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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body
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{
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background-image:url(/img/bg_flower.gif),url(/img/bg_flower_multi.gif);
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}
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</style>
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</head>
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<body>
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</body>
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</html>