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The spec says [[ onabort Must be invoked whenever an abort event is targeted at or bubbles through the element or object. ]] where "abort" is linked to a definition saying it's a ProgressEvent. But Firefox, Opera and WebKit ignore the event's interface altogether. It would be good if the spec made this clear, e.g. by saying "an event of type 'abort'" and maybe even not linking to #event-abort. And maybe have a note somewhere saying that the event's interface is ignored (other than maybe for onbeforeunload -- it seems WebKit and Opera require the right interface but Firefox not).