iOS 7 iPad Landscape Bug

The whole red border should be fully visible inside the visible window!
The window.innerHeight variable reports the correct size, but html elements with 100% height relative to the full-page-height are 20px too large (only in landscape mode on the iPad)!

Current heights (testelement = the 100% height element with the red-border):

All values should be the same!
Rotate the iPad between landscape and portrait mode to see the changing sizes.