The attic window is transformed into a balcony.
In the window file for 3 angles of the roof slope (50 55 60 g.) It is in this range that the window will work correctly. If the angle is less the person will touch the upper leaf with the head if the angle is greater he simply will not be able to reach the top flap to close it.
Video demonstration of this window.
https://www.instagram.com/p/BcInfgJA60L/?taken-by=architect_sochi