iOS 5.0 landscape position fix drifts

[remy]

If you're using position:fixed in iOS 5.0 (not 5.1), the further you scroll a page, the position fixed will start drifting in the direction of the scroll until eventually it wasn't visible on the page. Scrolling back to the top would drift the element back in to view.

This was present in http://jsconsole.com?this - and only in landscape. A bug was filed for the 5.0 beta, but wasn't fixed. It appears fixed in 5.1, but applied to iPad and iPhone.