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I'm confused, you said there's a bug but as far as I can tell it's just that Safari disables using "tab" for more than form elements by default.

It might not be a bug in the sense that it's a spec violation, but it's behavior that every other browser I've used for 15 years has.

If this were a commercial product (my wiki), there would be a bug in the tracker for it :) In the link people have given JS workarounds.