This is a test URL for some iPad optimization I am doing on a website:
When you scroll down, the blue/black marble menu should "stick" to the top of your device window. When you scroll back up, it should "unstick".
If I hold my finger on the screen to drag scroll, and make the menu "stick", I end up with a gray line at the bottom of the "#fixnav" element, right below the menu.
If I flick my finger to auto-scroll instead of dragging, the gray line does not appear.
If I do the same thing using Firefox (on my computer, not iPad), I also see a gray line, but its not in the exact same place.
I can't see any line on FF and I don't have an iPad to test that.
If you can reproduce it on FF, could you take a screenshot and point where the line is?