echo For security reasons, Chrome won't properly download data from a file// address. By running this python based webserver chrome testing will work. I think it requires Python 3+ to be installed, this might happen automatically when you setup the Emscripten stuff set CURPATH=%cd% cd .. call app_info_setup.bat :um, why does the emsdk_env.bat not fully work unless I'm in the emscripten dir? Whatever, we'll move there and then back cd %EMSCRIPTEN_ROOT% call emsdk_env.bat :Move back to original directory cd %CURPATH% emrun %APP_NAME%.html pause exit :Another method that could be used, using a python server start http://localhost:8000/%APP_NAME%.html echo Ctrl-Pause to kill the server python -m http.server --bind 127.0.0.1 8000 pause