Well.. I've done some research..... Offline event shows the page which is already opened or shows offline when user lost network while opening new page and online event can't be seen cuz it's a page not an app where u can constantly see pages opening and mssges coming at the same moment..... But showing the offline thing at the upper side of the site may indicate that users who r visiting the site aren't the one who lost connection with internet.. Here in this case, mangago is the one which lost it's connection to the internet (not sure)....... Well, I can be wrong cuz I haven't learned anything abt software....
Is mangago down?