While investigating an autofill issue in Chrome 73, I've noticed that XenForo uses
autocomplete="off"for the password field in the register form. I'm not aware of specific issues caused by this decision but it'd probably good to follow the recommendation to use
autocomplete="new-password"(on the change password form, too). See: https://www.chromium.org/developers/design-documents/form-styles-that-chromium-understands
See also: https://developers.google.com/web/fundamentals/design-and-ux/input/forms/?hl=en#recommended_input_name_and_autocomplete_attribute_valuesAdd an autocomplete attribute with a value of new-password for the password field on sign-up and change-password forms.