本文介绍了clearfix在网页布局中的应用，通过使用clearfix类，可以更简洁地清除浮动元素，避免布局错乱。
.clearfix:after { content: "."; visibility: hidden; display: block; height: 0; clear: both;}
Normally you would need to do something as follows:
<div style="float: left;">Sidebar</div>
<div style="clear: both;"></div> <!-- Clear the float -->
With clearfix, you only need to
<div style="float: left;" class="clearfix">Sidebar</div>
<!-- No Clearing div! -->
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