There is a pretty big mistake in Safari 7 on Mac and iOS, which is hard to find, but pretty easy to fix.
In some situations, when using the position: fixed, Safari 7 cannot draw part of the page when scrolling. This can be seen at http://ruelculture.com/glitchy.html by clicking on the arrow, after waiting a bit and scrolling through the backup.
css safari mobile-safari ios7
Mike marcacci
source share