JSFiddle - React, Tailwind, and code Playground

HTML

<div id="editable" contenteditable="true"></div>

CSS

#editable {
    width:100px;
    height:100px;
    border:1px #ccc solid;
}

JavaScript

document.getElementById("editable").onkeypress = function (){
    document.getElementById("editable").innerHTML = this.innerHTML.replace("this","that");
}