My favorite simple webserver (which is what I would recommend for checking out this example) is the built-in python simple webserver (Though any webserver will do).
python -m http.server
python -m SimpleHTTPServer
Alternatively, you can still just use a browser, but due to CORS you'll probably need to disable unique origins for file:///
see this. It has a small security risk, but might be more convenient than the python server.