It's the bounce you see if you try to scroll past the end of some content. See this image for an example http://blog.christoffer.me/content/images/2015/12/2_tou

It's the bounce you see if you try to scroll past the end of some content. See this image for an example http://blog.christoffer.me/content/images/2015/12/2_touch_adds_rubberband_effect.gif http://blog.christoffer.me/content/images/2015/12/2_touch_ad...