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<title>Document</title>
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<!-- text-align水平居中是对父级使用还是子级使用 -->
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<p>居中</p>
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<p style="text-align: center">居中</p>
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style="
width: 100px;
height: 100px;
border: 1px solid #ccc;
text-align: center;
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>
<p>居中</p>
<!-- text-align属性,只对子元素起作用,并且可以被子元素继承 -->
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text-align属性,只对子元素起作用,并且可以被子元素继承