WP_HTML_Processor::create_fragment_at_current_node( string $html ): static|null

477	private function create_fragment_at_current_node( string $html ) {478		if ( $this->get_token_type() !== '#tag' || $this->is_tag_closer() ) {479			_doing_it_wrong(480				__METHOD__,481				__( 'The context element must be a start tag.' ),482				'6.8.0'483			);484			return null;485		}486 487		$tag_name  = $this->current_element->token->node_name;488		$namespace = $this->current_element->token->namespace;489 490		if ( 'html' === $namespace && self::is_void( $tag_name ) ) {491			_doing_it_wrong(492				__METHOD__,493				sprintf(494					// translators: %s: A tag name like INPUT or BR.495					__( 'The context element cannot be a void element, found "%s".' ),496					$tag_name497				),498				'6.8.0'499			);500			return null;501		}502 503		/*504		 * Prevent creating fragments at nodes that require a special tokenizer state.505		 * This is unsupported by the HTML Processor.506		 */507		if (508			'html' === $namespace &&509			in_array( $tag_name, array( 'IFRAME', 'NOEMBED', 'NOFRAMES', 'SCRIPT', 'STYLE', 'TEXTAREA', 'TITLE', 'XMP', 'PLAINTEXT' ), true )510		) {511			_doing_it_wrong(512				__METHOD__,513				sprintf(514					// translators: %s: A tag name like IFRAME or TEXTAREA.515					__( 'The context element "%s" is not supported.' ),516					$tag_name517				),518				'6.8.0'519			);520			return null;521		}522 523		$fragment_processor = new static( $html, self::CONSTRUCTOR_UNLOCK_CODE );524 525		$fragment_processor->compat_mode = $this->compat_mode;526 527		// @todo Create "fake" bookmarks for non-existent but implied nodes.528		$fragment_processor->bookmarks['root-node'] = new WP_HTML_Span( 0, 0 );529		$root_node                                  = new WP_HTML_Token(530			'root-node',531			'HTML',532			false533		);534		$fragment_processor->state->stack_of_open_elements->push( $root_node );535 536		$fragment_processor->bookmarks['context-node']   = new WP_HTML_Span( 0, 0 );537		$fragment_processor->context_node                = clone $this->current_element->token;538		$fragment_processor->context_node->bookmark_name = 'context-node';539		$fragment_processor->context_node->on_destroy    = null;540 541		$fragment_processor->breadcrumbs = array( 'HTML', $fragment_processor->context_node->node_name );542 543		if ( 'TEMPLATE' === $fragment_processor->context_node->node_name ) {544			$fragment_processor->state->stack_of_template_insertion_modes[] = WP_HTML_Processor_State::INSERTION_MODE_IN_TEMPLATE;545		}546 547		$fragment_processor->reset_insertion_mode_appropriately();548 549		/*550		 * > Set the parser's form element pointer to the nearest node to the context element that551		 * > is a form element (going straight up the ancestor chain, and including the element552		 * > itself, if it is a form element), if any. (If there is no such form element, the553		 * > form element pointer keeps its initial value, null.)554		 */555		foreach ( $this->state->stack_of_open_elements->walk_up() as $element ) {556			if ( 'FORM' === $element->node_name && 'html' === $element->namespace ) {