z-index: auto : z index « CSS « HTML / CSS






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  2. CSS
  3. z index

z-index: auto

  
<!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;
            }
            div + div {
                background: lightblue;
                top: 40px;
                left: 40px; 
            }
            div + div + div {
                background: lightgreen;
                top: 60px;
                left: 60px;
            }
            div + div + div + div {
                background: pink;
                top: 80px;
                left: 80px;
            }
            </style>
    </head>
    <body>
        <div></div>
        <div></div>
        <div></div>
        <div></div>
    </body>
</html>








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5.Z-index Positioning
6.The z-index property controls how elements are layered along an invisible z-axis.
7.You can control the z-index explicitly, however, by providing an integer value to the z-index property.
8.Nested elements handle the z-index property differently. Descendant elements must always have a z-index higher than that of their parent.
9.opacity and z-index
10.z-index among li items
11.Inline style for z-index
12.z-index controls the stacking order of positioned elements.
13.A negative value places element below the normal flow, and a positive value places them above the flow.
14.Use z-index to change the overlap index
15.Set z-index to 100
16.The default value for z-index is auto.
17.z index, child index
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