• ‘Web Accessibility Initiative for Accessible Rich Internet Applications’
• Marks up navigation, search forms, sidebars, headers, footers, main bits of a page to AT
• Useful for jumping around a page
• Supplement HTML semantic meaning (i.e. <nav> and role="navigation" are equivalent, but doesn't hurt to use both)

• Caption and summary elements for tables (equivalent to alt tags for data)
• Scope attributes added - these communicate whether a <th> is a column header or a row header
• Mini pager improvement for AT users
• ARIA attributes used to communicate sort order
• General clean up

Thanks!

@philw_