CSS: Helfer Klassen "clearfix"

gistfile1

/*****Helfer Klassen*****/
.clear {clear: both;margin: -1px 0 0 0;height: 0;font-size: 0;line-height: 0;width: 100%;}
.ahem {position: absolute;overflow: hidden;height: 0;width: 0;left: -1000px;top: -1000px;}
.clearfix:after {content: ".";display: block;height: 0;line-height: 0;font-size: 0; clear: both;visibility: hidden;}
.clearfix {display: block;}
* + html .clearfix {display: inline-block;}
* html .clearfix {height: 1%;}