Role Attribute 1.0 is now a completed Web Standard, published today as a W3C Recommendation. Role Attribute is an XML attribute that allows authors to add semantic information to documents. Role Attribute supports WAI-ARIA, the Accessible Rich Internet Applications technical specification for making dynamic, interactive web content accessible to people with disabilities.
For details on the role attribute, see the Role Attribute 1.0 document.
Source: W3C WAI