层就自动适应高度

<!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>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>无标题文档</title>
</head>

<body>
<div style="overflow:hidden; margin:auto; width:100px;">不设置height,加上overflow:hidden; 层就自动适应高度</div>
<div style="overflow:hidden; margin:auto; width:100px;">不设置height,加上overflow:hidden; 层就自动适应高度</div>

</body>
</html>

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