先看看效果图：
<!doctype html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Document</title>
<style type="text/css">
#test1 {
height:20px;
width:20px;
border-color:#FF9600 #3366ff #12ad2a #f0eb7a;
border-style:solid;
border-width:20px;
}
#test2 {
height:0;
width:0;
overflow: hidden; /* 这里设置overflow, font-size, line-height */
font-size: 0; /*是因为, 虽然宽高度为0, 但在IE6下会具有默认的 */
line-height: 0; /* 字体大小和行高, 导致盒子呈现被撑开的长矩形 */
border-color:#FF9600 #3366ff #12ad2a #f0eb7a;
border-style:solid;
border-width:20px;
}
#test3 {
height:0;
width:0;
overflow: hidden;
font-size: 0;
line-height: 0;
border-color:#FF9600 transparent transparent transparent;
border-style:solid;
border-width:20px;
}
#test4 {
height:0;
width:0;
overflow: hidden;
font-size: 0;
line-height: 0;
border-color:#FF9600 transparent transparent transparent;
border-style:solid dashed dashed dashed;
border-width:20px;
}/*兼容IE6*/
#test5 {
height:0;
width:0;
overflow: hidden;
font-size: 0;
line-height: 0;
border-color:#FF9600 #3366ff transparent transparent;
border-style:solid solid dashed dashed;
border-width:40px 40px 0 0 ;
}
</style>
</head>
<body>
<p id="test1"></p><br>
<p id="test2"></p><br>
<p id="test3"></p><br>
<p id="test4"></p><br>
<p id="test5"></p><br>
</body>
</html>
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