Leaflet thematic polygon map, with hover info, tabs to display time periods, and data drawn from GeoJSON file.

https://handsondataviz.github.io/leaflet-map-polygon-tabs

• Map design by @alvinschang Connecticut Mirror http:https://ctmirror.org
• Code improvements by @ilyankou

• Hover over polygon to view info; or tap polygon in mobile devices
• Click tabs or keyboard arrow keys to flip through data series (such as decades or categories)
• Easily create and upload data by joining a CSV table to a GeoJSON map boundary in MapShaper.org

• Automated legend displays only numerical ranges, not text values
• This version displays only one GeoJSON map boundary

• see Leaflet templates section of Hands-On Data Visualization book https://handsondataviz.org