Commands should support undo whenever possible
History -> back, forward, reopen Tabs -> open tab, close tab Bookmarks -> bookmark Clipboard -> copy, paste, cut Downloads -> download (target), open download ??? page commands? Find -> find (text) View -> zoom (in|out)
Play (music|video), skip, next, previous, (increase|decrease) volume Links -> open (target), download (target) Forums/social media -> view comments, like, share, next post, previous post, open link, search Email -> next, previous, next thread, previous thread, forward, reply, search