function genesis_a11y( $arg = 'screen-reader-text' ) {

  $feature = 'genesis-accessibility';

  if ( 'screen-reader-text' === $arg ) {
    return current_theme_supports( $feature );
  }

  $support = get_theme_support( $feature );

  // No support for feature.
  if ( ! $support ) {
    return false;
  }

  // No args passed in to add_theme_support(), so accept none.
  if ( ! isset( $support[0] ) ) {
    return false;
  }

  // Support for specific arg found.
  if ( in_array( $arg, $support[0], true ) ) {
    return true;
  }

  return false;

}