JSFiddle - React, Tailwind, and code Playground

HTML

<link rel="stylesheet" href="http://ajax.googleapis.com/ajax/libs/jqueryui/1.8.4/themes/ui-lightness/jquery-ui.css">
<table>
    <tr><td>1</td><td>2</td><td>3</td></tr>
    <tr><td>1</td><td>2</td><td>3</td></tr>
    <tr><td>1</td><td>2</td><td>3</td></tr>
</table>

CSS

.special {
    color: red;
}

JavaScript

$('tr > td:nth-child(3)').addClass('special');