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Prefer 'title' to 'alt' in captions
trafficstars
Reddit titled their logo image like this: <a ... title="Congratulations to ..."> <img .... alt="Reddit.com " />
We ended up using "Reddit.com " as our caption but "Congratulations to ..." would have been better. If this pattern generalizes, we could have it ignore "alt" if it's able to find a "title" in an ancestor node (up to a certain depth, perhaps).
As of 2.2, TZP has site-specific logic which helps it find good captions. This change might still be a good idea but it's low priority.