lements->current_node_is( 'FORM' ) ) {
						// @todo Indicate a parse error once it's possible. This error does not impact the logic here.
					}

					$this->state->stack_of_open_elements->pop_until( 'FORM' );
					return true;
				}
				break;

			/*
			 * > An end tag whose tag name is "p"
			 */
			case '-P':
				if ( ! $this->state->stack_of_open_elements->has_p_in_button_scope() ) {
					$this->insert_html_element( $this->state->current_token );
				}

				$this->close_a_p_element();
				return true;

			/*
			 * > An end tag whose tag name is "li"
			 * > An end tag whose tag name is one of: "dd", "dt"
			 */
			case '-DD':
			case '-DT':
			case '-LI':
				if (
					/*
					 * An end tag whose tag name is "li":
					 * If the stack of open elements does not have an li element in list item scope,
					 * then this is a parse error; ignore the token.
					 */
					(
						'LI' === $token_name &&
						! $this->state->stack_of_open_elements->has_element_in_list_item_scope( 'LI' )
					) ||
					/*
					 * An end tag whose tag name is one of: "dd", "dt":
					 * If the stack of open elements does not have an element in scope that is an
					 * HTML element with the same tag name as that of the token, then this is a
					 * parse error; ignore the token.
					 */
					(
						'LI' !== $token_name &&
						! $this->state->stack_of_open_elements->has_element_in_scope( $token_name )
					)
				) {
					/*
					 * This is a parse error, ignore the token.
					 *
					 * @todo Indicate a parse error once it's possible.
					 */
					return $this->step();
				}

				$this->generate_implied_end_tags( $token_name );

				if ( ! $this->state->stack_of_open_elements->current_node_is( $token_name ) ) {
					// @todo Indicate a parse error once it's possible. This error does not impact the logic here.
				}

				$this->state->stack_of_open_elements->pop_until( $token_name );
				return true;

			/*
			 * > An end tag whose tag name is one of: "h1", "h2", "h3", "h4", "h5", "h6"
			 */
			case '-H1':
			case '-H2':
			case '-H3':
			case '-H4':
			case '-H5':
			case '-H6':
				if ( ! $this->state->stack_of_open_elements->has_element_in_scope( '(internal: H1 through H6 - do not use)' ) ) {
					/*
					 * This is a parse error; ignore the token.
					 *
					 * @todo Indicate a parse error once it's possible.
					 */
					return $this->step();
				}

				$this->generate_implied_end_tags();

				if ( ! $this->state->stack_of_open_elements->current_node_is( $token_name ) ) {
					// @todo Record parse error: this error doesn't impact parsing.
				}

				$this->state->stack_of_open_elements->pop_until( '(internal: H1 through H6 - do not use)' );
				return true;

			/*
			 * > A start tag whose tag name is "a"
			 */
			case '+A':
				foreach ( $this->state->active_formatting_elements->walk_up() as $item ) {
					switch ( $item->node_name ) {
						case 'marker':
							break 2;

						case 'A':
							$this->run_adoption_agency_algorithm();
							$this->state->active_formatting_elements->remove_node( $item );
							$this->state->stack_of_open_elements->remove_node( $item );
							break 2;
					}
				}

				$this->reconstruct_active_formatting_elements();
				$this->insert_html_element( $this->state->current_token );
				$this->state->active_formatting_elements->push( $this->state->current_token );
				return true;

			/*
			 * > A start tag whose tag name is one of: "b", "big", "code", "em", "font", "i",
			 * > "s", "small", "strike", "strong", "tt", "u"
			 */
			case '+B':
			case '+BIG':
			case '+CODE':
			case '+EM':
			case '+FONT':
			case '+I':
			case '+S':
			case '+SMALL':
			case '+STRIKE':
			case '+STRONG':
			case '+TT':
			case '+U':
				$this->reconstruct_active_formatting_elements();
				$this->insert_html_element( $this->state->current_token );
				$this->state->active_formatting_elements->push( $this->state->current_token );
				return true;

