screenX property
      
      int
      get
      screenX
      
    
    
The Window.screenX read-only property returns the
horizontal distance, in CSS pixels, of the left border of the user's
browser viewport to
the left side of the screen.
Note: An alias of
screenXwas implemented across modern browsers in more recent times — Window.screenLeft. This was originally supported only in IE but was introduced everywhere due to popularity.
Implementation
external int get screenX;