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None of Chrome, Firefox or IE implement: "These steps are not run for any other connections with the same origin and name but with a higher version" Remove that and update the corresponding notes. Relevant thread: http://lists.w3.org/Archives/Public/public-webapps/2014JanMar/0521.html
Fixed in https://dvcs.w3.org/hg/IndexedDB/raw-file/tip/Overview.html