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function render_block_core_navigation( $attributes, $content, $block ) {
	static $seen_menu_names = array();

	// Flag used to indicate whether the rendered output is considered to be
	// a fallback (i.e. the block has no menu associated with it).
	$is_fallback = false;

	$nav_menu_name = $attributes['ariaLabel'] ?? '';

	/**
	 * Deprecated:
	 * The rgbTextColor and rgbBackgroundColor attributes
	 * have been deprecated in favor of
	 * customTextColor and customBackgroundColor ones.
	 * Move the values from old attrs to the new ones.
	 */
	if ( isset( $attributes['rgbTextColor'] ) && empty( $attributes['textColor'] ) ) {
		$attributes['customTextColor'] = $attributes['rgbTextColor'];
	}

	if ( isset( $attributes['rgbBackgroundColor'] ) && empty( $attributes['backgroundColor'] ) ) {
		$attributes['customBackgroundColor'] = $attributes['rgbBackgroundColor'];
	}

	unset( $attributes['rgbTextColor'], $attributes['rgbBackgroundColor'] );

	/**
	 * This is for backwards compatibility after `isResponsive` attribute has been removed.
	 */
	$has_old_responsive_attribute = ! empty( $attributes['isResponsive'] ) && $attributes['isResponsive'];
	$is_responsive_menu           = isset( $attributes['overlayMenu'] ) && 'never' !== $attributes['overlayMenu'] || $has_old_responsive_attribute;

	$inner_blocks = $block->inner_blocks;

	// Ensure that blocks saved with the legacy ref attribute name (navigationMenuId) continue to render.
	if ( array_key_exists( 'navigationMenuId', $attributes ) ) {
		$attributes['ref'] = $attributes['navigationMenuId'];
	}

	// If:
	// - the gutenberg plugin is active
	// - `__unstableLocation` is defined
	// - we have menu items at the defined location
	// - we don't have a relationship to a `wp_navigation` Post (via `ref`).
	// ...then create inner blocks from the classic menu assigned to that location.
	if (
		defined( 'IS_GUTENBERG_PLUGIN' ) && IS_GUTENBERG_PLUGIN &&
		array_key_exists( '__unstableLocation', $attributes ) &&
		! array_key_exists( 'ref', $attributes ) &&
		! empty( block_core_navigation_get_menu_items_at_location( $attributes['__unstableLocation'] ) )
	) {
		$menu_items = block_core_navigation_get_menu_items_at_location( $attributes['__unstableLocation'] );
		if ( empty( $menu_items ) ) {
			return '';
		}

		$menu_items_by_parent_id = block_core_navigation_sort_menu_items_by_parent_id( $menu_items );
		$parsed_blocks           = block_core_navigation_parse_blocks_from_menu_items( $menu_items_by_parent_id[0], $menu_items_by_parent_id );
		$inner_blocks            = new WP_Block_List( $parsed_blocks, $attributes );
	}

	// Load inner blocks from the navigation post.
	if ( array_key_exists( 'ref', $attributes ) ) {
		$navigation_post = get_post( $attributes['ref'] );
		if ( ! isset( $navigation_post ) ) {
			return '';
		}

		// Only published posts are valid. If this is changed then a corresponding change
		// must also be implemented in `use-navigation-menu.js`.
		if ( 'publish' === $navigation_post->post_status ) {
			$nav_menu_name = $navigation_post->post_title;

			if ( isset( $seen_menu_names[ $nav_menu_name ] ) ) {
				++$seen_menu_names[ $nav_menu_name ];
			} else {
				$seen_menu_names[ $nav_menu_name ] = 1;
			}

			$parsed_blocks = parse_blocks( $navigation_post->post_content );

			// 'parse_blocks' includes a null block with '\n\n' as the content when
			// it encounters whitespace. This code strips it.
			$compacted_blocks = block_core_navigation_filter_out_empty_blocks( $parsed_blocks );

			// TODO - this uses the full navigation block attributes for the
			// context which could be refined.
			$inner_blocks = new WP_Block_List( $compacted_blocks, $attributes );
		}
	}

	// If there are no inner blocks then fallback to rendering an appropriate fallback.
	if ( empty( $inner_blocks ) ) {
		$is_fallback = true; // indicate we are rendering the fallback.

