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Same issue as https://www.w3.org/Bugs/Public/show_bug.cgi?id=13560 In the Windows accessibility APIs, the role/control type of an accessibility api object cannot be changed dynamically. The object must be destroyed and re-created. Doing so without losing focus or confusing AT is difficult and likely to be buggy. Not sure if this is also problematic on other platforms. Need to specify in mapping doc how this will be handled in APIs. Consider a WCAG failure for changing input type attribute at runtime.
for the record: in Firefox the accessible object is recreated and focus is refired.