Purpose of Z-index

[kadnan]

Hello,

what is the use of Z-index and what's the minimum or maximum value?

The reason I asked that I have made a greaseMonkey script which just add a new DIV on runtime and move it on the movement of Mousemovement. It works fine most of the site but when tried with yahoo! search engine,it just displaced a bit and then got halted.

I am unable to figure out whether this is z-Index issue or what that same div can be moved on other websites but not on Yahoo

[phranque]

the z-index sets the stacking order for [hint]positioned[/hint] elements.
i'm not sure if there is an actual (2ⁿ) limit, but it can essentially be any positive or negative integer or zero.
[w3.org...]

[Robin_reala]

As a side note, a quick flick through Moz's source [lxr.mozilla.org] suggests that 2147483647 is the biggest z-index possible [lxr.mozilla.org] which coincidentally is the maximum size of a signed 32-bit integer.

[kadnan]

Thanks for reply. Does Z-index makes any difference in movement of a DIV?