关于CSS3三角的实现

1，向上的三角

1 <!doctype html>
2 <html>
3 <head>
4 <meta charset="utf-8">
5 <title>border-radius</title>
6 <style>
7 div{
8     width:0;
9     height:0;
10     border-left:20px solid transparent;
11     border-right:20px solid transparent;
12     border-bottom:20px solid #ccc;
13     }
14 </style>
15 </head>
16 <body>
17 <div>
18 </div>
19 </body>
20 </html>

2，向下的三角

1 <!doctype html>
2 <html>
3 <head>
4 <meta charset="utf-8">
5 <title>border-radius</title>
6 <style>
7 div{
8     width:0;
9     height:0;
10     border-left:20px solid transparent;
11     border-right:20px solid transparent;
12     border-top:20px solid #ccc;
13     }
14 </style>
15 </head>
16 <body>
17 <div>
18 </div>
19 </body>

20 </html>

3，向左的三角

1 <!doctype html>
2 <html>
3 <head>
4 <meta charset="utf-8">
5 <title>border-radius</title>
6 <style>
7 div{
8     width:0;
9     height:0;
10     border-top:20px solid transparent;
11     border-bottom:20px solid transparent;
12     border-right:20px solid #ccc;
13     }
14 </style>
15 </head>
16 <body>
17 <div>
18 </div>
19 </body>

20 </html>

4，向右的三角

1 <!doctype html>
2 <html>
3 <head>
4 <meta charset="utf-8">
5 <title>border-radius</title>
6 <style>
7 div{
8     width:0;
9     height:0;
10     border-top:20px solid transparent;
11     border-bottom:20px solid transparent;
12     border-left:20px solid #ccc;
13     }
14 </style>
15 </head>
16 <body>
17 <div>
18 </div>
19 </body>

20 </html>