A blue iframe. In iOS < 4.1, a "swipe" registers as a start, a series of move and an end. In iOS 4.1, the same swipe registers as a start and series of move on the frame body, then a start on the iframe. If you repeat the swipe, an end may fire on the frame body before the normal sequence of events. When the sequence completes, you may get a start, end or both on the iframe itself. Return to bug description.