Valid Autocomplete Values (valid-values)
Check that autocomplete values are from the W3C-approved list and do not contain typos or non-standard values.
Autocomplete on non-widget role:
This input is focusable due to tabindex="0", but has a role of banner, which is not a widget role. Since autocomplete is only allowed on form-related widget roles, this combination is invalid and fails WCAG 1.3.5.