Vector tiles demo
In this repo you can see a static map of Milan, Italy, working without external services (except the CDN for the Javascript libraries, also optional).
Also see the article with the technical explanation
Usage
python3 -m http.server, then visit http://127.0.0.1:8000/index_mapgl.html
Note that some parts of the map may fail to render, that's because they contain characters outside the 0-255 codepoint range and those font files are not included to reduce the repository size