The CSS reference
"z-index" - css property (v. css 2)
- Indicates the stack order of an element
- Initial value: auto
- The property is not inherited
- HTML usage: positioned elements
-
Browsers that support the z-index - property :
Possible z-index values:
value | Comments | CSS |
---|---|---|
auto | Follow the normal calculated stack order. | 2 |
integer | This integer is the stack level of the generated box in the current stacking context. The box also establishes a new stacking context. | 2 |
inherit | Will inherit the value from parent specification. | 2 |
Property "z-index" example:
<!DOCTYPE HTML >
<html>
<head>
<style type="text/css">
.pos1 { position: absolute;
left: 20px;
top: 20px;}
.pos2 { position: absolute;
left: 180px;
top: 20px;}
.pos3 { position: absolute;
left: 20px;
top: 60px;}
.pos4 { position: absolute;
left: 20px;
top: 120px;}
</style>
</head>
<body >
<p class="pos1" style="z-index: 2"><img
src="images/ferrari.png" alt="A ferrari image">
</p>
<p class="pos2" style="z-index: 3"><img
src="images/Trophy.png" alt="A Trophy image">
The trophy is over the bulp and the ferrari</p>
<p class="pos3" style="z-index: 1"><img
src="images/bulb.png" alt="A bulb image">
The bulp is under the ferrari and the trophy</p>
<div><br/><br/><br/>
This text will be beneath everything.</div>
<div class="pos4"style="z-index: 4">
This text will overlay all images.
</div>
</body>
</html>
Javascript access:
// To SET values ([o] is the target object)
[o].style.zIndex="z-index value"
// To GET values you must first get the computed style object
// To get that object in IE or Opera:
var cStyle=[o].currentStyle;
// To get that object in Firefox, Chrome or Safari (w3c-type):
var cStyle=window.getComputedStyle([o],null)
// To GET the property value:;
var value=cStyle.zIndex;
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