safari javascript scrolling bug

I want to update a position of element on page, when page is scrolling. Simple example here http://jsfiddle.net/guzich/o7hdmt8q/

$(window).scroll(function(){ $("#test").css({'top':100+$(window).scrollTop()+'px'})})

It perfectly works in firefox and chrome, but in safari div element is twitches sometimes (you can try to scroll frequently scroll up and down to see it).