Requirement You'd need the  WAVE browser extension  for this test Test 1& Test 2 Log in as admin Create a course and enrol 2 students in it Create a quiz, an assignment and a forum in the course Go to the grade book (Grades) of the course and access to the "Single view" tab Select a student from the 'Select user...' drop-down menu View source of the page (usually ctrl+u) Copy the source Visit  https://validator.w3.org/nu/ Set the check by field to 'text input' and replace the content of the text editor with what you copied on step #7 Press the 'check' button Press the 'message filtering' button Verify  that you don't see any errors Repeat the test, but at step 5, select an activity from the 'Select grade item' drop-down menu Test 3 & Test 4 Log in as admin and visit the course you created at test 1 Go to the grade book (Grades) and access to the "Single view" tab Select a student from the 'Select user...' drop-down menu Press the WAVE icon on your browser Verify that you do not see any: 'Empty form label' error 'Multiple form labels' error 'Empty table header' error Repeat the test, but at step 3, select an activity from the 'Select grade item' drop-down menu