z property
The DOMPoint interface's
z property specifies the depth coordinate of a point in
space.
Unless transforms have changed the orientation, a z of 0 is
the plane of the screen, with positive values extending outward toward the
user from the
screen, and negative values receding into the distance behind the screen.
Implementation
external double get z;
      
      set
      z
      (num value) 
      
    
    
    
Implementation
external set z(num value);