span设置宽和高当没有内容的时候也可以撑开

<!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>Div Middle</title> 
<style>
span{width:100px;height:100px;background:red;float:left}
</style>
</head>
 <body> 
    <span></span>
</body> 
</html>

posted on 2016-05-14 18:27 hduhdc 阅读(363) 评论(0) 编辑收藏举报