A beginner’s guide to web accessibility
ARIA Landmark Roles are helpful landmarks that can be used by AT to navigate a website.
Note: When you validate html using landmark roles, you’ll receive a warning stating these roles are redundant. In HTML5, several of the landmark roles are implicit via the native structural element which is supported by most modern desktop browsers with the exception of IE and iOS Safari. So, if you support IE and iOS browsers, you’ll want to use the landmark roles. For more information, read Quick Tip: Aria Landmark Roles and HTML5 Implicit Mapping.