It lacks documentation but it's a fork that deploys RapydScript on the web, if you want to do a write up, it would be appreciated, as this question has been coming up frequently from other members.
As far as differences between node and javascript, the only difference is that "require" is not supported in the browser. The core logic of the compiler (parse.pyj, ast.pyj, output.pyj, utils.pyj, baselib.pyj) are completely environment-agnostic, the remaining tweaks are minor in nature (you basically create a wrapper for the browser).