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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<html>
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<head>
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<style type="text/css">
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p:first-letter 
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{
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color: #ff0000;
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font-size:xx-large
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}
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</style>
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</head>
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<body>
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<p>
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You can use the :first-letter pseudo-element to add a special effect to the first letter of a text!
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</p>
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</body>
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</html>
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