.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 {
  @extend .snake_case;
}

.block-name__elem-name {
  content: '';
}

.block {
  &__element {
    &--modifier {
      color: green;
    }
  }

  &__another-element {
    &--modifier {
      color: red;
    }

    &--another-modifier {
      color: yellow;
    }
  }

  &--non-element-modifier {
    color: blue;
  }
}

.owner-name_mod-name_mod-val {
  content: '';
}

.owner-name {
  &_mod-name {
    &_mod-val {
      color: blue;
    }
  }
}

.site-search {
  color: blue;
  width: 50px;
  height: 100%;
}

.site-search__field {
  text-decoration: underline;
}

.site-search--full {
  color: green;
}

.hyphentated-lowercase {
  color: blue;

  &-with-suffix-extension {
    color: green;

    &-and-another {
      color: red;
    }
  }

  &-INVALID {
    color: pink;
  }
}

.one_parent,
.two_parents,
.third-invalid-parent {
  width: 10px;

  &_valid_child,
  &-invalid-child {
    height: 10px;
  }
}