Is important to test this issue in different browsers including (IE 8 and 10, Firefox and Chrome) in different OS (Windows, iOS and Linux) In browsers that supports SVG you can also try to zoom in and zoom out to check there is nothing strange. Browsers that does not supports SVG SHOULD display the .png icons, browsers that supports SVG SHOULD display the SVG icons The aim of this test is to check how the activity actions icons are displayed Go to a course with users and groups Enable editing mode Create an activity on it (is not important which one, is only to check the icons) Check how the icons are displayed. Refer to the attached screenshot above to see what to expect for each icon visually Try actions like hide/show or change the group visibility of the activity to see icons not displayed initially Disable javascript to check the non-JS icons like 'move' Zoom out (ctrl +) to the max on the course page and block header to see each svg icon scale up without pixelation except on ie8 and higher because it is showing the fallback png format