Main page heading
this is the first section element. It is announced by VoiceOver as an unidentified region because it has no label. JAWS 17 does not announce it as a region at all.
more stuff ending the first section
this is after the first section
this is the second section element, which has a label of "number two". JAWS announces it because it has a label, as does VoiceOver.
more stuff ending the second section
this is after the second section
this is the third section element but it has role of presentation so is not announced as a region at all by VoiceOver or JAWS.
more stuff ending the third section
more stuff at the end