http://www.wykobi.com/ meets web assembly
you will need:
https://github.com/juj/emsdk at $EMSDK_DIR
https://github.com/ArashPartow/wykobi at $WYKOBI_DIR
follow emcc setup instructions here https://developer.mozilla.org/en-US/docs/WebAssembly/C_to_wasm
bash build.sh