У вашего броузера проблема в совместимости с HTML5
https://media.ccc.de/v/froscon2017-2035-rendering_map_data_with_mapnik_and_python
Mapnik is an open source toolkit for rendering maps, probably best known for producing the map tiles for openstreetmap.org. It provides a stylesheet language, input handlers for different GIS data formats, and C++ and Python API bindings.
Hartmut Holzgraefe