JSFiddle - React, Tailwind, and code Playground

HTML

<h2 id="counter"></h2>

JavaScript

var el = document.getElementById('counter'),
    timer = 0;

var interval = setInterval(function () {
    timer += 10;
    el.innerHTML = timer;

    if (timer >= 1000) {
        clearInterval(interval);
    }
}, 10);