[Accessibility]All content must reside within a WAI-ARIA landmark or labelled region role.

[atreyeemukhopadhyay]

The WAI ARIA specification defines a set of specialised “landmark” roles. These roles provide a method to programmatically identify commonly found sections of web page content in a consistent way.This allows assistive technologies to provide users with features which they can use to identify and navigate to sections of page content