WP_HTML_Processor::reset_insertion_mode_appropriately()

5988	private function reset_insertion_mode_appropriately(): void {5989		// Set the first node.5990		$first_node = null;5991		foreach ( $this->state->stack_of_open_elements->walk_down() as $first_node ) {5992			break;5993		}5994 5995		/*5996		 * > 1. Let _last_ be false.5997		 */5998		$last = false;5999		foreach ( $this->state->stack_of_open_elements->walk_up() as $node ) {6000			/*6001			 * > 2. Let _node_ be the last node in the stack of open elements.6002			 * > 3. _Loop_: If _node_ is the first node in the stack of open elements, then set _last_6003			 * >            to true, and, if the parser was created as part of the HTML fragment parsing6004			 * >            algorithm (fragment case), set node to the context element passed to6005			 * >            that algorithm.6006			 * > …6007			 */6008			if ( $node === $first_node ) {6009				$last = true;6010				if ( isset( $this->context_node ) ) {6011					$node = $this->context_node;6012				}6013			}6014 6015			// All of the following rules are for matching HTML elements.6016			if ( 'html' !== $node->namespace ) {6017				continue;6018			}6019 6020			switch ( $node->node_name ) {6021				/*6022				 * > 4. If node is a `select` element, run these substeps:6023				 * >   1. If _last_ is true, jump to the step below labeled done.6024				 * >   2. Let _ancestor_ be _node_.6025				 * >   3. _Loop_: If _ancestor_ is the first node in the stack of open elements,6026				 * >      jump to the step below labeled done.6027				 * >   4. Let ancestor be the node before ancestor in the stack of open elements.6028				 * >   …6029				 * >   7. Jump back to the step labeled _loop_.6030				 * >   8. _Done_: Switch the insertion mode to "in select" and return.6031				 */6032				case 'SELECT':6033					if ( ! $last ) {6034						foreach ( $this->state->stack_of_open_elements->walk_up( $node ) as $ancestor ) {6035							if ( 'html' !== $ancestor->namespace ) {6036								continue;6037							}6038 6039							switch ( $ancestor->node_name ) {6040								/*6041								 * > 5. If _ancestor_ is a `template` node, jump to the step below6042								 * >    labeled _done_.6043								 */6044								case 'TEMPLATE':6045									break 2;6046 6047								/*6048								 * > 6. If _ancestor_ is a `table` node, switch the insertion mode to6049								 * >    "in select in table" and return.6050								 */6051								case 'TABLE':6052									$this->state->insertion_mode = WP_HTML_Processor_State::INSERTION_MODE_IN_SELECT_IN_TABLE;6053									return;6054							}6055						}6056					}6057					$this->state->insertion_mode = WP_HTML_Processor_State::INSERTION_MODE_IN_SELECT;6058					return;6059 6060				/*6061				 * > 5. If _node_ is a `td` or `th` element and _last_ is false, then switch the6062				 * >    insertion mode to "in cell" and return.6063				 */6064				case 'TD':6065				case 'TH':6066					if ( ! $last ) {6067						$this->state->insertion_mode = WP_HTML_Processor_State::INSERTION_MODE_IN_CELL;