Test speech recognition with Angular.
https://www.talater.com/annyang/
Grammars: https://en.wikipedia.org/wiki/JSGF https://en.wikipedia.org/wiki/Speech_Recognition_Grammar_Specification
Client speech recognition: https://github.com/cmusphinx CMUSphinx
https://stackoverflow.com/questions/7433801/grammar-in-google-web-speech-api
Jean-Louis GUENEGO @2019