Amazon.com : Super Squiggles Outline Markers: Shimmer Markers Set, 24 Colors Super Squiggles Markers, Double Line Self-Outline Metallic Pens for Scrapbook Photo Album, Gift Card Making, Easter Eggs, Art Crafts : Arts,
Fairly serious bug in the way marker click events are handled. · Issue #2619 · Leaflet/Leaflet · GitHub
Leaflet.markercluster | Marker Clustering plugin for Leaflet