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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>
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>
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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