I'm using this markdown-xblock in my OpenEdx. I did find one issue when using iframe. The whole content of that particular component does not load in MFE LMS if i add an iframe
in the markdown.
Lets say i embed a youtube video
<iframe width="560" height="315" src="https://www.youtube.com/embed/jZGjzngtdRc" title="YouTube video player" frameborder="0" allow="accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture" allowfullscreen></iframe>
The component does not load in MFE LMS, but loads in the legacy LMS.
I'm not entirely sure if this is occurring due to OpenEdx or this X-block.