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[css layout][11] three fixed columns

1.全部float向左。#wrapper宽度900px

 1 #container {
 2   width: 900px;
 3   margin: 0 auto;
 4 }
 5 #wrapper {
 6   width: 900px;
 7   float: left;
 8 }
 9 #content {
10   margin-left: 400px;
11 }
12 #navigation {
13   width: 200px;
14   float: left;
15   margin-left: -900px;
16 }
17 #extra {
18   width: 200px;
19   float: left;
20   margin-left: -700px;
21 }
22 #footer {
23   clear: both;
24 }

2.float向右。#wrapper宽度900px

 1 #container {
 2   width: 900px;
 3   margin: 0 auto;
 4 }
 5 #wrapper {
 6   width: 900px;
 7   float: right;
 8 }
 9 #content {
10   margin-left: 400px;
11 }
12 #navigation {
13   width: 200px;
14   float: right;
15   margin-right: -200px;
16 }
17 #extra {
18   width: 200px;
19   float: right;
20   margin-right: -400px;
21 }
22 #footer {
23   clear: both;
24 }

3.float向右，#wrapper宽度500px

 1 #container {
 2   width: 900px;
 3   margin: 0 auto;
 4 }
 5 #wrapper {
 6   width: 500px;
 7   float: right;
 8 }
 9 #navigation {
10   width: 200px;
11   float: right;
12   margin-left: -200px;
13   position: relative;
14   left: -200px;
15 }
16 #extra {
17   width: 200px;
18   float: right;
19 }
20 #footer {
21   clear: both;
22 }

4.float向左，#wrapper宽度500px

 1 #container {
 2   width: 900px;
 3   margin: 0 auto;
 4 }
 5 #wrapper {
 6   width: 500px;
 7   float: left;
 8   margin-right: -400px;
 9   position: relative;
10   left: 400px;
11 }
12 #navigation {
13   width: 200px;
14   float: left;
15   margin-left: -100px;
16 }
17 #extra {
18   width: 200px;
19   float: left;
20 }
21 #footer {
22   clear: both;
23 }

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原文地址：https://www.cnblogs.com/qiudeqing/p/3423903.html