Overview of Major Changes in ARIA 1.2

• Some global attributes are deprecated in ARIA 1.2.
• Accessible name prohibited on some roles: caption, code, deletion, emphasis, generic, insertion, paragraph, presentation, strong, subscript and superscript.
• Added ARIA Interface Description Language (IDL) to simplify JavaScript access to ARIA attributes.
  For example, using element.ariaRole = 'button' to set the role of an element, instead of using element.setAttribute('role', 'button').
• Changes in the usage of aria-errormessage to hopefully improve implementation in assistive technologies.
• Clarifications to the definition and usage of aria-valuenow, aria-valuemin and aria-valuemax.

References

• Accessible Rich Internet Applications (WAI-ARIA) 1.2 (Candidate Recommendation)
• Substantive changes in ARIA 1.2 since the WAI-ARIA 1.1 Recommendation