		$fallback_blocks = block_core_navigation_get_fallback_blocks();

		// Fallback my have been filtered so do basic test for validity.
		if ( empty( $fallback_blocks ) || ! is_array( $fallback_blocks ) ) {
			return '';
		}

		$inner_blocks = new WP_Block_List( $fallback_blocks, $attributes );
	}

	if ( block_core_navigation_block_contains_core_navigation( $inner_blocks ) ) {
		return '';
	}

	/**
	 * Filter navigation block $inner_blocks.
	 * Allows modification of a navigation block menu items.
	 *
	 * @since 6.1.0
	 *
	 * @param \WP_Block_List $inner_blocks
	 */
	$inner_blocks = apply_filters( 'block_core_navigation_render_inner_blocks', $inner_blocks );

	$layout_justification = array(
		'left'          => 'items-justified-left',
		'right'         => 'items-justified-right',
		'center'        => 'items-justified-center',
		'space-between' => 'items-justified-space-between',
	);

	// Restore legacy classnames for submenu positioning.
	$layout_class = '';
	if (
		isset( $attributes['layout']['justifyContent'] ) &&
		isset( $layout_justification[ $attributes['layout']['justifyContent'] ] )
	) {
		$layout_class .= $layout_justification[ $attributes['layout']['justifyContent'] ];
	}
	if ( isset( $attributes['layout']['orientation'] ) && 'vertical' === $attributes['layout']['orientation'] ) {
		$layout_class .= ' is-vertical';
	}

	if ( isset( $attributes['layout']['flexWrap'] ) && 'nowrap' === $attributes['layout']['flexWrap'] ) {
		$layout_class .= ' no-wrap';
	}

	// Manually add block support text decoration as CSS class.
	$text_decoration       = $attributes['style']['typography']['textDecoration'] ?? null;
	$text_decoration_class = sprintf( 'has-text-decoration-%s', $text_decoration );

	$colors     = block_core_navigation_build_css_colors( $attributes );
	$font_sizes = block_core_navigation_build_css_font_sizes( $attributes );
	$classes    = array_merge(
		$colors['css_classes'],
		$font_sizes['css_classes'],
		$is_responsive_menu ? array( 'is-responsive' ) : array(),
		$layout_class ? array( $layout_class ) : array(),
		$is_fallback ? array( 'is-fallback' ) : array(),
		$text_decoration ? array( $text_decoration_class ) : array()
	);

	$post_ids = block_core_navigation_get_post_ids( $inner_blocks );
	if ( $post_ids ) {
		_prime_post_caches( $post_ids, false, false );
	}

	$list_item_nav_blocks = array(
		'core/navigation-link',
		'core/home-link',
		'core/site-title',
		'core/site-logo',
		'core/navigation-submenu',
	);

	$needs_list_item_wrapper = array(
		'core/site-title',
		'core/site-logo',
	);

	$block_styles = isset( $attributes['styles'] ) ? $attributes['styles'] : '';
	$style        = $block_styles . $colors['inline_styles'] . $font_sizes['inline_styles'];
	$class        = implode( ' ', $classes );

	// If the menu name has been used previously then append an ID
	// to the name to ensure uniqueness across a given post.
	if ( isset( $seen_menu_names[ $nav_menu_name ] ) && $seen_menu_names[ $nav_menu_name ] > 1 ) {
		$count         = $seen_menu_names[ $nav_menu_name ];
		$nav_menu_name = $nav_menu_name . ' ' . ( $count );
	}

	$wrapper_attributes = get_block_wrapper_attributes(
		array(
			'class'      => $class,
			'style'      => $style,
			'aria-label' => $nav_menu_name,
		)
	);

