Ironically, in Toronto, not every bedroom is required to have a window [1].
[1] BCC Ruling No. 14-03-1366: https://web.archive.org/web/20210422142050/http://www.mah.go...
[1] BCC Ruling No. 14-03-1366: https://web.archive.org/web/20210422142050/http://www.mah.go...
In Italy a room, any room for residential use, not only needs a window, but the window(s) surface must be at least 1/8 or in some cases 1/12 of the floor surface of that room, a windowless room can only be a bathroom (with a compulsory exhaust fan) or a closet/corridor/storage/utility room.
But this comes not from fire related laws, but rather from minimal health requirements (natural light, ventilation).