css设计指南-笔记4

围住浮动元素的三种方法

<section>
<img src="images/rubber_duck.jpg">
<p>It's fun to float.</p>
</section>
<footer>Here is the footer element that runs across the bottom of the page. </footer>

section {overflow:hidden;}
img {float:left;}
//此处的overflow:hidden强迫父元素包含浮动的元素

section {float:left; width:100%;}       //width:100%使section与浏览器容器同宽
img {float:left;}
footer {clear:both;}

//section结束标签前加<div class="div1"></div>
img {float:left;}
.div1 {clear:left;}

//给section添加一个clearfix类
.clearfix::after {
content: "";
height: 0;
visibility: hidden;
display: block;
clear: both;

}