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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​
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<head>
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<style type="text/css">
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  h1 {text-transform: uppercase}
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  p.uppercase {text-transform: uppercase}
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  p.lowercase {text-transform: lowercase}
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  p.capitalize {text-transform: capitalize}
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</style>
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</head>
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​
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<body>
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<h1>This Is An H1 Element</h1>
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<p class="uppercase">This is some text in a paragraph.</p>
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<p class="lowercase">This is some text in a paragraph.</p>
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<p class="capitalize">This is some text in a paragraph.</p>
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</body>
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​
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</html>
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​