I’m making an online game. I want to have a quit button on the main menu so that if the player clicks it the browser window be closed. Could you please help me and give the code for it?
That can’t be enforced by the UnityWebplayer. Usually people uses tabs nowadays, so closing a window without permission is something which lays outside of what the webplayer should be able to do.
However, if the user allows a webpage to close a window via javascript you can do it that way. Take a look at Application.ExternalEval and for more information on window.close see this page