The coordinates display element shows your mouse position in map coordinates.
YAML-Definition:
tooltip: 'coordinates display' # text to use as tooltip
numDigits: 2                   # the number of digits each coordinate shall have when being rendered, default 2
target: ~                      # id of Map element to query
label: true                    # true/false to label coordinates display, default is false
empty: 'x= - y= -'             # show the following text, if the mouse is not on the map
prefix: 'x= '                  # show prefix before x-coordinate
separator: ' y= '              # show separator before y-coordinate
None.
None.