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<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>文档标题</title>
</head>
<body>
<div>
header
</div>
<div id = "Content">
<div id = "Content-TopLeft">main</div>
<div id = "Content-TopRight">Years</div>
<div id = "Content-Bottom">
control
footer
</body>
</html>
输入 JavaScript 代码……
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#Content-TopRight {
height: 300px;
width: 200px;
margin: 20px;
float: left;
background: green;
}
#Content-TopLeft {
width: 500px;
#Content {
height: 450px;
background: blue;
#Content-Bottom {
height: 100px;
width: 740px;
margin-left: 20px;
float:left;
background: red;