JSFiddle - React, Tailwind, and code Playground

by felipero7

HTML

<div id="contador"></div>
<div id="content_alert">
  <span>Teste SetTimeOut</span>
<div>

CSS

#content_alert{
  border:2px solid #084884;
  border-radius:4px;
  background: #0077e5;
  padding:10px;
  color:#FFF;
  font-size:18px;
  float:left;
  display:none;
  position:fixed;
  top:25%;
  left:25%;
}

JavaScript

var count = 10;
var i = setInterval(function(){
  document.getElementById('contador').innerText = --count;
}, 1000);

setTimeout(function(){
  
  clearInterval(i);
}, 10000);