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+++ This bug was initially created as a clone of Bug #24601 +++ "3.2.7.4 Implicit ARIA Semantics" suggest <tbdody><thead> and <tfoot> to have a default role of rowgroup with no override restrictions
Closing as <thead>, <tbody>, and <tfoot> all leverage mapping for default role of rowgroup, with the exception of <thead> in UIA which has an explicit control type, Header, for "visual container for the labels for rows or columns of information" [1]. [1] https://msdn.microsoft.com/en-us/library/ms753110.aspx
Resolved this bug, which is really a duplicate of bug 28556 *** This bug has been marked as a duplicate of bug 28556 ***