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Grid - Required Owned Elements: row rowgroup → row http://www.w3.org/TR/wai-aria/roles#grid
test case http://stevefaulkner.github.io/html-mapping-tests/aria-tests/grid.html
Will try to check on this this week. But if I forget please remind me
As far as the cases in the file at http://stevefaulkner.github.io/html-mapping-tests/aria-tests/grid.html the ARIA spec doesn't define "role=grid with no rows or rowgroups inside" as invalid, as far as I can tell. I notice that the ARIA spec has a note that says, "A role that has 'required owned elements' does not imply the reverse relationship. While processing of a role may be incomplete without elements of given roles present as descendants, elements with roles in this list do not always have to be found within elements of the given role." As far as the "must be owned by" requirements in the ARIA spec, I believe the validator is already correctly checking all of those.