I wonder which criteria make those nodes stand out from the others: - new nodes (but then IDs should be negative, not positive like in your example. It depends on how the JOSM file was generated. Was the data downloaded from the OSM server (positive IDs, IDs), or was the data created elsewhere and still has to be uploaded to OSM (negative IDs ?) ?)) - no tags so perhaps take a look at Pseudo Classes (:new, !:tagged) in https://josm.openstreetmap.de/wiki/Help/Styles/MapCSSImplementation to select those nodes and style them

I wonder which criteria make those nodes stand out from the others: - new nodes (but then IDs should be negative, not positive like in your example. It depends on how the JOSM file was generated. Was the data downloaded from the OSM server (positive IDs, or was the data created elsewhere and still has to be uploaded to OSM (negative IDs ?) - no tags so perhaps take a look at Pseudo Classes (:new, !:tagged) in https://josm.openstreetmap.de/wiki/Help/Styles/MapCSSImplementation to select those nodes and style them