父元素没有相对定位也能使自己绝对定位

2015/10/11 35682

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    <meta charset="UTF-8">
    <title>Document</title>
    <style type="text/css">
      html,body{margin: 0; padding:0;}
        *{padding:0; margin: 0}
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</head>
<body>
    <div class="father">
      <div class="child">fd</div>
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