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boxx2.html
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<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title></title>
<style type="text/css">
.clearfix::after{
content: "";
clear: both;
/* display: block; */
display: table;
width: 0;
height: 0;
font-size: 0;
visibility: hidden;
}
/* emmet */
.f{
/* margin:200px 500px; */
width: 500px;
/* height: 300px; */
border: 1px solid #000;
}
.f .s{
width: 50px;
height: 50px;
background: red;
float: left;
}
.f .s1{
background: red;
}
.f .s2{
width: 70px;
height: 70px;
background: green;
}
.f .s3{
width: 90px;
height: 90px;
background: blue;
}
/*
浮动
脱离常规流
该元素后面的兄弟元素和父元素会认为他消失啦。
向左或向右浮动，浮动到上一个同方向浮动元素的边缘，否则到父元素的边缘。
一定要清除浮动
清除浮动的方式
在产生浮动元素的弟弟元素上清除浮动
clear both
left
right
none
在产生浮动元素的父元素上添加clearfix
.clearfix::after{
content: "";
clear: both;
display: block;
}
.clearfix::after{
content: "";
clear: both;
display: table;
width: 0;
height: 0;
font-size: 0;
visibility: hidden;
}
*/
.k{
width: 100px;
height: 100px;
background-color: #000;
}
</style>
</head>
<body>
<!-- 新闻模块 -->
<div class="f clearfix">
<div class="s s1">1</div>
<div class="s s2">2</div>
<div class="s s3">3</div>
<!-- <div style="clear: both;"></div> -->
<!-- <span style="display:block;clear: both;"></span> -->
</div>
<!-- 广告模块 -->
<!-- <div class="k"></div> -->
</body>
</html>