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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>








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1.'z-index' Example
2.z-index number
3.z-index settings
4.z-index: auto
5.z-index: child index
6.Z-index Positioning
7.The z-index property controls how elements are layered along an invisible z-axis.
8.You can control the z-index explicitly, however, by providing an integer value to the z-index property.
9.Nested elements handle the z-index property differently. Descendant elements must always have a z-index higher than that of their parent.
10.opacity and z-index
11.z-index among li items
12.Inline style for z-index
13.z-index controls the stacking order of positioned elements.
14.A negative value places element below the normal flow, and a positive value places them above the flow.
15.Use z-index to change the overlap index
16.Set z-index to 100
17.The default value for z-index is auto.
18.Larger values move them closer to the user in the stacking order.
19.Stacking with z-index
20.z-index value
21.three layers of div tags
22.z-index and sibling selector
23.z-index and child selector