<div style="border:2px solid red;">
<div style="float:left;width:80px;height:80px;border:1px solid blue;">TEST DIV</div>
<div style="clear:both;"></div>
</div>
<style>
.clearfix:after{
visibility: hidden;
display: block;
font-size: 0;
content: ".";
clear: both;
height: 0;
}
* html .clearfix{zoom: 1;}
*:first-child + html .clearfix{zoom: 1;}
</style>
<div class="clearfix" style="border: 2px solid red;">
<div style="float: left; width: 80px; height: 80px; border: 1px solid blue;">
TEST DIV</div>
</div>
