WP_Navigation_Block_Renderer::get_classes( array $attributes ): string

643	private static function get_classes( $attributes ) {644		// Restore legacy classnames for submenu positioning.645		$layout_class       = static::get_layout_class( $attributes );646		$colors             = block_core_navigation_build_css_colors( $attributes );647		$font_sizes         = block_core_navigation_build_css_font_sizes( $attributes );648		$is_responsive_menu = static::is_responsive( $attributes );649 650		// Manually add block support text decoration as CSS class.651		$text_decoration       = $attributes['style']['typography']['textDecoration'] ?? null;652		$text_decoration_class = sprintf( 'has-text-decoration-%s', $text_decoration );653 654		$classes = array_merge(655			$colors['css_classes'],656			$font_sizes['css_classes'],657			$is_responsive_menu ? array( 'is-responsive' ) : array(),658			$layout_class ? array( $layout_class ) : array(),659			$text_decoration ? array( $text_decoration_class ) : array()660		);661		return implode( ' ', $classes );662	}