position的relative

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"
        "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
    <title>relative1</title>
    <style type="text/css">
        .f-box{
            position: relative;
            /*border: 1px solid red;*/
        }
        .c1{
            background-color: purple;
            height: 100px;
            width: 100px;
        }
        .c2{
            background-color: yellow;
            height: 100px;
            width: 100px;
            position: absolute;/*1.relative非脱离文档流,以自己原来的位置为参照物
                                 移动后原来的位置还保留,所以是非脱离文档流
                                 2.absolute脱离文档流,给标签设置父标签后就会以父标签的
                                 左上角定位*/
            left: 100px;
        }
        .c3{
            background-color: blue;
            height: 200px;
            width: 200px;
        }
    </style>
</head>
<body>

    <div class="c1">1</div>
    <div class="f-box">
    <div class="c2">2</div>
    </div>
    <div class="c3">3</div>

</body>
</html>

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转载自www.cnblogs.com/TKOPython/p/12728023.html