父元素没有相对定位也能使自己绝对定位

2015/10/11 39282

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    <title>Document</title>
    <style type="text/css">
      html,body{margin: 0; padding:0;}
        *{padding:0; margin: 0}
        .child{position: absolute; left: 0;top: 0;right: 0; bottom: 0; width: 300px; height: 30px; margin:30px auto; background-color: pink;text-align: center; line-height: 30px;}
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</head>
<body>
    <div class="father">
      <div class="child">fd</div>
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