U.Helper

<div">
<div style="float:left;">left<br>left<br>left</div>
<div style="float:right;">right</div>
<div style="clear:both"></div>
</div>

<div class="clearfix">
<div style="float:left;">left<br>left<br>left</div>
<div style="float:right;">right</div>
</div>

.clearfix:after {
       visibility: hidden;
       display: block;
       font-size: 0;
       content: " ";
       clear: both;
       height: 0;
       }
.clearfix { display: inline-block; }
/* start commented backslash hack \*/
* html .clearfix { height: 1%; }
.clearfix { display: block; }
/* close commented backslash hack */