JSFiddle - React, Tailwind, and code Playground

HTML

<script src="http://ajax.microsoft.com/ajax/jquery.validate/1.7/jquery.validate.js"></script>
<link rel="stylesheet" href="http://ajax.googleapis.com/ajax/libs/jqueryui/1.8.2/themes/ui-lightness/jquery-ui.css">
<div class="red"></div>
<div class="green"></div>
<div class="blue"></div>

<div class="apple"></div>

CSS

div {
    margin: 10px;
    color: blue;
    cursor: pointer;
}

JavaScript

var onlyColorDivs = $('div.red, div.green, div.blue');

alert( "there were " + onlyColorDivs.length + " matches.");