border:20px solid transparent;
_border-color:tomato;
_filter:chroma(color=tomato);
width:0;
height:0;
overflow:hidden;
display: inline-block;
注意：当前层的背景色在IE6浏览器，不会显示，可以在外面加一个层，再加背景颜色。
/************例子 例子例子例子例子例子例子***********/
<div class="box">
<span class="borderConrner"></span>
</div>
<style>
.borderConrner{border-color: transparent; _border-color: tomato; _filter: chroma(color=tomato); border-width: 7px 13px; border-style: solid; border-bottom-color: #8ecb92; display: inline-block; width: 0; height: 0; overflow: hidden;
}
.box{background:#f00;
float:left;
}
</style>
------------文档如下------------------------
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "">
<html xmlns=" "> <head> <meta http-equiv="Content-Type" content="text/html; charset=utf-8" /> <title>无标题文档</title> <style> .borderConrner{border-color: transparent; _border-color: tomato; _filter: chroma(color=tomato); border-width: 7px 13px; border-style: solid; border-bottom-color: #8ecb92; display: inline-block; width: 0; height: 0; overflow: hidden; } .box{ width:100px; height:200px; border:1px solid #f60; margin:0 auto; text-align:center;/*background:#f00;*/} </style> </head> <body> <div class="box"> <span class="borderConrner"></span> </div> </body> </html>