In URL: https://www.zabbix.com/documentation/3.0/manual/config/visualisation/maps/map
have some isses:
In table of element properties:
"Icon (default) Icon to be used." this field does not exists

The image: manual:config:visualisation:map_element.png|
is from old Zabbix layout
The ICON box apear different in Zabbix 3 alpha 6

This text need to be improved because the map eddition now is on same menu of map visualization
"Element-specific URLs can be set for the element. These will be displayed as links when a user clicks on the element in the monitoring section"

I think some liked:
"Element-specific URLs can be set for the element. These will be displayed as links when a user clicks on the element in viualization mode of map"

I think the correctly for this text for table with element properties:
"Macros that can be used in map URLs".
Can be betther:
"Macros that can be used in element URLs"