Scrolling is a big issue here. I haven't looked into the source carefully but I saw the same behavior of wrong thing getting scrolled. My experience tells me that it's because they use div's scroll or multiple iframes. HTML in mobile browser is terrible at handling multiple scroller because it doesn't know where people touch or intend to scroll. Only famo.us seems to fix this problem by re-writing the whole scrolling feature. However, they screwed it up on some other parts (lolz..) which we heard things might improve.
It's actually just using the browsers scrolling mechanism. Android 4+, iOS 5+ ship with touch-scrolling that you can enable on an element so it's as close to native scrolling as you can get.
Right. I have tried that with jQuery Mobile and the behavior was similar to what I saw in this framework. Basically for mobile, it's nearly impossible to have main page scrolling and swipe right to pop out the left menu which also has its own scrolling.
