JSFiddle - React, Tailwind, and code Playground

HTML

<script src="http://1054.fleeceitout.com/jquery.bgiframe.js"></script>
<script src="http://1054.fleeceitout.com/jquery.mcdropdown.js"></script>
<ul id="categorymenu" class="mcdropdown_menu">
    <li rel="1">Arts &amp; Humanities
        <ul>
            <li rel="2">Photography
                <ul>
                    <li rel="3">3D</li>
                    <li rel="4">Digital</li>
                </ul>
            </li>
            <li rel="5">History</li>
            <li rel="6">Literature</li>
        </ul>
    </li>
    <li rel="7">Business &amp; Economy</li>
    <li rel="8">Computers &amp; Internet</li>
    <li rel="9">Education</li>
    <li rel="11">Entertainment
        <ul>
            <li rel="12">Movies</li>
            <li rel="13">TV Shows</li>
            <li rel="14">Music</li>
            <li rel="15">Humor</li>
        </ul>
    </li>
    <li rel="10">Health</li>
</ul>
<div class="test">
    <input type="text" class="category" name="category" id="category" value="" />
    <input type="text" class="category" name="category_1" id="category_1" value="" />
</div>

CSS

div.mcdropdown {
    position: absolute;
    border: 1px solid #8e9daa;
    padding: 1px;
    display: -moz-inline-block;
    display: inline-block;
    width: 408px;
    height: 14px;
    padding: 2px;
}
/* style either the input or div where the plug-in is attached to */
 div.mcdropdown input, div.mcdropdown div {
    position: absolute;
    background-color: #fff;
    left: 0;
    top: 0;
    width: 98%;
    border: 0;
    padding: 2px 0 0 3px;
    font: 11px Arial, Helvetica, sans-serif;
}
div.mcdropdown a {
    position: absolute;
    right: 1px;
    top: 1px;
    background: transparent url(../images/mcdropdown/mcdd_select_button_sprite.gif) no-repeat top left;
    display: -moz-inline-block;
    display: inline-block;
    height: 16px;
    width: 15px;
    text-decoration: none;
    font-size: 0pt;
    z-index: 2;
    outline: 0;
}
div.mcdropdown a:hover, div.mcdropdown a:focus {
    background-position: 0% -16px;
}
div.mcdropdown a:active {
    background-position: 0% -32px;
    outline: none;
    /* hide dotted outline in Firefox */
}
div.mcdropdownDisabled {
    background-color: #e1e0e0;
    filter:alpha(opacity=75);
    -moz-opacity: 0.75;
    opacity: 0.75;
    -khtml-user-select: none;
    -o-user-select: none;
    -moz-user-select: none;
    -moz-user-focus: ignore;
    -moz-user-input: disabled;
}
div.mcdropdownDisabled input {
    cursor: default;
}
div.mcdropdownDisabled a:hover, div.mcdropdownDisabled a:focus {
    background-position: 0 0;
    cursor: default;
}
/* 
    styles for the dropdown menu 
*/
 ul.mcdropdown_menu {
    display: none;
    margin: 0px;
    padding: 0px;
    list-style-type: none;
    /* float so we can calculate the size of the columns */
    float: left;
    clear: both;
    z-index: 10000;
    -khtml-user-select: none;
    -o-user-select: none;
    -moz-user-select: none;
    -moz-user-focus: ignore;
    -moz-user-input: disabled;
}
ul.mcdropdown_menu ul {
    display: none;
    font: 11px Arial, Helvetica,...

JavaScript

$(document).ready(function () {
    $("#category").mcDropdown("#categorymenu");
    $("#category_1").mcDropdown("#categorymenu");
});