JSFiddle - React, Tailwind, and code Playground

HTML

<div class="red"></div>
<div class="green"></div>
<div class="blue"></div>

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

CSS

.highlight { background-color: yellow; }

JavaScript

$(function() {
    $('div').each(function() {
        $(this).html($(this).attr('class'));
    }).filter('.red, .green, .blue').addClass('highlight');

});