1. A "name" field on a dialog for creating values in a controlled vocabulary (e.g. genres in fiction) -- Chrome thinks this is a username field so brings up a user autocomplete. I guess it thinks that "Jane Smith" is a valid label!
2. Editing user details (username, full name, email, etc.) -- Firefox thinks the email is a good place to autocomplete the password.
With these, I've had to employ several workarounds to tell the web browsers that these are not login forms, so please don't autocomplete them as such, all because they ignore `autocomplete="off"`. I've got these working now, but if Chrome/Firefox decide to ignore the markup because of sites misusing them (like they've done before), I'll need to work out how to avoid this again.