Exit or Close Button?

Hi Adam, on mobile in particular, but even on the desktop I try and steer clients away from popups.  If the course is inline then when you click the "Save & Exit" button or equivalent, the LMS just takes you back to the appropriate page, most often the course list page.

Using a popup model still works, the scorm API (provided by the LMS) completes its exit routine, redirects/refreshes the opener and closes the popup window.  Popups just aren't a very nice experience on mobile in my experience, so I try to avoid them.  They're only really useful when using development tools that aren't responsive and require a fixed/optimal stage size.  Popups then allow you to open a window sized appropriately which can give a nicer experience on the desktop.

Whether on mobile or on the desktop though I feel really strongly about supporting the user with screen elements that clearly explain what your options are.  The big 3 being next, back and exit (preferably "Save & Exit").  Particularly when you are working in sectors that don't do a lot of online training I find people get worried/frustrated if there isn't a clear safe way to save their session and resume later.  I also think it's pretty important from an accessibility point of view.