# Drift — TopNav `` **Status:** ok — ✓ in sync with the IR contract. | severity | kind | prop | detail | | --- | --- | --- | --- | | info | non-portable | `onNew` | type=function; not attribute-mappable — handle explicitly, never drop. | | info | prop-extra | `logoSrc` | on (attribute 'logo-src'), not in IR contract. | | info | prop-extra | `brand` | on (attribute 'brand'), not in IR contract. | | info | prop-extra | `slug` | on (attribute 'slug'), not in IR contract. |