leaflet-tilelayer-mask
Leaflet-tilelayer-mask is a plugin for leaflet 0.7.3 to add mask effect to TileLayer.
https://github.com/frogcat/leaflet-tilelayer-mask
retroscope
Demonstrations for leaflet-tilelayer-mask. Historical map with mask effect on satellite map.
Tokyo, Japan
http://frogcat.github.io/retroscope/