code/_onclick/hud/map_popups.dm
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/obj/screen/map_view | A screen object, which acts as a container for turfs and other things you want to show on the map, which you usually attach to "vis_contents". |
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/obj/screen/background | A generic background object. It is also implicitly used to allocate a rectangle on the map, which will be used for auto-scaling the map. |