html 4 浮动清除浮动

浏览数：18 / 时间：2015年06月09日

前一个元素设置浮动了

紧挨着的元素就浮动在上个元素的下面

被上个元素给覆盖

要不想被覆盖要清除浮动

clear:left clear:right

左浮元素不覆盖右边元素不覆盖

clear:both;

<!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" xml:lang="en">
<head>
    <meta http-equiv="Content-Type" content="text/html;charset=UTF-8">
    <title>Document</title>
    <style>
        #header{
            height:200px;
            width:200px;
            background:blue;
            color:white;
            float:left;
        }
        #content{
            height:200px;
            width:200px;
            background:green;
            color:white;
            float:left;
        }
        #footer{
            height:200px;
            width:200px;
            background:grey;
            float:left;            
        }
        #footer2{
            height:200px;
            width:200px;
            background:yellow;
            float:left;    
        }
        #main{
            clear:both;
        }
    </style>
</head>
<body>
        <div id="header">Header</div>
        <div id="content">Content</div>
        <div id="main"></div>
        <div id="footer">Footer</div>
        <div id="footer2">Footer</div>

</body>
</html>