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This is a work item bug for removing the "Need a way to convey error information." issue box from 'Append Error' algorithm section. It isn't clear at this point what information would actually be useful to report. The plan is to remove this issue from the spec for now and then open a new bug for adding error reporting based on implementation & authoring experience.
Changes committed. https://dvcs.w3.org/hg/html-media/rev/237133bfdd57