JSFiddle - React, Tailwind, and code Playground

HTML

<span>abc<br></span>
<a href="#">link</a>

JavaScript

document.getElementsByTagName("a")[0].onclick = function() {
    var span = document.getElementsByTagName("span")[0].cloneNode(true);
    this.parentNode.insertBefore(span, this);
    alert("I have insertedBefore, I may do it again.");
    return false;
};