<!doctype html>
<html>
<head>
<meta charset="utf-8">
<title>无标题文档</title>
</head>
<body>
<div style="border:3px solid silver; width:300px;">
<div id="container" style="background-color: blue;">
<div style="float:left; background-color: green;">above</div>
<div id="DIV" style="margin:30px 0; background-color:gold;">content</div>
<div style="float:right; background-color: green;">below</div>
</div>
</div>
<hr>
<hr>
<div style="border:3px solid silver; width:300px;">
<div id="container" style="background-color: blue;">
<div style="position:absolute; background-color: green;">above</div>
<div id="DIV" style="margin:30px 0; background-color:gold;">content</div>
<div style="position:absolute; background-color: green;">below</div>
</div>
</div>
<hr>
<hr>
<div style="border:3px solid silver; width:300px;">
<div id="DIV1" style="margin-bottom:50px; background-color:gold;">above</div>
<div id="Float" style="float:left; background-color: green; width:100%;">Float</div>
<div id="DIV2" style="margin-top:50px; background-color:gold;">below</div>
</div>
</body>
</html>效果如下：
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