How to make child element higher z-index than parent? [duplicate]

Question

Suppose I have this code:

<div class="parent">     <div class="child">         Hello world     </div> </div>  <div class="wholePage"></div> 

This jsFiddle: http://jsfiddle.net/ZjXMR/

Now, I need to have<div class="child"> in above of <div class="wholePage"> but in the jsFiddle you can see that the child element rendered before <div class="wholePage">.

If you remove the parent class position or z-index, everything works fine. This is the correct behavior that I need: http://jsfiddle.net/ZjXMR/1/

How can I do that with z-index and without removing anything from page?

Answer 1

This is impossible as a child's z-index is set to the same stacking index as its parent.

You have already solved the problem by removing the z-index from the parent, keep it like this or make the element a sibling instead of a child.