Why Do Fixed-Positioned Elements Misbehave During iOS Panning?

Fixed Positioning Issues on iOS Devices

Question:

Despite attempting to utilize iScroll and Sencha libraries, why do fixed positioned elements fail to update during panning in mobile Safari on iOS devices?

Answer:

Mobile browsers often choose not to support "position:fixed" because fixed elements can obstruct browsing on smaller screens.

Technical Explanation:

Quirksmode.org provides an insightful analysis of the issue: http://www.quirksmode.org/blog/archives/2010/12/the_fifth_posit.html

Additionally, a compatibility chart is available at: http://www.quirksmode.org/m/css.html

iOS and Android Updates:

iOS 5 and Android 4 now reportedly support "position:fixed."

Personal Testing:

The author confirmed functional "position:fixed" in iOS 5, but it may suffer from zooming and panning limitations around fixed elements.

Updated Compatibility Table:

http://caniuse.com/#search=fixed offers real-time compatibility data for Android, Opera, and iOS.

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