Supposedly, the Marklar editor will accept raw html. But when I try to embed a video with iframe, it does not seem to work.
For example, this does not work:
<iframe src="https://app.box.com/embed/s/6i7fofilvtkcy9vvhqg9i6kpv6y6dlwl?sortColumn=date&view=list" width="800" height="550" frameborder="0" allowfullscreen webkitallowfullscreen msallowfullscreen></iframe>
If placed in the Marklar editor. However, it work if inserted as HTML into the Atto editor.