I got some demand from the community to provide builds of Python for browser, Node, and WASI. We don’t provide official, yet. I extended my repo GitHub - tiran/cpython-wasm-test: Test CPython WebAssembly builds with Emscripten SDK of nightly tests with builds from release tags.
You can download 3.11.0b5 builds from the release page. The repo also contains some instructions how to run the builds. The release bundles are self-contained and come with a subset of Python’s stdlib.