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  public static function get_element_class_name( $element ) {
    $class_name = '';

    // TODO: Replace array_key_exists() with isset() check once WordPress drops
    // support for PHP 5.6. See https://core.trac.wordpress.org/ticket/57067.
    if ( array_key_exists( $element, static::__EXPERIMENTAL_ELEMENT_CLASS_NAMES ) ) {
      $class_name = static::__EXPERIMENTAL_ELEMENT_CLASS_NAMES[ $element ];
    }

    return $class_name;
  }