Position: Fixed Ineffective on iPad and iPhone
Many developers encounter difficulties with fixed positioning in iOS devices like iPad and iPhone. Despite the existence of solutions such as iScroll and Sencha, the problem persists that fixed elements remain stagnant when users pan the screen on mobile Safari.
This issue arises from a deliberate decision by mobile browser developers, who believe that fixed elements can obstruct visibility on small screens. Quirksmode.org provides an extensive explanation of the issue in this blog post: https://www.quirksmode.org/blog/archives/2010/12/the_fifth_posit.html
For a comprehensive compatibility chart outlining which mobile browsers support position: fixed, refer to this page: https://www.quirksmode.org/mobile/css.html. However, it's important to note that the mobile browser landscape evolves rapidly, making it essential to seek up-to-date information.
Recent Developments
iOS 5 and Android 4 have reportedly implemented support for position: fixed. Tests conducted in an Apple store confirm its operation in iOS 5, although some issues with zooming and panning around fixed elements exist.
For an even more current compatibility table, consult this resource: https://caniuse.com/#search=fixed. It provides up-to-date information on Android, Opera (mini and mobile), and iOS.
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