JSFiddle - React, Tailwind, and code Playground

HTML

<div id="divOutputWindow">
    <table>
        <tr>
            <td>foo</td>
            <td>bar</td>
        </tr>
        <tr>
            <td>hello</td>
            <td>world</td>
        </tr>
        <tr>
            <td>lazy</td>
            <td>fox</td>
        </tr>
    </table>
</div>

CSS

#divOutputWindow tr {
    background-color: white;
}

#divOutputWindow tr.highlighted {
    background-color: purple;
}

JavaScript

setInterval(findYellow, 1000);
function findYellow() {
    $('#divOutputWindow').find('tr').each(function() {
        $(this).toggleClass('highlighted');
    });
}