JSFiddle - React, Tailwind, and code Playground

HTML

<script src="https://cdnjs.cloudflare.com/ajax/libs/mark.js/7.0.0/mark.min.js"></script>
<body>
  <p>hello i am rob</p>
</body>

JavaScript

var context = document.querySelector("body");
var instance = new Mark(context);
var paragraph = document.getElementsByTagName("p")[0].innerHTML;
instance.mark(paragraph);