Accordions as tabs

Hello

I often see controls that work like accordions marked-up with tab roles. They adhere to all the 'musts' in the spec - tabs are children of a tablist. This feels wrong to me, because we know how tabs are supposed to work, and these don't adhere to the expected behaviour.

However, as far as I can see, there is no prescriptive definition of the roles such as 'tab' for us to really outright say 'this is incorrect usage'. I can't see anything anywhere that says 'the tab role is this, therefore appropriate usage is this'. Can you point me in the right direction please?

Thanks

Sarah

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