To position an element absolutely (that is, by coordinates), you need to specify the element's coordinates as well as a reference from where to position it.
absolute-content module, you can make this dependency obvious by declaring one element as the
positioning reference, and another as the positioned content.
More importantly, you can absolutely or statically position elements as needed, based on device state. Because often times, you may want elements placed on top of each other on large displays, but below one another on smaller devices.