When going right then returning at the extreme left (so that the MacOS logo move from right to left and back again at the start position), we can see some trails left by the MacOS logo.
Created attachment 21600 [details]
Here is a screen shot of the trails left by the logo.
Note that this effect can also be seen in QtWebKit
(In reply to comment #2)
> Note that this effect can also be seen in QtWebKit
Get the effect in Safari 3.1.1 (Windows) too.
Removing the ports as this is confirmed on all ports. Setting to CSS component for now.
Works fine now on Mac.