用css写三角形

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<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<title>三角形的写法</title>
<meta http-equiv="Content-Type" content="text/html; charset=gb2312" />
<style>
*{margin:0;padding:0;font-size:12px;font-family:Verdana, "宋体", Arial; line-height:1.8;list-style:none;}
#info,#nav{ margin:50px; border:1px dashed #FF3300; background:#FFFFCC; padding:50px;}
#info div{background:#f00; 0px; height:0px; overflow:hidden; margin-bottom:5px;}
/*一些三角的写法*/
#box_a{ border-top:5px solid #FFFFCC;border-left:5px solid #FF3300;border-bottom:5px solid #FFFFCC;}
#box_b{ border-top:5px solid #FFFFCC;border-right:5px solid #FF3300;border-bottom:5px solid #FFFFCC;}
</style>
</head>
<body>
<div id="info">
<h1>一些三角形的写法</h1>
 <div id="box_a"></div>
 <div id="box_b"></div>
</div>
</body>
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原文地址:https://www.cnblogs.com/zjx2011/p/2320613.html