Android Browser textarea scrolls all over the place, is unusable
SOLUTION:The 3D webkit is broken in Android, this is causing this problem. Make sure you are not using -webkit-transform: translate3d(0, 0, 0); or -webkit-backface-visibility: hidden; on anything related to the inputs. :(
If at all possible, you can lockdown the scrolling of the screen while the user is typing by setting the overflow property of body to 'hidden' - you can selectively enable/disable it on focus/blur events. Of course this does mean that your user will not be able to scroll while typing
There is no magic answer. Android keyboard input interactions with web forms is simply horrendous. You have to thread the needle very carefully to make it work properly, and keyboard behavior is not the same across Android versions. But it is possible with a LOT of work (see our Sencha Touch framework for what's possible today - the other mobile web frameworks are tackling the exact same problems too).