CSS模拟三角箭头

1.很早就用这个来做箭头了但是之前都是将border设为solid的但是就要设背景色如果背景色改了效果就出错了~ 如果设为透明则不兼容IE6

现在设为dashed 就可以设为透明也可以兼容IE6了

2.其中line-height:0;与oveflow:hidden;需保留其中之一才可以兼容ie6

代码如下：

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>css实现的箭头</title>
<style type="text/css">
.wrap
{
    width:200px;
    height:50px;
    position:relative;
    margin-top:50px;
    background:#080;
}
.arrow
{
    width:0;
    height:0;
    line-height:0;/*for ie6*/
    position:absolute;
    left:50%;
    margin-left:-17px;
    top:-32px;
    font-size:0;
    border-width:16px;
    border-color:transparent transparent #080;
    border-style:dashed dashed solid;/*dashed for ie6*/　
　 overflow:hidden;/*for ie6*/　
}
.test{
    position:absolute;
    width:0px;
    height:0px;
    font-size:0px;
    border-width:8px;
    border-style:dashed dashed solid dashed;
    border-color:transparent transparent #30C transparent;
    overflow:hidden;
    }
</style>
</head>
<body>
<div class="wrap">
  <div class="arrow"></div>
</div>
<br/>
<div class="test"></div>
</body>
</html>