clearfix.styl

// This is a hack that makes IE6 act almost as if overflow:hidden worked
// Empty clearfix divs are injected into every div by recuryjs, and this mixin
// overrides 'overflow' so that if you pass 'hidden', it adds a clear:both to the
// first descendent. IE also doesn't support the > selector so we emulate that
// with a further nesting inverting to clear:none
overflow(v)
  overflow v
 
  if v == 'hidden'
    .clearfix
      clear both
      .clearfix
        clear none