ARIA Landmark Regions

Landmark	Frequency of Usage on Page	Description
`banner`	None or one	The common content typically found at the top of each page in a website.
`complementary`	As many as needed, often none.	Identifies unique page content not part of the `main` landmark.
`contentinfo`	None or one	The common content typically found at the bottom of each page in a website.
`form`	As many as needed, rarely used in practice.	`form` role is only considered a landmark when it has an accessible name. Form landmarks can be used to identify multiple forms on the same page.
`main`	Typically one, but in web sites that aggregate content from other resources, some or all of the resources may identify a `main` landmark.	Identify the main content area or areas of a web page or application.
`navigation`	As many as needed.	Identify major groupings of navigational links to other pages in the website.
`region` (conditional)	As many as needed to identify important sub-sections of other landmarks, often none.	`region` role is only considered a landmark when it has an accessible name. Used to identify sub-sections of other landmarks
`search`	Typically one if there is a site search feature.	Identify website search features