[SigmundA]

Not SVG, its Mapbox Vector tile format which is like Geojson coded in protobuf it is then rendered to raster in the browser using webgl typically.

https://github.com/mapbox/vector-tile-spec/tree/master/2.0

SVG is an XML based format that browsers render naitively, completely different.

https://en.wikipedia.org/wiki/SVG