JSFiddle - React, Tailwind, and code Playground

HTML

<div id=test>0.0</div>

JavaScript

var xElement = null;
var startTime = new Date();

xElement = document.getElementById("test");
var Interval = window.setInterval(startWatch, 17);
    

function startWatch(){
     var currentTime = new Date();
     xElement.innerHTML = currentTime - startTime;   
}