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 id='one'>one</div>
<div id='two'>two</div>
<div id='three'>three</div>
<div id='four'>four</div>
<div id='five'>five</div>

CSS

.box {
    width: 50px;
    height: 50px;
    border: 2px dashed orange;
}

JavaScript

var divs = document.getElementsByTagName('div');

$(divs).addClass('box');