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Comment from James: 5.5. State and Property Mapping http://www.w3.org/WAI/PF/aria-implementation/#mapping_state-property """ 6. For forward compatibility with new WAI-ARIA properties in future versions, user agents SHOULD expose all properties not in these tables with a text string, removing the "aria-" prefix from the name. For example, aria-foo="bar" would be exposed with a text string foo=bar, since aria-foo is not a currently known WAI-ARIA property. """ It seems like a really bad idea to change the attribute key by removing "aria-". Even if the browser doesn't recognize it, these DOM attributes should be exposed as exact key/value pairs. Suggest striking everything after "tables with a text string."
This is already implemented in both IE and FF.