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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div
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{
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border:2px solid;
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padding:10px;
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background:#dddddd;
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border-top-left-radius:2em;
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-webkit-border-top-left-radius:2em; /* Safari */
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}
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</style>
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</head>
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<body>
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<div>border-top-left-radius 属性允许您向左上角添加圆角边框。</div>
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</body>
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</html>
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