One of the biggest gripes of web apps in Mobile Safari comes to an end. In iOS 5 Beta 2, you are able to do this on an element with CSS:
overflow: scroll; -webkit-overflow-scrolling: touch;
Quick demo requires iOS 5.0
And the content inside that element should get native style momentum scroll. Just like any other app in iOS.
There's indeed a noticeable difference in momentum between scrolling in native apps and in web pages. It's maybe the one single thing that makes you think: "Oh right, this is a web app". I guess iOS has a different scrolling behavior in web pages since it's actually helpful when there's a lot of tiny information on screen – a fast moving scroll would have been quite tricky to handle when precision-scrolling through long news articles. But for those who really want to create apps for the mobile browser with that native look-and-feel, this behavior is an obstacle.
Together with the previously revealed properties in Mobile Safari in iOS5,
position: fixed and
overflow: scroll , this is great news for web apps. Can't wait to test this.
Note: this is the second beta, and it's never dead certain that these features actually will arrive in the final version of the OS.