=hyphenated-lowercase()
  content: ''

=snake_case()
  content: ''

=camelCase()
  content: ''

=PascalCase()
  content: ''

=Camel_Snake_Case()
  content: ''

=SCREAMING_SNAKE_CASE()
  content: ''

=_with-leading-underscore()
  content: ''

=_does_NOT-fitSTANDARD()
  content: ''

.class
  +snake_case()

.test
  @extend .pure-u-1-6

.test
  @at-root .child_snake_case
    content: 'foo'

@import '_foo.scss'

@keyframes fade_it
  0%
    transform: scale(1.0)
  25%
    transform: scale(1.1)
  50%
    transform: scale(1.0)
  75%
    transform: scale(1.2)
  100%
    transform: scale(1.1)