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That's because whoever coded this page decided that it's a good idea to emulate "background-position: fixed" by updating the "background-position" of the #main element on every scroll event. Which seems quite stupid if you ask me.

word. yep, something like background-attachment to fixed when the element is scrolled into view

This was almost too annoying for me to actually pay attention to the page.

I had to use this 'zap' bookmarklet[1] on it. It was way too distracting.

[1] https://www.squarefree.com/bookmarklets/zap.html

It's probably done like that because iDevices don't support fixed positioning. Some browser detection and different CSS/JS profiles based on browser type would probably be warranted.

I can see how mobile devices that don't want a mobile version of the site kind of necessitate this, but surely Apple could have gone about this better.

That's idiotic, sacrificing the majority for the minority.

Thanks for the tip Marcus. We've fixed this now.

Safari on Lion is jittery as well.