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Some roles override the default values of state/property attributes. For example, the default value of aria-orientation is "horizontal" but the scrollbar defaults to "vertical". We have not addressed these overrides in the UAIG.
Need to clarify what defaults mean. Add some wording before the table similar to wording in 5.3 Author Errors "If a required aria property for a given role is missing, user agents SHOULD process as if the following values were provided:" Then add defaults for particular roles if different. For example, in aria-orientation="vertical" cell, add "(default for scrollbar)"