JSFiddle - React, Tailwind, and code Playground

HTML

<table id="divOutputWindow">
<tr><td>x</td></tr>

<tr><td>x</td></tr>
<tr><td>x</td></tr><tr><td>x</td></tr><tr><td>x</td></tr>
</table>

CSS

.purple {
    background-color:purple;
}

JavaScript

$(document).ready(function() {
            setInterval(findYellow, 1000);
            function findYellow() {
                $('#divOutputWindow').find('tr').each(function() {
                var $this = $(this);
                $this.toggleClass('purple');
                })
            }
        });