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"3.2.7.4 Implicit ARIA Semantics" suggest <tbdody><thead> and <tfoot> to have a default role of rowgroup with no override restrictions
Note that this role, "rowgroup" was added for support of presentation role inheritance on tables, so that you could add it to the <table> element but would not have to add it to the descendant thead/tbody/tfoot/th/td, etc. At the time it was not mapped to any API because the rowgroup views were never rendered. Since then, Firefox has started exposing it to some of the platform APIs, but updating the HTML spec to mention this default mapping is mostly informative, as there is no real need to expose these views to the accessibility APIs.
move to aam - note aria rowgroup role http://www.w3.org/TR/wai-aria-1.1/#rowgroup
moved to html aam spec