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

83function block_core_tabs_render_block_callback( array $attributes, string $content, \WP_Block $block ): string {84	$active_tab_index = $attributes['activeTabIndex'] ?? 0;85	$tabs_list        = $block->context['core/tabs-list'] ?? array();86	$tabs_id          = $block->context['core/tabs-id'] ?? null;87 88	if ( empty( $tabs_id ) ) {89		// If malformed tabs, return early to avoid errors.90		return '';91	}92 93	$tag_processor = new WP_HTML_Tag_Processor( $content );94 95	$tag_processor->next_tag( array( 'class_name' => 'wp-block-tabs' ) );96	$tag_processor->set_attribute( 'data-wp-interactive', 'core/tabs' );97 98	$tag_processor->set_attribute(99		'data-wp-context',100		wp_json_encode(101			array(102				'tabsId'         => $tabs_id,103				'activeTabIndex' => $active_tab_index,104			)105		)106	);107	$tag_processor->set_attribute( 'data-wp-init', 'callbacks.onTabsInit' );108	$tag_processor->set_attribute( 'data-wp-on--keydown', 'actions.handleTabKeyDown' );109 110	$output = $tag_processor->get_updated_html();111 112	/**113	 * Builds a client side state for just this tabs instance, so each114	 * core/tabs block manages its own state, like context.115	 */116	wp_interactivity_state(117		'core/tabs',118		array(119			$tabs_id => $tabs_list,120		)121	);122 123	return $output;124}