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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img.normal
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{
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height: auto
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}
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​
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img.big
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{
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height: 160px
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}
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​
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img.small
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{
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height: 30px
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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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<img class="normal" src="/img/eg_smile.gif" />
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<br />
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<img class="big" src="/img/eg_smile.gif" />
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<br />
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<img class="small" src="/img/eg_smile.gif" />
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​
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</body>
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</html>
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​