You check this here: https://pltytus.usermd.net/swnt/
You can also clone this repository and run this on your local machine, but remember, notifications requiers HTTPS protocol with valid certificate, you might need to set your browser to ignore certificate erros. You can use one of the commands below without settings this permanently:
chrome.exe --ignore-certificate-errors --unsafely-treat-insecure-origin-as-secure
opera.exe --ignore-certificate-errors
firefox.exe --ignore-certificate-errors