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// The clearfix mixin
.clearfix() {
  &:after {
    content: ".";
    display: block;
    height: 0;
    clear: both;
    visibility: hidden;
  }
}
 
// Apply clearfix on .parent
.parent {
  .clearfix();
}

.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 */