JSFiddle - React, Tailwind, and code Playground

HTML

<div id=test>0.0</div>

JavaScript

var xVal = 0;
var xElement = null;

    xElement = document.getElementById("test");
    var Interval = window.setInterval(startWatch, 1);
    

function startWatch(){
 
    xVal += 1;
    xElement.innerHTML = xVal;
    
}