Query z-index in IE6 with css

[tonyt]

To reproduce the problem

var aa = jQuey("#content").css('z-index');
var bb = (/^\d+$/.test($("#content").css('z-index')));

1.2.6 FF - aa -> auto; bb -> false IE6 -aa -> 0 ; bb->true

1.2.3 FF - aa -> auto; bb -> false IE6 -aa -> undefined ; bb->false

the element <div id="content"> some content here </div>

in css there is no attached z-index of this element

[tonyt]

sorry for the typo the code is

var aa = jQuery("#content").css('z-index');
var bb = (/^\d+$/.test(jQuery("#content").css('z-index')));

[flesler]

The undefined returned by jQuery 1.2.3 was wrong. It was a 0 "masked" into undefined. So it turns out that IE defaults zindexes to 0 and FF to auto. The question here is: Should we normalize this ? to what ?

I'll try to check other browsers to see what's the common denominator.

[tonyt]

Looking deeper of this - actually this is a bug in IE6/IE7. If this can help here is link to this problem:

 http://aplus.co.yu/lab/z-pos/

My question too is what should jQuery return in this case? Thank you

[dmethvin]

IE returns "auto" in many cases, so whatever is done here should be compared with "auto" elsewhere.

[jitter]

It's up to the browser what the default value for a css property is. Both auto and 0 are valid values.

 test case to proof valid values are returned.