	$container_attributes = get_block_wrapper_attributes(
		array(
			'class' => 'wp-block-navigation__container ' . $class,
			'style' => $style,
		)
	);

	$inner_blocks_html = '';
	$is_list_open      = false;
	$has_submenus      = false;
	foreach ( $inner_blocks as $inner_block ) {
		$is_list_item = in_array( $inner_block->name, $list_item_nav_blocks, true );

		if ( $is_list_item && ! $is_list_open ) {
			$is_list_open       = true;
			$inner_blocks_html .= sprintf(
				'<ul %1$s>',
				$container_attributes
			);
		}

		if ( ! $is_list_item && $is_list_open ) {
			$is_list_open       = false;
			$inner_blocks_html .= '</ul>';
		}

		$inner_block_content = $inner_block->render();
		$p                   = new WP_HTML_Tag_Processor( $inner_block_content );
		if ( $p->next_tag(
			array(
				'name'       => 'LI',
				'class_name' => 'has-child',
			)
		) ) {
			$has_submenus = true;
		}
		if ( ! empty( $inner_block_content ) ) {
			if ( in_array( $inner_block->name, $needs_list_item_wrapper, true ) ) {
				$inner_blocks_html .= '<li class="wp-block-navigation-item">' . $inner_block_content . '</li>';
			} else {
				$inner_blocks_html .= $inner_block_content;
			}
		}
	}

	if ( $is_list_open ) {
		$inner_blocks_html .= '</ul>';
	}

	$should_load_view_script = ( $has_submenus && ( $attributes['openSubmenusOnClick'] || $attributes['showSubmenuIcon'] ) ) || $is_responsive_menu;
	$view_js_file            = 'wp-block-navigation-view';

	// If the script already exists, there is no point in removing it from viewScript.
	if ( ! wp_script_is( $view_js_file ) ) {
		$script_handles = $block->block_type->view_script_handles;

		// If the script is not needed, and it is still in the `view_script_handles`, remove it.
		if ( ! $should_load_view_script && in_array( $view_js_file, $script_handles, true ) ) {
			$block->block_type->view_script_handles = array_diff( $script_handles, array( $view_js_file ) );
		}
		// If the script is needed, but it was previously removed, add it again.
		if ( $should_load_view_script && ! in_array( $view_js_file, $script_handles, true ) ) {
			$block->block_type->view_script_handles = array_merge( $script_handles, array( $view_js_file ) );
		}
	}

	// Add directives to the submenu if needed.
	if ( $has_submenus && $should_load_view_script ) {
		$w                 = new WP_HTML_Tag_Processor( $inner_blocks_html );
		$inner_blocks_html = block_core_navigation_add_directives_to_submenu( $w, $attributes );
	}

	$modal_unique_id = wp_unique_id( 'modal-' );

	// Determine whether or not navigation elements should be wrapped in the markup required to make it responsive,
	// return early if they don't.
	if ( ! $is_responsive_menu ) {
		return sprintf(
			'<nav %1$s>%2$s</nav>',
			$wrapper_attributes,
			$inner_blocks_html
		);
	}

	$is_hidden_by_default = isset( $attributes['overlayMenu'] ) && 'always' === $attributes['overlayMenu'];

	$responsive_container_classes = array(
		'wp-block-navigation__responsive-container',
		$is_hidden_by_default ? 'hidden-by-default' : '',
		implode( ' ', $colors['overlay_css_classes'] ),
	);
	$open_button_classes          = array(
		'wp-block-navigation__responsive-container-open',
		$is_hidden_by_default ? 'always-shown' : '',
	);