			/*
			 * > A start tag whose tag name is "nobr"
			 */
			case '+NOBR':
				$this->reconstruct_active_formatting_elements();

				if ( $this->state->stack_of_open_elements->has_element_in_scope( 'NOBR' ) ) {
					// Parse error.
					$this->run_adoption_agency_algorithm();
					$this->reconstruct_active_formatting_elements();
				}

				$this->insert_html_element( $this->state->current_token );
				$this->state->active_formatting_elements->push( $this->state->current_token );
				return true;

			/*
			 * > An end tag whose tag name is one of: "a", "b", "big", "code", "em", "font", "i",
			 * > "nobr", "s", "small", "strike", "strong", "tt", "u"
			 */
			case '-A':
			case '-B':
			case '-BIG':
			case '-CODE':
			case '-EM':
			case '-FONT':
			case '-I':
			case '-NOBR':
			case '-S':
			case '-SMALL':
			case '-STRIKE':
			case '-STRONG':
			case '-TT':
			case '-U':
				$this->run_adoption_agency_algorithm();
				return true;

			/*
			 * > A start tag whose tag name is one of: "applet", "marquee", "object"
			 */
			case '+APPLET':
			case '+MARQUEE':
			case '+OBJECT':
				$this->reconstruct_active_formatting_elements();
				$this->insert_html_element( $this->state->current_token );
				$this->state->active_formatting_elements->insert_marker();
				$this->state->frameset_ok = false;
				return true;

			/*
			 * > A end tag token whose tag name is one of: "applet", "marquee", "object"
			 */
			case '-APPLET':
			case '-MARQUEE':
			case '-OBJECT':
				if ( ! $this->state->stack_of_open_elements->has_element_in_scope( $token_name ) ) {
					// Parse error: ignore the token.
					return $this->step();
				}

				$this->generate_implied_end_tags();
				if ( ! $this->state->stack_of_open_elements->current_node_is( $token_name ) ) {
					// This is a parse error.
				}

				$this->state->stack_of_open_elements->pop_until( $token_name );
				$this->state->active_formatting_elements->clear_up_to_last_marker();
				return true;

			/*
			 * > A start tag whose tag name is "table"
			 */
			case '+TABLE':
				/*
				 * > If the Document is not set to quirks mode, and the stack of open elements
				 * > has a p element in button scope, then close a p element.
				 */
				if (
					WP_HTML_Tag_Processor::QUIRKS_MODE !== $this->compat_mode &&
					$this->state->stack_of_open_elements->has_p_in_button_scope()
				) {
					$this->close_a_p_element();
				}

				$this->insert_html_element( $this->state->current_token );
				$this->state->frameset_ok    = false;
				$this->state->insertion_mode = WP_HTML_Processor_State::INSERTION_MODE_IN_TABLE;
				return true;

			/*
			 * > An end tag whose tag name is "br"
			 *
			 * This is prevented from happening because the Tag Processor
			 * reports all closing BR tags as if they were opening tags.
			 */

			/*
			 * > A start tag whose tag name is one of: "area", "br", "embed", "img", "keygen", "wbr"
			 */
			case '+AREA':
			case '+BR':
			case '+EMBED':
			case '+IMG':
			case '+KEYGEN':
			case '+WBR':
				$this->reconstruct_active_formatting_elements();
				$this->insert_html_element( $this->state->current_token );
				$this->state->frameset_ok = false;
				return true;

			/*
			 * > A start tag whose tag name is "input"
			 */
			case '+INPUT':
				$this->reconstruct_active_formatting_elements();
				$this->insert_html_element( $this->state->current_token );

				/*
				 * > If the token does not have an attribute with the name "type", or if it does,
				 * > but that attribute's value is not an ASCII case-insensitive match for the
				 * > string "hidden", then: set the frameset-ok flag to "not ok".
				 */
				$type_attribute = $this->get_attribute( 'type' );
				if ( ! is_string( $type_attribute ) || 'hidden' !== strtolower( $type_attribute ) ) {
					$this->state->frameset_ok = false;
				}

				return true;

			/*
			 * > A start tag whose tag name is one of: "param", "source", "track"
			 */
			case '+PARAM':
			case '+SOURCE':
			case '+TRACK':
				$this->insert_html_element( $this->state->current_token );
				return true;

