How to detect lack of position:fixed in a generic way?

Question

On mobile devices such as the iPad, I would like to disable a feature that only works if position:fixed is supported. Is there a way to detect these devices without using th

Answer 1

also returns a false-positive on Opera Mini.

Why not simply set a position:fixed on some element and then read it back? If position:fixed not supported returned value, should not be equal to fixed in theory

that does not work on Opera Mini: you can set position to "fixed", it will read as "fixed" even though it is not supported.