JSFiddle - React, Tailwind, and code Playground
HTML
<div id="wpbody-content">
<div class="wrap">
<h1>All Forms <a class="title-action" href="">Add New</a></h1>
</div>
</div>
JavaScript
var elt = document.getElementById("wpbody-content")
.getElementsByClassName("wrap")[0].getElementsByTagName('h1')[0];
elt.innerHTML = 'Candidate Application Forms ' + elt.children[0].outerHTML;