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For external stylesheets (<stylesheet type="external"/> in the moki), the URI element currently contains the URI of the primary document. It should be the URI of the stylesheet itself. The bug has no impact whatsoever because the retrievedURI element is rather used whenever tests need to check the URI of a stylesheet. Note the URI is correct for embedded and inline CSS styles, since they are defined within the primary document, and thus their URI is that of the primary document. [NB: the bug is fixed in the soon-to-be-committed version of the library]
The refactored version released with bug 6800 fixes the bug.