Css3 clearfix class

A really nice way to clear float elements, taken from http://html5boilerplate.com/

.clearfix:after { 
 content: "."; 
 display: block; 
 height: 0; 
 clear: both; 
 visibility: hidden; 
}
.clearfix { 
 display: inline-block; 
}
* html .clearfix { 
 height: 1%; 
} /* Hides from IE-mac \*/
.clearfix { 
 display: block; 
}