bottom left
bottom right
top left
top right
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配合顏色來使用，實現一些神奇的效果
#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>
說明：當span的height、width設置為0的時候，配合border的樣式，就能實現神奇的邊框效果
?
完整代碼如下
<!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>自適應的水平的菜單</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>
實現了一種被裁減的感覺
)+(1+2^(0.5)+3^(0.5))+…+(1+2^(0.5)+3^(0.5)+…+n^(0.5)))
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