Testing requirements: Login as admin Go to Site administration -> Development -> Debugging and set: Debug messages to "DEVELOPER" Display debug messages to true One course in topics format with at least 2 sections and 2 activities on each section. Go into the course as admin and display the course index (you probably need to close the drawer first) Test 1: console Open the browser console (F12 in chrome), refresh the page, and wait until the page is loaded completely. Check a console log with the message: Debug module "M.reactive" loaded. Check a console log with the message: Registering new reactive instance "M.reactive.CourseEditorXXX" (where "XXX" is the id of the current course) Execute the following commend (NOTE: XXX is the id of the current course) : M.reactive.CourseEditorXXX.highlight = true; Check the course index and the course content elements are highlighted with a thick border. Execute: M.reactive.CourseEditorXXX.highlight = false; Check the course index and the course content are not highlighted anymore. Execute: M.reactive.CourseEditorXXX.stateData Check the console shows an object with cm, course, and section attributes. Test 2: debug panel Scroll to the page footer. Check that "Reactive instances" is present in the footer. Check a button "CourseEditorXXX" is present near "reactive instances"  (NOTE: XXX is the id of the current course) Click on the "CourseEditorXXX" button Check a panel with a "CourseEditorXXX" title opens below the button Check a JSON structure is present in the State data textarea Check the state data has "course", "section" and "cm" attributes on the first level. Click on "Unpin" button Check the panel is unpinned from the footer Check you can drag the panel around the page Scroll to the top of the page and click on "Highlight OFF" button Check the course index and the course content elements are highlighted with a thick border. Click on "Highlight ON" button Check the course index and the course content are not highlighted anymore. Find "sectionlist" array in the State data text area, swap the first two values and click on the "save" button. Check the first two sections on both course index and course section swaps Check that State events log now have some content like "transaction:start", "course.sectionlist:updated"...