This is the official WebAssembly "language" specification.
It uses Sphinx. To install that:
pip install sphinx
To make HTML (result in _build/html):
make html
To make PDF (result in _build/latex, requires LaTeX):
make pdf
To make all:
make all
Finally, to make all and update webassembly.github.io/spec with it:
make publish
Please make sure to only use that once a change has approval.