JSFiddle - React, Tailwind, and code Playground

HTML

<input type="text" id="myInput" />
<div id="myOutput"></div>

JavaScript

var myInput = document.getElementById('myInput');
var myOutput = document.getElementById('myOutput');

var myEvent = "onkeyup";

myInput[myEvent] = function(){

	myOutput.innerHTML = myInput.value;

};