JSFiddle - React, Tailwind, and code Playground

HTML

<html xmlns="http://www.w3.org/1999/xhtml">
<head>
    <title>Test 4</title>
    <script type="text/javascript" src="http://ajax.googleapis.com/ajax/libs/jquery/1.3/jquery.min.js"></script>
</head>
<body>
    <div>
        <span>1</span><span>2</span><span>3</span><span>5</span>
    </div>

    <script type="text/javascript">
        $(function(){
            $("<span>2</span>").insertBefore($("div :last-child"));
        });
    </script>
</body>
</html>