案例：CSS3 案例     状态：可编辑再运行    进入竖版
 运行结果　
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<html>
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<head>
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<style type="text/css">
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p.serif{font-family:"Times New Roman",Georgia,Serif}
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p.sansserif{font-family:Arial,Verdana,Sans-serif}
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</style>
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</head>
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​
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<body>
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<h1>CSS font-family</h1>
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<p class="serif">This is a paragraph, shown in the Times New Roman font.</p>
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<p class="sansserif">This is a paragraph, shown in the Arial font.</p>
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​
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</body>
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</html>
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​