			/*
			 * > A start tag whose tag name is "hr"
			 */
			case '+HR':
				if ( $this->state->stack_of_open_elements->has_p_in_button_scope() ) {
					$this->close_a_p_element();
				}
				$this->insert_html_element( $this->state->current_token );
				$this->state->frameset_ok = false;
				return true;

			/*
			 * > A start tag whose tag name is "image"
			 */
			case '+IMAGE':
				/*
				 * > Parse error. Change the token's tag name to "img" and reprocess it. (Don't ask.)
				 *
				 * Note that this is handled elsewhere, so it should not be possible to reach this code.
				 */
				$this->bail( "Cannot process an IMAGE tag. (Don't ask.)" );
				break;

			/*
			 * > A start tag whose tag name is "textarea"
			 */
			case '+TEXTAREA':
				$this->insert_html_element( $this->state->current_token );

				/*
				 * > If the next token is a U+000A LINE FEED (LF) character token, then ignore
				 * > that token and move on to the next one. (Newlines at the start of
				 * > textarea elements are ignored as an authoring convenience.)
				 *
				 * This is handled in `get_modifiable_text()`.
				 */

				$this->state->frameset_ok = false;

				/*
				 * > Switch the insertion mode to "text".
				 *
				 * As a self-contained node, this behavior is handled in the Tag Processor.
				 */
				return true;

			/*
			 * > A start tag whose tag name is "xmp"
			 */
			case '+XMP':
				if ( $this->state->stack_of_open_elements->has_p_in_button_scope() ) {
					$this->close_a_p_element();
				}

				$this->reconstruct_active_formatting_elements();
				$this->state->frameset_ok = false;

				/*
				 * > Follow the generic raw text element parsing algorithm.
				 *
				 * As a self-contained node, this behavior is handled in the Tag Processor.
				 */
				$this->insert_html_element( $this->state->current_token );
				return true;

			/*
			 * A start tag whose tag name is "iframe"
			 */
			case '+IFRAME':
				$this->state->frameset_ok = false;

				/*
				 * > Follow the generic raw text element parsing algorithm.
				 *
				 * As a self-contained node, this behavior is handled in the Tag Processor.
				 */
				$this->insert_html_element( $this->state->current_token );
				return true;

			/*
			 * > A start tag whose tag name is "noembed"
			 * > A start tag whose tag name is "noscript", if the scripting flag is enabled
			 *
			 * The scripting flag is never enabled in this parser.
			 */
			case '+NOEMBED':
				$this->insert_html_element( $this->state->current_token );
				return true;

			/*
			 * > A start tag whose tag name is "select"
			 */
			case '+SELECT':
				$this->reconstruct_active_formatting_elements();
				$this->insert_html_element( $this->state->current_token );
				$this->state->frameset_ok = false;

				switch ( $this->state->insertion_mode ) {
					/*
					 * > If the insertion mode is one of "in table", "in caption", "in table body", "in row",
					 * > or "in cell", then switch the insertion mode to "in select in table".
					 */
					case WP_HTML_Processor_State::INSERTION_MODE_IN_TABLE:
					case WP_HTML_Processor_State::INSERTION_MODE_IN_CAPTION:
					case WP_HTML_Processor_State::INSERTION_MODE_IN_TABLE_BODY:
					case WP_HTML_Processor_State::INSERTION_MODE_IN_ROW:
					case WP_HTML_Processor_State::INSERTION_MODE_IN_CELL:
						$this->state->insertion_mode = WP_HTML_Processor_State::INSERTION_MODE_IN_SELECT_IN_TABLE;
						break;

					/*
					 * > Otherwise, switch the insertion mode to "in select".
					 */
					default:
						$this->state->insertion_mode = WP_HTML_Processor_State::INSERTION_MODE_IN_SELECT;
						break;
				}
				return true;

			/*
			 * > A start tag whose tag name is one of: "optgroup", "option"
			 */
			case '+OPTGROUP':
			case '+OPTION':
				if ( $this->state->stack_of_open_elements->current_node_is( 'OPTION' ) ) {
					$this->state->stack_of_open_elements->pop();
				}
				$this->reconstruct_active_formatting_elements();
				$this->insert_html_element( $this->state->current_token );
				return true;

