Progressive disclosure works with password managers as long as the hidden fields are still in the DOM and are simply rendered invisible to the user. For example

Progressive disclosure works with password managers as long as the hidden fields are still in the DOM and are simply rendered invisible to the user. For example, Apple's login forms work this way where they don't show the password until you've entered your Apple ID, but it still works just fine with 1Password (and with Safari's built-in password manager).