JSFiddle - React, Tailwind, and code Playground

HTML

<div>
    <span>click me</span>
</div>
<div>
    <span>no, click me</span>
</div>
<div>
    <span>whatever</span>
</div>

JavaScript

HTMLDivElement.prototype.__appendChild = HTMLDivElement.prototype.appendChild;
HTMLDivElement.prototype.appendChild = function(){
    alert('new item added');
    HTMLDivElement.prototype.__appendChild.apply(this, arguments); 
}

$(document).ready(function(){
    $('div').click(function(){
        $(this).append('<span>extra node!</span>');
    });
});