I experienced this as well. It's quite a strange behavior as fixed positioned elements should be fixed to the viewport.
On a side note, Eric Meyer has a related topic on his blog - http://meyerweb.com/eric/thoughts/2011/09/12/un-fixing-fixed-elements-with-css-transforms/.
I experienced this as well. It's quite a strange behavior as fixed positioned elements should be fixed to the viewport.
On a side note, Eric Meyer has a related topic on his blog - http://meyerweb.com/eric/thoughts/2011/09/12/un-fixing-fixed-elements-with-css-transforms/.