JSFiddle - React, Tailwind, and code Playground

HTML

<div>
    <script type="text/javascript" src="js/embed.js"></script>
</div>

JavaScript

var parent,
    i = 0,
    scripts = document.scripts,
    newDiv =document.createElement('div');

newDiv.innerHTML = "<b>This is the new div</b>";

for (var i = 0; i < scripts.length; i++) {
    if (scripts[i].getAttribute('src') === 'js/embed.js') {
        parent = scripts[i].parentNode;
        parent.parentNode.insertBefore(newDiv, parent)
    }
}