Fixed positioning in Mobile Safari

position:fixed

[…] position:fixed now works on iOS5! What this means to developers: it’s now very easy to create top and bottom toolbars for your web apps. […]

overflow:scroll

[…] now it works on iOS5! […] One criticism so far: there’s no inertia scroll on this element, so it doesn’t quite feel the same as scrolling the page.

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http://davidbcalhoun.com/2011/new-mobile-safari-stuff-in-ios5-position-fixed-overflow-scroll-new-input-type-support-web-workers-ecmascript-5

 

Other links

IOS