			/*
			 * > A start tag whose tag name is one of: "rb", "rtc"
			 */
			case '+RB':
			case '+RTC':
				if ( $this->state->stack_of_open_elements->has_element_in_scope( 'RUBY' ) ) {
					$this->generate_implied_end_tags();

					if ( $this->state->stack_of_open_elements->current_node_is( 'RUBY' ) ) {
						// @todo Indicate a parse error once it's possible.
					}
				}

				$this->insert_html_element( $this->state->current_token );
				return true;

			/*
			 * > A start tag whose tag name is one of: "rp", "rt"
			 */
			case '+RP':
			case '+RT':
				if ( $this->state->stack_of_open_elements->has_element_in_scope( 'RUBY' ) ) {
					$this->generate_implied_end_tags( 'RTC' );

					$current_node_name = $this->state->stack_of_open_elements->current_node()->node_name;
					if ( 'RTC' === $current_node_name || 'RUBY' === $current_node_name ) {
						// @todo Indicate a parse error once it's possible.
					}
				}

				$this->insert_html_element( $this->state->current_token );
				return true;

			/*
			 * > A start tag whose tag name is "math"
			 */
			case '+MATH':
				$this->reconstruct_active_formatting_elements();

				/*
				 * @todo Adjust MathML attributes for the token. (This fixes the case of MathML attributes that are not all lowercase.)
				 * @todo Adjust foreign attributes for the token. (This fixes the use of namespaced attributes, in particular XLink.)
				 *
				 * These ought to be handled in the attribute methods.
				 */
				$this->state->current_token->namespace = 'math';
				$this->insert_html_element( $this->state->current_token );
				if ( $this->state->current_token->has_self_closing_flag ) {
					$this->state->stack_of_open_elements->pop();
				}
				return true;

			/*
			 * > A start tag whose tag name is "svg"
			 */
			case '+SVG':
				$this->reconstruct_active_formatting_elements();

				/*
				 * @todo Adjust SVG attributes for the token. (This fixes the case of SVG attributes that are not all lowercase.)
				 * @todo Adjust foreign attributes for the token. (This fixes the use of namespaced attributes, in particular XLink in SVG.)
				 *
				 * These ought to be handled in the attribute methods.
				 */
				$this->state->current_token->namespace = 'svg';
				$this->insert_html_element( $this->state->current_token );
				if ( $this->state->current_token->has_self_closing_flag ) {
					$this->state->stack_of_open_elements->pop();
				}
				return true;

			/*
			 * > A start tag whose tag name is one of: "caption", "col", "colgroup",
			 * > "frame", "head", "tbody", "td", "tfoot", "th", "thead", "tr"
			 */
			case '+CAPTION':
			case '+COL':
			case '+COLGROUP':
			case '+FRAME':
			case '+HEAD':
			case '+TBODY':
			case '+TD':
			case '+TFOOT':
			case '+TH':
			case '+THEAD':
			case '+TR':
				// Parse error. Ignore the token.
				return $this->step();
		}

		if ( ! parent::is_tag_closer() ) {
			/*
			 * > Any other start tag
			 */
			$this->reconstruct_active_formatting_elements();
			$this->insert_html_element( $this->state->current_token );
			return true;
		} else {
			/*
			 * > Any other end tag
			 */

			/*
			 * Find the corresponding tag opener in the stack of open elements, if
			 * it exists before reaching a special element, which provides a kind
			 * of boundary in the stack. For example, a `</custom-tag>` should not
			 * close anything beyond its containing `P` or `DIV` element.
			 */
			foreach ( $this->state->stack_of_open_elements->walk_up() as $node ) {
				if ( 'html' === $node->namespace && $token_name === $node->node_name ) {
					break;
				}

				if ( self::is_special( $node ) ) {
					// This is a parse error, ignore the token.
					return $this->step();
				}
			}

			$this->generate_implied_end_tags( $token_name );
			if ( $node !== $this->state->stack_of_open_elements->current_node() ) {
				// @todo Record parse error: this error doesn't impact parsing.
			}

			foreach ( $this->state->stack_of_open_elements->walk_up() as $item ) {
				$this->state->stack_of_open_elements->pop();
				if ( $node === $item ) {
					return true;
				}
			}
		}

