Note for tester - if you have customised your tinymce toolbar - restore it to the default toolbar before applying this patch. Using clean and standard in supported browsers Look at the icons/toolbars for TinyMCE, Filemanager, Filepicker and the EditPDF tool in Assignment submission grading. Ensure they look right Ignore editor widths etc, these have already been raised and are being worked on already. To test MDL-42620 in this issue too: In clean and standard themes, using supported browsers: Open a page with a filemanager Check the selected view's button's background looks slightly darker than the hover state Hover over the button Check that it gets lighter Select another view button and repeat above steps