block_core_tab_list_render_callback( array $attributes, string $content, WP_Block $block ): string

24function block_core_tab_list_render_callback( array $attributes, string $content, \WP_Block $block ): string {25	$tabs_list  = $block->context['core/tabs-list'] ?? array();26	$aria_label = empty( $attributes['ariaLabel'] ) ? __( 'Tabbed content' ) : wp_strip_all_tags( $attributes['ariaLabel'] );27 28	$tag_processor = new WP_HTML_Tag_Processor( $content );29	if ( $tag_processor->next_tag( array( 'class_name' => 'wp-block-tab-list' ) ) ) {30		$tag_processor->set_attribute( 'aria-label', $aria_label );31	}32 33	if ( empty( $tabs_list ) ) {34		return $tag_processor->get_updated_html();35	}36 37	$tab_index = 0;38 39	while ( $tag_processor->next_tag( 'button' ) ) {40		$tab_id = $tabs_list[ $tab_index ] ?? null;41 42		if ( null === $tab_id ) {43			break;44		}45 46		$tag_processor->set_attribute( 'id', 'tab__' . $tab_id );47		$tag_processor->set_attribute( 'aria-controls', $tab_id );48		$tag_processor->set_attribute( 'data-wp-on--click', 'actions.handleTabClick' );49		$tag_processor->set_attribute( 'data-wp-on--keydown', 'actions.handleTabKeyDown' );50		$tag_processor->set_attribute( 'data-wp-bind--aria-selected', 'state.isActiveTab' );51		$tag_processor->set_attribute( 'data-wp-bind--tabindex', 'state.tabIndexAttribute' );52		$tag_processor->set_attribute(53			'data-wp-context',54			wp_json_encode( array( 'tabIndex' => $tab_index ) )55		);56 57		++$tab_index;58	}59 60	return $tag_processor->get_updated_html();61}