Why Doesn't `position: fixed` Always Work in Mobile Safari?

Mobile Safari and position: fixed - a Guide

Problem Facing Developers

iOS mobile Safari users have reported a common problem with fixed position elements. Despite being implemented using CSS's fundamental 'position: fixed', these components fail to update while scrolling. Several fixes have attempted to address this issue, including iScroll and Sencha's fix. Unfortunately, these solutions have not been consistently effective.

Inherent Mobile Browser Limitations

To mitigate potential conflicts on small screens, many mobile browsers intentionally withhold support for 'position: fixed'. The Quirksmode website provides an in-depth analysis of this issue in a blog post: http://www.quirksmode.org/blog/archives/2010/12/the_fifth_posit.html.

For a current view of browser compatibility, refer to http://www.quirksmode.org/m/css.html; however, it's worth noting that this information may quickly become outdated due to constant mobile browser advancements.

Updates and Workarounds

iOS 5 and Android 4 reportedly now support 'position: fixed'. While recent testing by the author confirms iOS 5's support for fixed positioning, minor setbacks with zooming and panning were apparent.

For a comprehensive and up-to-date compatibility table, please visit http://caniuse.com/#search=fixed. This resource includes detailed information on Android, Opera (mini and mobile), and iOS browsers.

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