| 123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657 | <!DOCTYPE html><html lang="en"><head>    <meta charset="UTF-8">    <meta name="viewport" content="width=device-width, initial-scale=1.0">    <title>Document</title>    <style>        .main {            border: 2px solid #000;        }        .one {            background: #f00;            float: left;            width: 200px;            height: 200px;            font-size: 30px;            color: #fff;        }        .two {            background: #0f0;            float: left;            width: 200px;            height: 200px;            font-size: 30px;            color: #fff;        }        .three {            background: #00f;            float: left;            width: 200px;            height: 200px;            font-size: 30px;            color: #fff;        }        img {            float: left;        }    </style></head><body>    <!-- <img src="../day1/images/img01.gif" alt="">    <img src="../day1/images/img01.gif" alt="">    <img src="../day1/images/img01.gif" alt=""> -->    <!--         为什么使用浮动:想让元素在一行显示        float:left/right;        问题:浮动会导致父元素高度塌陷        因为浮动会让元素脱离文档流 不占位     -->     <div class="main">        <div class="one">1</div>        <div class="two">2</div>        <div class="three">3</div>        我是一段话     </div></body></html>
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