JSFiddle - React, Tailwind, and code Playground

HTML

<div id="a">
</div>

<button id="add">Add to Div</button>

CSS

div {
    background-color: black;
}

span {
    background-color: red;
}

JavaScript

$("#a").bind("DOMSubtreeModified", function() {
    alert("tree changed");
});


$("#add").click(function() {
    $("#a").append("<span>hey there</span>");
});