Leaflet.annotate aims to transform the BSD-Licensed web mapping library Leaflet into a semi-automatic, semantic authoring environment for creators of geographic web maps. The plugin extends the options for the LeafletJS Standard API elements Marker, CircleMarker, Popup, ImageOverlay and GeoJSON so you can publish these map elements in HTML semantically annotated ‐ and therewith machine readable web maps. While there is quite some effort already around the development of new geospatial data catalogs (which are awesome) this plugin turns the focus onto geographic web maps. Acknowleding that, de-facto, some maps already are data catalogs themselves, they are just not that well represented in HTML so that other programs can extract and re-use the information people collect in them.

https://github.com/mukil/Leaflet.annotate