JSFiddle - React, Tailwind, and code Playground

HTML

<table>
    <tr id="row1">
        <td>a
        </td>
        <td>b
        </td>
        <td>c
        </td>
    </tr>
    <tr id="row2">
        <td>a2
        </td>
        <td>b2
        </td>
        <td>c2
        </td>
    </tr>
</table>
<button id="b1">click here</button>

JavaScript

$(document).ready(function(){
    $('#b1').on('click',function(){
        var v=$('</tr><tr id="row11" colspan=3><td>text</td>'); 
        $('#row1').after(v);});
    });