Identifying what the Region actually is sounds very similar with identifying the nature of a Node using NodeType? Is this pattern applicable here as well?
https://developer.mozilla.org/en/nodeType Andrei. From: webkit-dev-boun...@lists.webkit.org [mailto:webkit-dev-boun...@lists.webkit.org] On Behalf Of Adam Barth Sent: Friday, July 27, 2012 1:15 AM To: Alan Stearns Cc: Kentaro Hara; Elliott Sprehn; webkit-dev@lists.webkit.org; Sam Weinig Subject: Re: [webkit-dev] Multiple inheritance in the DOM For Alex's suggestion above, would there be any problems with a parameter (for the first method) and return type (for the second) that could be an Element or something else? Adding two helper methods seems messier to me than what's currently specced, but I'm open to the idea if it's much easier to implement. It depends on how many things will implement Region. If there are N things, you'll need to add N properties and you're essentially asking web developers to call QueryInterface on the object to see what sort of Region it really is. Adam
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