html - Make CSS popup always stay on top of it's parent -

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i have 2 divs.

one position relative, , 1 position absolute.

they act somehow popup button.

is there way of forcing div position: absolute stay on top of it's parent, no matter height has?

on top mean "standing on top of it", not z-index property

jsfiddle example

<div style="position: relative; border: 1px solid #000; padding: 2px;">     <span>popup container</span>     <div style="position: absolute;">         <div style="height: 100px; background-color: #f0f0f0; top: 0;"></div>     </div> </div>

sizes calculated based on container not itself

so need give 

bottom:100%;

demo @ http://jsfiddle.net/gaby/rhb3m/4/


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