Style zIndex Property
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
