Background-attachment: fixed does not work

I’m trying to fix my background so that it does not move between page transitions.

if im right this is done with background-attachment: fixed and background-position: 0 0
However this does not work.

Here a demo:

I also tried setting the background to body and make the pane transparent, but then it does not play nice with the transition between the page.(overlapping)

Does someone have an idea how to solve this?

looks like this is a bug from Chrome/firefox but it works in IE …
is there a workaround?