WP_HTML_Processor::reset_insertion_mode_appropriately()

5946	private function reset_insertion_mode_appropriately(): void {5947		// Set the first node.5948		$first_node = null;5949		foreach ( $this->state->stack_of_open_elements->walk_down() as $first_node ) {5950			break;5951		}5952 5953		/*5954		 * > 1. Let _last_ be false.5955		 */5956		$last = false;5957		foreach ( $this->state->stack_of_open_elements->walk_up() as $node ) {5958			/*5959			 * > 2. Let _node_ be the last node in the stack of open elements.5960			 * > 3. _Loop_: If _node_ is the first node in the stack of open elements, then set _last_5961			 * >            to true, and, if the parser was created as part of the HTML fragment parsing5962			 * >            algorithm (fragment case), set node to the context element passed to5963			 * >            that algorithm.5964			 * > …5965			 */5966			if ( $node === $first_node ) {5967				$last = true;5968				if ( isset( $this->context_node ) ) {5969					$node = $this->context_node;5970				}5971			}5972 5973			// All of the following rules are for matching HTML elements.5974			if ( 'html' !== $node->namespace ) {5975				continue;5976			}5977 5978			switch ( $node->node_name ) {5979				/*5980				 * > 4. If _node_ is a `td` or `th` element and _last_ is false, then switch the5981				 * >    insertion mode to "in cell" and return.5982				 */5983				case 'TD':5984				case 'TH':5985					if ( ! $last ) {5986						$this->state->insertion_mode = WP_HTML_Processor_State::INSERTION_MODE_IN_CELL;5987						return;5988					}5989					break;5990 5991				/*5992				* > 5. If _node_ is a `tr` element, then switch the insertion mode to "in row"5993				* >    and return.5994				*/5995				case 'TR':5996					$this->state->insertion_mode = WP_HTML_Processor_State::INSERTION_MODE_IN_ROW;5997					return;5998 5999				/*6000				 * > 6. If _node_ is a `tbody`, `thead`, or `tfoot` element, then switch the6001				 * >    insertion mode to "in table body" and return.6002				 */6003				case 'TBODY':6004				case 'THEAD':6005				case 'TFOOT':6006					$this->state->insertion_mode = WP_HTML_Processor_State::INSERTION_MODE_IN_TABLE_BODY;6007					return;6008 6009				/*6010				 * > 7. If _node_ is a `caption` element, then switch the insertion mode to6011				 * >    "in caption" and return.6012				 */6013				case 'CAPTION':6014					$this->state->insertion_mode = WP_HTML_Processor_State::INSERTION_MODE_IN_CAPTION;6015					return;6016 6017				/*6018				 * > 8. If _node_ is a `colgroup` element, then switch the insertion mode to6019				 * >    "in column group" and return.6020				 */6021				case 'COLGROUP':6022					$this->state->insertion_mode = WP_HTML_Processor_State::INSERTION_MODE_IN_COLUMN_GROUP;6023					return;6024 6025				/*