HTML DOM Style zIndex Property

# Style zIndex Property

Style Object

## Example

Change the stack order of an <img> element:

document.getElementById("img1").style.zIndex="1";
Try it yourself »

## 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.

Tip: This property is useful if you want to create overlapping elements.

## Browser Support

The zIndex property is supported in all major browsers.

## Syntax

Return the zIndex property:

object.style.zIndex

Set the zIndex property:

object.style.zIndex="auto|number|initial|inherit"

## Property Values

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
initial | Sets this property to its default value. Read about initial
inherit | Inherits this property from its parent element. Read about inherit

## Technical Details

Default Value: | auto
Return Value: | A String, representing the stack order of an element
CSS Version | CSS2

## More Examples

## Example

Change the z-index property value of an <div> element:

document.getElementById("myDIV").style.zIndex = "-1";
Try it yourself »

## Example

Return the z-index property value of an <img> element:

alert(document.getElementById("img1").style.zIndex);
Try it yourself »

## Related Pages

CSS tutorial: CSS Positioning

CSS reference: z-index property

Style Object

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