Pages with a height of 100% on MobileSafari (iPad, iOS 7-only) have their window.innerHeight (672px) not matching their window.outerHeight (692px) in landscape orientation. This is reproducible and already a known issue for several users. (See: http://stackoverflow.com/questions/19012135/ios-7-ipad-safari-landscape-innerheight-outerheight-layout-issue) Test case: http://krpano.com/ios/bugs/ios7-ipad-landscape/
Also filed on bugreport.apple.com as: 16511628
Doesn't reproduce any more with iPadOS 15.3 (19D50), this can be closed.