	$should_display_icon_label = isset( $attributes['hasIcon'] ) && true === $attributes['hasIcon'];
	$toggle_button_icon        = '<svg width="24" height="24" xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24" aria-hidden="true" focusable="false"><rect x="4" y="7.5" width="16" height="1.5" /><rect x="4" y="15" width="16" height="1.5" /></svg>';
	if ( isset( $attributes['icon'] ) ) {
		if ( 'menu' === $attributes['icon'] ) {
			$toggle_button_icon = '<svg width="24" height="24" xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24"><path d="M5 5v1.5h14V5H5zm0 7.8h14v-1.5H5v1.5zM5 19h14v-1.5H5V19z" /></svg>';
		}
	}
	$toggle_button_content       = $should_display_icon_label ? $toggle_button_icon : __( 'Menu' );
	$toggle_close_button_icon    = '<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24" width="24" height="24" aria-hidden="true" focusable="false"><path d="M13 11.8l6.1-6.3-1-1-6.1 6.2-6.1-6.2-1 1 6.1 6.3-6.5 6.7 1 1 6.5-6.6 6.5 6.6 1-1z"></path></svg>';
	$toggle_close_button_content = $should_display_icon_label ? $toggle_close_button_icon : __( 'Close' );
	$toggle_aria_label_open      = $should_display_icon_label ? 'aria-label="' . __( 'Open menu' ) . '"' : ''; // Open button label.
	$toggle_aria_label_close     = $should_display_icon_label ? 'aria-label="' . __( 'Close menu' ) . '"' : ''; // Close button label.

	// Add Interactivity API directives to the markup if needed.
	$nav_element_directives          = '';
	$open_button_directives          = '';
	$responsive_container_directives = '';
	$responsive_dialog_directives    = '';
	$close_button_directives         = '';
	if ( $should_load_view_script ) {
		$nav_element_directives          = '
			data-wp-interactive
			data-wp-context=\'{ "core": { "navigation": { "overlayOpenedBy": {}, "type": "overlay", "roleAttribute": "" } } }\'
		';
		$open_button_directives          = '
			data-wp-on--click="actions.core.navigation.openMenuOnClick"
			data-wp-on--keydown="actions.core.navigation.handleMenuKeydown"
		';
		$responsive_container_directives = '
			data-wp-class--has-modal-open="selectors.core.navigation.isMenuOpen"
			data-wp-class--is-menu-open="selectors.core.navigation.isMenuOpen"
			data-wp-effect="effects.core.navigation.initMenu"
			data-wp-on--keydown="actions.core.navigation.handleMenuKeydown"
			data-wp-on--focusout="actions.core.navigation.handleMenuFocusout"
			tabindex="-1"
		';
		$responsive_dialog_directives    = '
			data-wp-bind--aria-modal="selectors.core.navigation.ariaModal"
			data-wp-bind--role="selectors.core.navigation.roleAttribute"
			data-wp-effect="effects.core.navigation.focusFirstElement"
		';
		$close_button_directives         = '
			data-wp-on--click="actions.core.navigation.closeMenuOnClick"
		';
	}

	$responsive_container_markup = sprintf(
		'<button aria-haspopup="true" %3$s class="%6$s" %11$s>%9$s</button>
			<div class="%5$s" style="%7$s" id="%1$s" %12$s>
				<div class="wp-block-navigation__responsive-close" tabindex="-1">
					<div class="wp-block-navigation__responsive-dialog" aria-label="%8$s" %13$s>
							<button %4$s class="wp-block-navigation__responsive-container-close" %14$s>%10$s</button>
						<div class="wp-block-navigation__responsive-container-content" id="%1$s-content">
							%2$s
						</div>
					</div>
				</div>
			</div>',
		esc_attr( $modal_unique_id ),
		$inner_blocks_html,
		$toggle_aria_label_open,
		$toggle_aria_label_close,
		esc_attr( implode( ' ', $responsive_container_classes ) ),
		esc_attr( implode( ' ', $open_button_classes ) ),
		esc_attr( safecss_filter_attr( $colors['overlay_inline_styles'] ) ),
		__( 'Menu' ),
		$toggle_button_content,
		$toggle_close_button_content,
		$open_button_directives,
		$responsive_container_directives,
		$responsive_dialog_directives,
		$close_button_directives
	);

	return sprintf(
		'<nav %1$s %3$s>%2$s</nav>',
		$wrapper_attributes,
		$responsive_container_markup,
		$nav_element_directives
	);
}