VoiceOver Focus and Safari on the iPad
We have found the same problem with landscape mode in Safari with Voiceover as:
The problem occurs most often in our web app on our pop-up dialog boxes that have a 'max-width:' CSS setting. There are still focus problems, but fewer, after removing the setting on those pages.
It happens on iPad & iPad pro & iPad mini, iOS 9 & iOS 10 beta.