JSFiddle - React, Tailwind, and code Playground

HTML

<table border="1">
    <tr>
        <td>1</td><td>1</td>
    </tr>
</table>
<input type="button" value="Add" />

JavaScript

var html;
setInterval(function() {
    var table = $('table');
    if($('table').html() != html){
        alert('Changed!');
        html = $('table').html();
    }
}, 500);

$('input').on('click', function(e){
    $('table').append('<tr><td>1</td><td>1</td></tr>');
});