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HTML DOM zIndex Property

Complete Style Object Reference

Definition and Usage

The zIndex property sets the stack order of an element.

An element with greater stack order is always in front of another element with lower stack order.

Syntax

Object.style.zIndex=auto|number

Possible Values

Value	Description
auto	The stack order is equal to its parents
number	A number that defines the stack order of the element

Tips and Notes

Tip: Elements can have negative stack orders.

Note: zIndex only works on elements that have been positioned, like position:absolute;

Example

The following example changes the stack order of an element:

<html>
<head>
<style type="text/css">
#img1
{
position:absolute;
left:0px;
top:0px;
z-index:-1
}
</style>
<script type="text/javascript">
function changeStackOrder()
{
document.getElementById("img1").style.zIndex="1";
}
</script>
</head>
<body>

<h1>This is a Heading</h1>

<img id="img1" src="bulbon.gif" width="100" height="180">

<p>Default z-index is 0. Z-index -1 has lower priority.</p>

<input type="button" onclick="changeStackOrder()"
value="Change stack order" />

</body>
</html>

Try-It-Yourself Demos

zIndex - Change the stack order of an element

Complete Style Object Reference

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