Autofil
Autofill can be used by users to save and re-enter information that they commonly fill out on web pages. Some common data includes: Location information, Payment details, Account information.
Android WebView
Android
Android WebView relies on the Android autofill framework. Users can choose a default auto fill service, which will be responsible for responding to autofill requests. Android WebView is responsible for detecting what fields in a web page may need to be auto filled, and is responsible for sending autofill requests to the autofill framework.
WebView2
Windows
Will autofill any fields that Microsoft Edge will, such as names, street, email addresses, phone numbers, passwords, etc. Developers can control this in their application using the CoreWebView2Settings.IsGeneralAutofillEnabled and CoreWebView2Settings.IsPasswordAutosaveEnabled properties.