Youtube fullscreen mode not working with embedded IFRAME

Plone 5.1RC1:

I created a new page and inserted the embedding code for you Youtube video as-in into TinyMCE ("Insert Media").
The video plays properly but the fullscreen mode is not working ("full screen is unavailable"). The issue occurs on Mac and Linux on all browers...what is the issue here?


The video itself can define that in its metadata on YouTube-side.

Can you reproduce the behaviour with other videos?

Yes, reproducible with 4 different YT videos

You need to add "allowfullscreen" to the list of allowed attributes in HTML filtering. Other TinyMCE will filter them out.

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