Create a new assignment with file submissions enabled. As a student, submit a multi-page file (of a format that can be converted to PDF). As a teacher, annotate the submission with several comments on different pages. Make sure the comments collapse to a marker icon after being added. Make sure comments are expanded briefly on mouseover (as long as the 'Comments' or 'Select' tool is selected) and collapse again on mouseout. Make sure comments are expanded on click (with any tool selected) for as long as they are being edited. Make sure comments collapse again on losing focus after being edited. Click the 'Expand/collapse all comments' button and make sure all comments are expanded, and stay expanded. Click the 'Expand/collapse all comments' button again and make sure all comments collapse again. Check that tabbing between comments still works, and that the each comment expands on focus. Check that the comment menu items (e.g. quicklist) all function as expected. Check that the 'Search comments' function works as expected, and that comments are expanded and focused when selected. Add a few annotations of other types and save the changes. Release the feedback. As a student, view the annotated PDF using the online viewer. Make sure all comments are collapsed to a marker icon when the viewer loads. Make sure comments are expanded briefly on mouseover and collapse again on mouseout. Make sure comments are expanded on click for as long as they have focus. Make sure comments collapse again on losing focus. Click the 'Expand/collapse all comments' button and make sure all comments are expanded, and stay expanded. Click the 'Expand/collapse all comments' button again and make sure all comments collapse again. Check that tabbing between comments still works, and that the each comment expands on focus. Check that the 'Search comments' function works as expected, and that comments are expanded and focused when selected. Download the annotated PDF and open it offline. Make sure all comments are represented by markers containing an index in the format: {pagenumber}.{commentnumber} Make sure all the comments have been appended to the end of the document in full, along with their correct indices. Check that the markers link to the correct comments and vice-versa.