[Eframe] Allow relative position canvas

[lsh]

I'm using Eframe in a notebook/widget context and have noticed that the styling from the text agent forces a canvas to use the style position: absolute. Is there any information on why the styling is there and would it be possible to have an option that allowed other positioning?

[jprochazk]

This was fixed in #4561 - note that setting width/height through CSS is now required (otherwise you may run into #4699), but you should also be able to set position: relative on the canvas.