JSFiddle - React, Tailwind, and code Playground

HTML

Current URL: <div id="current-url"></div>
<iframe src="https://fiddle.jshell.net/L3vyvq7s/2/show/"></iframe>

JavaScript

const $currentUrl = document.querySelector('#current-url');
$currentUrl.textContent = location.href;

window.addEventListener('message', event => {
  history.pushState(null, null, event.data);
  $currentUrl.textContent = event.data;
});