JSFiddle - React, Tailwind, and code Playground

HTML

<div id="s">STOP</div>

<div id="L1"></div>
<div id="L2"></div>
<div id="L3"></div>
<div id="L4"></div>
<div id="L5"></div>

JavaScript

v=setInterval(function(){for(i=0;i<6;i++){$("#L"+i).html(String.fromCharCode(Math.floor(Math.random()*26+65)))};},500);$("#s").click(function(){clearInterval(v);});