After a pleasant email chat with another OSM user, I’m saving here three useful custom URLs to use as a background layer when editing maps on OpenStreetMap website with integrated iD editor. Just click on the “Background Settings” icon in the right vertical menu, scroll down the list of available backgrounds and choose the last item labeled “Custom”, click on the three dots on the right, copy and paste one of the custom URLs you can find below and finally click on the “OK” button to save changes and start using the newly added map layer.

1) True Ortofoto EagleFVG 2020

http://irdat-ortofoto.regione.fvg.it/geoserver/ows?FORMAT=image/png&TRANSPARENT=TRUE&VERSION=1.3.0&SERVICE=WMS&REQUEST=GetMap&LAYERS=ortofoto:trueorto_FVG_1720&STYLES=&CRS={https://wiki.openstreetmap.org/wiki/Tag:proj}&WIDTH={width}&HEIGHT={height}&BBOX={bbox}

2) Vector CTRN (Carta Tecnica Regionale Numerica) 1:5000

http://irdat-ortofoto.regione.fvg.it/geoserver/ows?FORMAT=image/png&TRANSPARENT=TRUE&VERSION=1.3.0&SERVICE=WMS&REQUEST=GetMap&LAYERS=ortofoto:CTRN5000&STYLES=&CRS={https://wiki.openstreetmap.org/wiki/Tag:proj}&WIDTH={width}&HEIGHT={height}&BBOX={bbox}

3) Hillshade

http://irdat-ortofoto.regione.fvg.it/geoserver/ows?FORMAT=image/png&TRANSPARENT=TRUE&VERSION=1.3.0&SERVICE=WMS&REQUEST=GetMap&LAYERS=ortofoto:Hillshade&STYLES=&CRS={https://wiki.openstreetmap.org/wiki/Tag:proj}&WIDTH={width}&HEIGHT={height}&BBOX={bbox}