The documentation could use some work - I have scoured the website and FAQ but still don't understand how this works. Does it compile into javascript, or it is a Python interpreter for the browser? What subset of python does it support? What about libraries?

I recently encountered Pyodide[1], which compiles to wasm. This seems more interesting/useful, because one can imagine running scientific computations (for which Python is a good choice) in the browser without much of a performance hit.

[1]: https://github.com/iodide-project/pyodide