node_modules/less/test/css/extend-clearfix.css

.clearfix,
.foo,
.bar {
  *zoom: 1;
}
.clearfix:after,
.foo:after,
.bar:after {
  content: '';
  display: block;
  clear: both;
  height: 0;
}
.foo {
  color: red;
}
.bar {
  color: blue;
}