HTML DOM Style zIndex Property

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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

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>
Try it yourself »

Style Object

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