JSFiddle - React, Tailwind, and code Playground

HTML

<html>
    <body>i'm a body</body>
    <p>i'm out of body</p>
</html>

JavaScript

$(document).ready(function() {
    $("body").append("<div id='container'>I'm a body-container</div>");
    $("body").append("<div id='footer'>i'm testing!</div>");
}