JSFiddle - React, Tailwind, and code Playground

HTML

<div class="hidden content-wrapper">
<h1>
Data loaded
</h1>
  <div class="content">
  Data loaded
  </div>
</div>

CSS

.hidden{
  display: none;
}

JavaScript

$(function() {
  // Put this piece of code inside of your "main" html file and it will catch the event
  $('.content-wrapper').on('content:loaded', function() {
    $(this).show();
  });

	// In your HTML page that you load, fire this in the $(function(){}) code
  $('.content').trigger('content:loaded');
});