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Description
When DataTransfer's method such as getData is called, Safari & Chrome both ignores the charset for the sake of equality at least on Mac. This would mean that, for example, setData('text/plain; charset=utf-8', 'foo'); is equivalent to setData('text/plain; charset=Shift_JIS', 'foo');. Firefox seems to treat these MIME types as distinct types even on Mac.
Given there is no mechanism to differentiate text MIME types based on charset on some platforms such as Mac, the spec should allow this behavior.