JSFiddle - React, Tailwind, and code Playground

HTML

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"
        "http://www.w3.org/TR/html4/loose.dtd">

<html>

<head>

    <title>Test</title>
    <script type="text/javascript" src="nothing"></script>
</head>

<body>
<div id="fb-root"></div>
 <div class="fb-like" data-send="false"></div>
</body>

</html>

JavaScript

var fjs = $('script:first').get()[0];
var e = $('<script/>').attr({'async': true, 'src': '//connect.facebook.net/en_US/all.js#xfbml=1&appId=xxx'}).get(0);
fjs.parentNode.insertBefore(e, fjs);

/*var fjs = $('script:first');
$('<script/>').attr({'async': true, 'src': '//connect.facebook.net/en_US/all.js#xfbml=1&appId=xxx'}).insertBefore(fjs);*/