"},c=/&(?!\w+;)|[\<\>\"\'\`]/g,a.replace(c,function(a){return b[a]||"&amp;"})):a},SelectParser}(),SelectParser.select_to_array=function(a){var b,c,d,e,f;for(c=new SelectParser,f=a.childNodes,d=0,e=f.length;e>d;d++)b=f[d],c.add_node(b);return c.parsed},AbstractChosen=function(){function...