You will see this message in your browser if your browser has JD disabled => you have to enable it in your browser. If your browser has JS enabled you will not see it because it is wrapped with
Ah! Is this message only for testing if JS is enabled? And if I don’t see it in my browser, that means it’s ok and all I have to do is to delete it from my index.html?
Leave it in your code because if some user uses your app with JS disabled, the message will help them.
Now I understand. Thank you very much!