Actually all of the user-hostile behavior that window.alert and window.confirm used to have has been improved in modern browsers. A StackOverflow post from 2010 is perhaps not the best resource for this information.
For instance: https://developers.google.com/web/updates/2018/01/nic64#window-alert
For simple use-cases, window.confirm is a cheap and easy solution that is guaranteed to be accessible and consistent with the browser UI.
So is there a good way to use window.confirm with Elm?