"tile server", like OpenStreetMap's tile server in this example. If you just create a WLeafletMap,
(and give it a size), then you will be presented with an empty map. You can then add tile layers to the
WLeafletMap is not exhaustive in its support for Leaflet features. It supports a subset
out of the box. One of these features is markers, which come in two flavors: standard leaflet markers
(WLeafletMap::LeafletMarker) and widget markers (WLeafletMap::WidgetMarker).
Using a widget marker, you can place arbitrary widgets on the map. In this case, a WImage with
Leaflet itself is not bundled with Wt. Use the