CSS z-index Property

February 10, 2021 12:37 pm IST

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CSS z-index Property

CSS z-index property specifies the stack order of an element.

Elements with a larger z-index cover those with a smaller one.

Note: z-index only works on positioned elements (relative, absolute, fixed, or sticky).

Example

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Syntax

Using CSS

element{ z-index: 1; }

Using Javascript

object.style.zIndex="1"

Animatable

Yes, z-index property is animatable. CSS Animatable Properties Reference.

Default Value

Default value for CSS z-index property is auto.

Property Value

The following table provides a list of values for CSS z-index property.

Value	Explanation
auto	The box does not establish a new local stacking context. The stack level of the generated box in the current stacking context is the same as its parent's box.
Number	This number is the stack level of the generated box in the current stacking context. Negative numbers are allowed.

Using JavaScript

In the following example, we will demonstrate how to change the CSS z-index property of an element using JavaScript.

Example

HTML Online Editor

<!DOCTYPE html> <html lang="en-US"> <head> <style> img{ position: absolute; left: 0px; top: 0px; width: 200px; height: 150px; z-index: -1; } </style> </head> <body> <h1>CSS z-index Property</h1> <img src="car-left.png"> <p>This is a paragraph.</p> <button onclick="myFunction()">Click Me</button> <script> var x = document.getElementsByTagName("img")[0]; function myFunction(){ x.style.zIndex = "1"; } </script> </body> </html>

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