My first app's bug? Alert box is not showing

Question

Please tell me why alert box is not showing in my app and not only that prompt box is also gone so please tell me what should I do to fix it please give me only positive response plzz
Like sololearn uses webview right then how is it possible that we both use webview but it shows alert box at their only???? How???
Here is the the app link plzz help me!!:
https://we.tl/t-l2XBMUJqWf

Answer 1

maybe the javascript is disabled.

https://developer.android.com/guide/webapps/webview
scroll down bit you'll see section about javascript

Answer 2

But it's in sketctware app and not working plzz tell me what to do now?