Problem/Motivation
Embedding a video as media remote_video entity does not allow Fullscreen for the video. On the inner frame it says allowfullscreen=""
To allow fullscreen, it would have to sayallowfullscreen="allowfullscreen"
I cannot find how one would influence this, this must have to do with the Oembed implementation.
Filed as a bug report since Fullscreen is a basic feature IMHO.
Proposed resolution
For the maximum cross-browser compatibility copy youtube and add allowfullscreen allow="fullscreen" to the iframe tag.
This aligns with the iframe documentation - https://developer.mozilla.org/en-US/docs/Web/HTML/Element/iframe
Remaining tasks
User interface changes
remote video embeds now are allowed to go fullscreen.
API changes
None
Data model changes
None
Release notes snippet
N/a