Neil Kronlage

function\* generators have a throw method

http://www.ecma-international.org/ecma-402/1.0/

Window.onbeforeunload event type should be BeforeUnloadEvent

2

The http://www.javascripture.com/Window#onbeforeunload event should take a BeforeUnloadEvent in the listener: http://www.whatwg.org/specs/web-apps/current-work/multipage/history.html#the-beforeunloadevent-interface