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WebAssembly code can talk to the rest of your JS (and therefore asm.js) code, right?

So PyPy.js runs Python in the browser via asm.js:

Livebook uses PyPy.js to make a Jupyter-like notebook that runs entirely in the browser, and includes pandas:

And random plug for Observable in case you haven't seen it, a Jupyter-like Javascript environment, completely in the browser:

As historical background: Python was one of the early emscripten asm.js experiments: https://github.com/kripken/emscripten/tree/master/tests/pyth...

Nuitka can compile Python to LLVM IR, which can be compiled into WASM, I think.

which answers my other question, so it's canvas?

The frontend is actually pure JS/HTML - the WebAssembly part is just the data engine, and runs in a WebWorker for CPU isolation.

Hypergrid is a canvas-based renderer, yes.