We added a synonymous role for role="presentation" in ARIA 1.1. This was done to reduce the amount of typing needed to support this function and to create a new role that was better understandable to page authors. Over some considerable time role="presentation" should be deprecated out. See: http://rawgit.com/w3c/aria/master/spec/aria.html#none
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*** This bug has been marked as a duplicate of bug 133367 ***