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In Web IDL W3C Working Draft 21 October 2010, Section 4.2.10, there appears: "An attribute with the [READ_ERROR] extended attribute must not also be declared with the [PutForwards] extended attribute." I believe "[READ_ERROR]" should read as "[Replacable]". Regards, Glenn
That is, "[Replaceable]".
Tab-complete typo. Fixed, thanks Glenn.