Twice so far this semester I have lost 30 minutes or more of work by accidentally leaving a page (assignment or discussion description) before saving my work (or before copy/pasting my work into a word document, which I try to do so I don't lose the information!).
Why is there no "Are you sure you want to leave this page, you have unsaved data?" message?
I strongly suggest that Canvas have such a page, whether for faculty creating content or for students taking quizzes! Most programs (online or off) give the user a heads up when you start to leave a page with unsaved data!