JSFiddle - React, Tailwind, and code Playground

HTML

<div id="time"></div>

JavaScript

var timeElem = document.getElementById('time'), date = new Date();

function startTime() {
  date.setTime(Date.now());
  timeElem.innerHTML = date.getHours() + ':' + date.getMinutes() + ':' + date.getSeconds() + ':' + date.getMilliseconds();
  requestAnimationFrame(startTime);
}
requestAnimationFrame(startTime);