. * * @param array $element * A render element. * * @return bool */ protected static function isLinkRelStylesheet(array $element) { return (isset($element['#type']) && $element['#type'] === 'html_tag') && (isset($element['#tag']) && $element['#tag'] === 'link') && (isset($element['#attributes']) && isset($element['#attributes']['rel']) && $element['#attributes']['rel'] === 'stylesheet'); } /** * Whether the render element is a