I developed some CSS for responsive YouTube videos that you can find here:
https://jsfiddle.net/crtqar0y/9/
With a checkbox to display the video in a responsive way, you could append the class responsive to the fr-video span, and insert an additional child span for styling, with the iframe inside.
Thoughts?
Thanks for the suggestion, Sean. Most likely we'll add an option instead of using a checkbox in the video popup.
One last thing, and you may already know this, but in order to get that to work, the iframe's height and width have to be attributes rather than inline styles. Cheers!
This is more like a feature-request, therefore I marked it accordingly and will close it for now.
We've just put together a public roadmap with the most popular features. 馃槏 There you can vote your favorite one, provide feedback or make new suggestions: https://wysiwyg-editor-roadmap.froala.com/public.