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<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
    <style type="text/css">
        /*子元素是单行行内元素*/
        #one1{
            width: 200px;
            height: 200px;
            background-color: #0eabff;
            /*设置水平居中*/
            text-align: center;
        }
        #one2{
            /*设置垂直居中*/
            line-height:200px;
        }
        /*---------------------------------------------------------------*/
        #two2{
            width: 200px;
            height: 200px;
            background-color: #ff5456;
            /*设置水平居中*/
            text-align: center;
            /*设置垂直居中*/
            display: table-cell;
            vertical-align: middle;
        }
        /*---------------------------------------------------------------*/
        /*子元素是块元素*/
        #three1{
            width: 200px;
            height: 200px;
            background-color: #ffe332;
            /*垂直居中*/
            display: table-cell;
            vertical-align: middle;
        }
        #three2 {
            width: 100px;
            height: 100px;
            background-color: #98fff3;
            /*水平居中*/
            margin: auto;
        }
        /*---------------------------------------------------------------*/
        /*子元素是不定宽的块元素*/
        #four1{
            width: 200px;
            height: 200px;
            background-color: #23ff0c;
            /*2,设置水平居中*/
            text-align: center;
            /*3,设置垂直居中方法二*/
            display: table-cell;
            vertical-align: middle;
        }
        #four1 ul li{
            /*1,先设置为行内元素*/
            display: inline;
            /*设置垂直居中方法一*/
            line-height: 200px;
        }
    </style>
<body>
    <div id="one1">
        <span id="one2">这是span标签</span>
    </div>
    <hr />
    <div id="two2">
        <span>这是span标签</span><br>
        <span>这是span标签</span>
    </div>
    <hr />
    <div id="three1">
        <div id="three2"></div>
    </div>
    <hr />
    <div id="four1">
        <ul style="margin: 0;padding: 0;">
            <li><a href="">1</a></li>
            <li><a href="">2</a></li>
            <li><a href="">3</a></li>
            <li><a href="">4</a></li>
            <li><a href="">5</a></li>
        </ul>
    </div>
</body>
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