when viewing any of the moodle site from a mobile device (like I do at the moment for instance) with disabled CSS, every page starts with very long nested lists of the header menu items (About, News, Support, Community, ...). It is impossible to skip this menu to the page content. user has to scroll many lines manually.
This may be accesibility issue. I propose either putting the menu at the bottom of the page (rendering it at the top by css positioning) or providing a link 'Skip main menu' or similar.