z index, child index : z index : Box Model HTML CSS TUTORIALS

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z index, child index


 
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
<html>
    <head>
        <title></title>
        <style type='text/css'>
            div {
                position: absolute;
                padding: 10px;
                border: 1px solid black;
                opacity: 0.9;
                background: lightyellow;
                width: 100px;
                height: 100px;
                top: 20px;
                left: 20px;
                z-index: 4;
            }
            div > div {
                background: lightblue;   
                z-index: 3;
            }
            div > div > div {
                background: lightgreen;
                z-index: 2;
            }
            div > div > div > div {
                background: pink;
                z-index: 1;
            }
        </style>
    </head>
    <body>
        <div>div1
            <div>div2
                <div>div3
                    <div>div4
                    </div>
                </div>
            </div>
        </div>
    </body>
</html>