JSFiddle - React, Tailwind, and code Playground

HTML

<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.1.0/jquery.js"></script>
 <button id="top">Top Page</button>
 <iframe src="https://jsfiddle.net/r91bLb7r/2/show">
 </iframe>

CSS

html, body {
        height: 100%;
        margin: 0;
        padding: 0;
      }
      #top {
        
      }

JavaScript

$(document).ready(function () {
$( "#top" ).click(function() {
localStorage.setItem("parent", "one");
  alert('I am the top page');
});
});