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Style zIndex Property
Style Object
Definition and Usage
The zIndex property sets or returns the stack order of a positioned element.
An element with greater stack order (1) is always in front of another element with lower stack order (0).
Tip: A positioned element is an element with the position property set to: relative, absolute, or fixed.
Syntax
Set the zIndex property:
Object.style.zIndex="auto|number|inherit"
Return the zIndex property:
Object.style.zIndex
| Value | Description |
|---|---|
| auto | The browser determines the stack order of the element (based on its order in the document). This is default |
| number | An integer that defines the stack order of the element. Negative values are allowed |
| inherit | The value of the zIndex property is inherited from parent element |
Browser Support
The zIndex property is supported in all major browsers.
Tips and Notes
Tip: This property is useful if you want to create overlapping elements.
Example
Example
Change the stack order of an <img> 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">
<input type="button" onclick="changeStackOrder()" value="Change stack order" />
<p>Default z-index is 0. Z-index -1 has lower priority.</p>
</body>
</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">
<input type="button" onclick="changeStackOrder()" value="Change stack order" />
<p>Default z-index is 0. Z-index -1 has lower priority.</p>
</body>
</html>
Try it yourself »
Style Object
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Tutorials, references, and examples are constantly reviewed to avoid errors, but we cannot warrant full correctness of all content.
While using this site, you agree to have read and accepted our terms of use and privacy policy.
Copyright 1999-2012 by Refsnes Data. All Rights Reserved.
Tutorials, references, and examples are constantly reviewed to avoid errors, but we cannot warrant full correctness of all content.
While using this site, you agree to have read and accepted our terms of use and privacy policy.
Copyright 1999-2012 by Refsnes Data. All Rights Reserved.