Create an assignment in a course with at least one student. As a student, submit to the assignment. As a teacher, grade the submission and annotate a few comments. Tab around the grading page and verify that: all comments can be focused (in the correct order), each comment's menu can be focused (after the comment itself), all elements display a focus outline when focused, all of the above also works as expected when reverse (Shift) tabbing. Test with both Clean and Boost themes, and in all supported browsers.