If I hover the mouse on the legend icons I get a pop up with the corresponding OSM tag (access=yes, access=private ecc.). It would be cool if was the same for the icons on the left, so phone=, opening_hours=, check_date= ecc. maybe it could help new users getting curious about OSM tags?
Suggested here: https://community.openstreetmap.org/t/openaedmap-a-map-of-automatic-external-defibrillators/100952/8