Requirement A course with a teacher and several students enrolled. Test Log in as a teacher in a course. Go to the course's participants page. Check the table of course participants Confirm that you see a checkbox on the column header of the table's first column. Let's call this the master checkbox. Confirm that without any item being selected on initial load, the " With selected users... " select box is rendered as disabled. Check the behaviour of the master checkbox. Confirm that: When it's ticked, all users become selected and its hidden label becomes " Deselect all " (you might wanna inspect using the dev tools of your browser) When everything's selected and you untick it, all users become deselected and its hidden label becomes " Select all " Check the effect of clicking of one or more checkboxes beside each attempt. Confirm that: When you tick all checkboxes, the master checkbox becomes ticked and its hidden label becomes " Deselect all " When all checkboxes are ticked and you untick at least one checkbox, the master checkbox becomes unticked and its hidden label becomes " Select all " Check the behaviour of the " With selected users... " select box. Confirm that: When at least one checkbox is selected, the select box is enabled. When there's no checkbox selected, the select box is disabled.