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							- class position {
 
-     get name() {
 
-         throw "This is abstract getter.";
 
-     }
 
-     get top_css() {
 
-         return "auto";
 
-     }
 
-     get bottom_css() {
 
-         return "auto";
 
-     }
 
-     get left_css() {
 
-         return "auto";
 
-     }
 
-     get right_css() {
 
-         return "auto";
 
-     }
 
- }
 
- class place_top extends position {
 
-     get name() {
 
-         return "top";
 
-     }
 
-     get top_css() {
 
-         return "0px";
 
-     }
 
- }
 
- class place_bottom extends position {
 
-     get name() {
 
-         return "bottom";
 
-     }
 
-     get bottom_css() {
 
-         return "0px";
 
-     }   
 
- }
 
- class place_left extends position {
 
-     get name() {
 
-         return "left";
 
-     }
 
-     get left_css() {
 
-         return "0px";
 
-     }
 
- }
 
- class place_right extends position {
 
-     get name() {
 
-         return "right";
 
-     }
 
-     get right_css() {
 
-         return "0px";
 
-     }
 
- }
 
- export { position, place_top, place_bottom, place_left, place_right };
 
 
  |