We make extensive use of youtube videos in our training material. We use "object" elements to define these videos and their attributes in the DITA XML. As it stands our browser-based authors cannot create these, at which point they have to either hand work off to a desktop-based author or switch tools. Please make it possible to create this formation:
<object width="800" data="https://www.youtube.com/embed/9nVuhtGSbZc" outputclass="iframe">
<param name="allowfullscreen" />
</object>