In order to learn more about the auto-complete modes, please refer to https://www.htmlelements.com/demos/textbox/auto-complete/. As for the autocomplete=off of inner html elements, this is by design and will be there in any auto-complete mode of the inner input, because we do not use the native one. Our component displays a specific popup when the user types.
You can data bind our components using the dataSource property, however you cannot use the browser’s internal saved lists and this is on purpose for security reasons. If you need to use native auto-completition, you will have to use the native input tag as well.