spec: For the standard role mechanism of the accessibility API, the user agent MUST use the first token in the sequence of tokens in the role attribute value which matches, on comparison, the name of any non-abstract WAI-ARIA role. example: role="main button", main role is landmark and isn't not presented in nsARIAMap that makes us to ignore it. We need to run through the spec and find all non-abstract roles that aren't presented in our ARIA map and put them there.
related discussion: http://lists.w3.org/Archives/Public/wai-xtech/2012Mar/0166.html
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