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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<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
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<html>
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<head>
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<style type="text/css">
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a[href="//www.w3xue.com/"][title="W3xue"]
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{color: red;}
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</style>
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</head>
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​
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<body>
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<a href="//www.w3xue.com/" title="W3xue">W3xue</a>
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<a href="//www.w3xue.com/html/oldcss/" title="CSS">CSS</a>
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<a href="//www.w3xue.com/html/" title="HTML">HTML</a>
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</body>
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</html>
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​