JSFiddle - React, Tailwind, and code Playground

HTML

<input type="button"
onclick="$('<tr><td >df</td></tr>').appendTo('#CT');" value="fff">
<table>   
    <tr id="CT4"><td></td></tr>
    <tr id="CT5"><td>5</td></tr>
    <tr id="CT6"><td>6</td></tr>
</table>

JavaScript

$('<td>9</td>').appendTo('#CT5');