z-index | Properties | CSS

The z-index CSS property specifies the stack level of the box in the current stacking context and whether the box establishes a local stacking context.

Syntax

CSS

z-index: value;

JS

object.style.zIndex = "value";

Values

<'z-index'> = auto | <integer> | inherit

auto

Automatically specified by the user agent.

<integer>

Specifies one or more decimal digits (0-9).

inherit

Specifies the same value as the parent.

Initial

auto

<!doctype html>
<html>
<head>
    <style>
        img
        {
            position: absolute;
        }
        img:nth-of-type(1)
        {
            background-color: red;
        }
        img:nth-of-type(2)
        {
            background-color: green;
            left: 50px;
        }
        img:nth-of-type(3)
        {
            background-color: blue;
            left: 100px;
        }
    </style>
    <script>
        function myfunction(myvar)
        {
            var elements = document.querySelectorAll("img");
            for(var i = 0; i < elements.length; ++i)
            {
                elements[i].style.zIndex = myvar;
                if(myvar == "integer")
                {
                    elements[i].style.zIndex = elements.length - i;
                }
            }
        }
    </script>
</head>
<body>
    <button onmouseover="myfunction(innerHTML)">initial</button>
    <button onmouseover="myfunction(innerHTML)">auto</button>
    <button onmouseover="myfunction(innerHTML)">integer</button><br>
    <img alt="Happy Face" src="/assets/svg/HappyFace.svg">
    <img alt="Happy Face" src="/assets/svg/HappyFace.svg">
    <img alt="Happy Face" src="/assets/svg/HappyFace.svg">
</body>
</html>

Links

World Wide Web Consortium (W3C)

Syntax

CSS

JS

Values

Initial

Examples

auto

integer

JS

Links