 collection of links suitable for use when navigating the page or related pages.
* `"region"`: A section sufficiently important that users will likely want to be able to navigate to the section easily. Use of `role="region"` should be limited to sections containing content with a purpose that is not accurately described by one of the other landmark roles. Each `role="region"` **must**  have a brief label that describes the purpose of the content in the region.
* `"search"`: A region for searching content.
