案例:CSS案例     状态:可编辑再运行    进入竖版
 运行结果 
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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
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<html>
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<head>
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<style type="text/css">
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p > i:first-child {
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  font-weight:bold;
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  } 
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</style>
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</head>
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<body>
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<p>some <i>text</i>. some <i>text</i>.</p>
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<p>some <i>text</i>. some <i>text</i>.</p>
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</body>
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</html>
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