After a few hours' of google search, i found that there is autocomplete box bug since almost 10 years ago, until now, on IE9 the bug is still there.
problem:
when i have an input:text inside iframe, there are positioning bug of the autocomplete box - tested on IE8-compatibility mode, IE8, IE9.
The problem maybe related to the iframe's parent class (note: may not be the style, because i tested on IE9 console, disabling the class style will not solve the problem; on the other hand, giving the same style but removing the class
PARTIALLY SOLVE the autocomplete box positioning bug, and unfortunately only on IE9).
on IE8 and IE8 compatibility-mode, tried the same method, the position of the autocomplete box bug is still present: sometimes it is located around 50px below the input:text, sometimes it is about 8px above the input:text bottom (like IE9).
solution i founded from google result, people suggest "position:relative; left:0; top:0;", tested, doesn't work.
similar problem from another person: http://forums.asp.net/t/1538225.aspx/1
thanks for your help
use position:fixed with iframe non resizable and movable.
in my case it was a jquery dialog using an iframe.
still one issue remains,on scroll using mouse the autofill box remain in place.
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