JSFiddle - React, Tailwind, and code Playground

by QW01_01

HTML

<div class="red-block"></div>

CSS

.red-block{
    width:100px;
    height:100px;
    background-color:red;
    display:none;
}

JavaScript

if(!localStorage['num-visit'])
    localStorage['num-visit'] = 1;
var numVisit = 0;
localStorage['num-visit'] = numVisit = parseInt(localStorage['num-visit']) + 1;

if(numVisit > 3)
    document.getElementsByClassName('red-block')[0].style.display = 'block';