Perhaps you spent some time browsing through the WHATWG HTML 5 Spec, looking for the actual implementation details on the SQL offline storage interface? Sure, the doc has an “offline web applications” section, but that’s just a vague excursion on caching, leading many – including me – to eventually wonder if the offline storage option has maybe been dumped in favor of some obscure key-mapped depot mechanism? By the way, even Palm’s WebOS developer site links to that document, however it doesn’t actually contain any mention of that database interface.
Luckily, this part of the spec does exist after all:
w3.org/TR/offline-webapps
Hope that saves some like-minded souls a bit of head-scratching…