// placeholders
$clearfix
  clearfix();

// blocks
u-pl-block            := {
  float               : left
}

u-pr-block            := {
  float               : right !important
}

// rules
.u-cf
  @extend $clearfix;

.u-pl
  {u-pl-block}

.u-pr
  {u-pr-block}

// placeholders
$clearfix
  clearfix();

// blocks
u-pl-block            := {
  float               : left
}

u-pr-block            := {
  float               : right !important
}

// rules
.u-cf
  @extend $clearfix;
  &:before
  &:after
    display: none;

.u-pl
  {u-pl-block}

.u-pr
  {u-pr-block}

Fix clearfix :before and :after visibility bug.
Fix clearfix :before and :after visibility bug.

Possibly due to an updated browser version or dependency but the
clearfix pseudo elements had become visible.
