This page, and all pages on the site, have a noticeable white flicker when you click the links. This was not the case in shipping Safari 4.0.5, but does happen in the nightlies. If you set the background color of the html element you can see that the flicker is actually the background color of it. ex. html { background-color: red; } causes a red flicker instead of a white one. This might be related to bug 34913 , but that bug seems to indicate it appears in Safari 4.0.4 which was not the case for this this issue.