Codepen dashboard doesn't display content in iframe

Question

I created a pen, for example this , which contains frames. Everything is correct inside the pen, but when I go to the codepen toolbar, it does not display the contents inside the iframe - you can see here here - And I don’t know why. Maybe you know what it depends on? Thank.

<div class="embed-responsive embed-responsive-16by9">
  <iframe class="embed-responsive-item" src="https://www.youtube.com/embed/mlOiXMvMaZo" allowfullscreen></iframe> 
</div>

Answer 1

You may have already found your answer, but if I understand the question correctly, it displays correctly in Chrome when I look at your dashbaord:

Perhaps you need to clear your browser cache?

Hope this helps.