css案例学习之span边框实现的特殊效果

bottom left

bottom right

top left

top right

配合颜色来使用，实现一些神奇的效果

#menu a span{height:0;width:0;/*border-top:solid 6px #fff;border-left:solid 6px #f90;*//*border-top:solid 6px #fff;border-right:solid 6px #f90;*//*border-bottom:solid 6px #fff;border-left:solid 6px #f90;*/border-bottom:solid 6px #fff;border-right:solid 6px #f90;position:absolute;top:0;left:0;overflow:hidden;}

<div id="menu"><a href="#"><span class="left"></span> Home </a> <a href="#"><span class="left"></span>Contact Us </a><a href="#"><span class="left"></span>Web Dev </a> <a href="#"><span class="left"></span>Web Design </a> <a href="#"><span class="left"></span>Map    </a></div>

说明：当span的height、width设置为0的时候，配合border的样式，就能实现神奇的边框效果

完整代码如下

<!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><style>#menu {font-family:Arial;font-size:14px;}#menu a, #menu a:visited {display:block; float:left;position:relative;background-color:#c00;color:#fff; text-decoration:none;padding:6px;margin:1px 0 0 1px; }#menu a span{height:0;width:0;border-bottom:solid 6px #c00;border-left:solid 6px #fff;position:absolute;top:0;left:0;overflow:hidden;}#menu a:hover{background-color: #F90;color:#333}#menu a:hover span{border-bottom:solid 6px #f90;}</style><meta http-equiv="Content-Type" content="text/html; charset=utf-8" /><title>自适应的水平的菜单</title></head><body><div id="menu"><a href="#"><span class="left"></span> Home </a> <a href="#"><span class="left"></span>Contact Us </a><a href="#"><span class="left"></span>Web Dev </a> <a href="#"><span class="left"></span>Web Design </a> <a href="#"><span class="left"></span>Map    </a></div>
</body>
</html>