I have a position:fixed Element A that contains Element B that's much wider and sometimes taller than A. I set Element A to overflow-x:hidden to prevent scrolling in the horizontal direction but it's not working. This issue doesn't occur in iOS's UIWebview.
Does anyone know why?
It's not good idea to user fixed position in Mobile browsers.
There's many issues about this feature in mobile phone and it does not support currently before android version 3 (http://caniuse.com/#search=fixed).
I suggest that you change your design with combination of absolute+relative positioning
