Hum... http://www.webstandards.org/files/acid2/guide.html says : "If the Acid2 page is scrolled, the scalp will stay fixed in place, becoming unstuck from the rest of the face, which will scroll." So the Acid2 test is not supposed to stay in place when scrolling. -- Dont pass Acid2 test anymore https://launchpad.net/bugs/44900