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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<!DOCTYPE html>
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<html>
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<head>
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<style>
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p:first-letter
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{
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font-size:200%;
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color:#8A2BE2;
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}
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</style>
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</head>
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<body>
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​
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<h1>Welcome to My Homepage</h1>
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<p>My name is Donald.</p>
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<p>I live in Duckburg.</p>
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<p>My best friend is Mickey.</p>
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​
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</body>
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</html>
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​