JSFiddle - React, Tailwind, and code Playground

by Paulpro

HTML

<div>
   <span id="tag"></span>
</div>

JavaScript

var i = 15;
function timer(){
   var div = document.getElementById("tag");
   i--;
   setInterval(function(){
      div.innerHTML = i；
      i--;
   },15000);
}

timer();