JSFiddle - React, Tailwind, and code Playground

HTML

<table>
    <tr class="myClass">
        <td>Hi</td>
    </tr>
    <tr>
        <td>Bye</td>
    </tr>
</table>

JavaScript

window.onload=function(){
     $('.myClass td').css({'background-color': 'yellow'}); 
}