As timhunt has pointed out in MDL-64591, the assignment grading panel makes use of the Embedded layout. The embedded layout is intended for iframes.

If the assign grading page is currently claiming to be an 'embedded' layout, then it is cheating. The embedded layout is documented as being for things in iframes. I know what the assign grading page is trying to do, but using embedded layout to achieve it is definitely a hack.

We need to look at what our options here, but they potentially include:

1. use a different layout
2. create a new layout for this kind of interface
3. update the documentation to state that the embedded layout may be used for fullscreen interfaces