position: fixed doesn’t work on iPad and iPhone

A lot of mobile browsers deliberately do not support position:fixed; on the grounds that fixed elements could get in the way on a small screen.

The Quirksmode.org site has a very good blog post that explains the problem: http://www.quirksmode.org/blog/archives/2010/12/the_fifth_posit.html

Also see this page for a compatibility chart showing which mobile browsers support position:fixed;: http://www.quirksmode.org/m/css.html

(but note that the mobile browser world is moving very quickly, so tables like this may not stay up-to-date for long!)

Update:
iOS 5 and Android 4 are both reported to have position:fixed support now.

I tested iOS 5 myself in an Apple store today and can confirm that it does work with position fixed. There are issues with zooming in and panning around a fixed element though.

I found this compatibility table far more up to date and useful than the quirksmode one:
http://caniuse.com/#search=fixed

It has up to date info on Android, Opera (mini and mobile) & iOS.

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