		$this->bail( 'Should not have been able to reach end of IN BODY processing. Check HTML API code.' );
		// This unnecessary return prevents tools from inaccurately reporting type errors.
		return false;
	}

	/**
	 * Parses next element in the 'in table' insertion mode.
	 *
	 * This internal function performs the 'in table' insertion mode
	 * logic for the generalized WP_HTML_Processor::step() function.
	 *
	 * @since 6.7.0
	 *
	 * @throws WP_HTML_Unsupported_Exception When encountering unsupported HTML input.
	 *
	 * @see https://html.spec.whatwg.org/#parsing-main-intable
	 * @see WP_HTML_Processor::step
	 *
	 * @return bool Whether an element was found.
	 */
	private function step_in_table(): bool {
		$token_name = $this->get_token_name();
		$token_type = $this->get_token_type();
		$op_sigil   = '#tag' === $token_type ? ( parent::is_tag_closer() ? '-' : '+' ) : '';
		$op         = "{$op_sigil}{$token_name}";

		switch ( $op ) {
			/*
			 * > A character token, if the current node is table,
			 * > tbody, template, tfoot, thead, or tr element
			 */
			case '#text':
				$current_node      = $this->state->stack_of_open_elements->current_node();
				$current_node_name = $current_node ? $current_node->node_name : null;
				if (
					$current_node_name && (
						'TABLE' === $current_node_name ||
						'TBODY' === $current_node_name ||
						'TEMPLATE' === $current_node_name ||
						'TFOOT' === $current_node_name ||
						'THEAD' === $current_node_name ||
						'TR' === $current_node_name
					)
				) {
					/*
					 * If the text is empty after processing HTML entities and stripping
					 * U+0000 NULL bytes then ignore the token.
					 */
					if ( parent::TEXT_IS_NULL_SEQUENCE === $this->text_node_classification ) {
						return $this->step();
					}

					/*
					 * This follows the rules for "in table text" insertion mode.
					 *
					 * Whitespace-only text nodes are inserted in-place. Otherwise
					 * foster parenting is enabled and the nodes would be
					 * inserted out-of-place.
					 *
					 * > If any of the tokens in the pending table character tokens
					 * > list are character tokens that are not ASCII whitespace,
					 * > then this is a parse error: reprocess the character tokens
					 * > in the pending table character tokens list using the rules
					 * > given in the "anything else" entry in the "in table"
					 * > insertion mode.
					 * >
					 * > Otherwise, insert the characters given by the pending table
					 * > character tokens list.
					 *
					 * @see https://html.spec.whatwg.org/#parsing-main-intabletext
					 */
					if ( parent::TEXT_IS_WHITESPACE === $this->text_node_classification ) {
						$this->insert_html_element( $this->state->current_token );
						return true;
					}

					// Non-whitespace would trigger fostering, unsupported at this time.
					$this->bail( 'Foster parenting is not supported.' );
					break;
				}
				break;

			/*
			 * > A comment token
			 */
			case '#comment':
			case '#funky-comment':
			case '#presumptuous-tag':
				$this->insert_html_element( $this->state->current_token );
				return true;

			/*
			 * > A DOCTYPE token
			 */
			case 'html':
				// Parse error: ignore the token.
				return $this->step();

			/*
			 * > A start tag whose tag name is "caption"
			 */
			case '+CAPTION':
				$this->state->stack_of_open_elements->clear_to_table_context();
				$this->state->active_formatting_elements->insert_marker();
				$this->insert_html_element( $this->state->current_token );
				$this->state->insertion_mode = WP_HTML_Processor_State::INSERTION_MODE_IN_CAPTION;
				return true;

			/*
			 * > A start tag whose tag name is "colgroup"
			 */
			case '+COLGROUP':
				$this->state->stack_of_open_elements->clear_to_table_context();
				$this->insert_html_element( $this->state->current_token );
				$this->state->insertion_mode = WP_HTML_Processor_State::INSERTION_MODE_IN_COLUMN_GROUP;
				return true;

			/*
			 * > A start tag whose tag name is "col"
			 */
			case '+COL':
				$this->state->stack_of_open_elements->clear_to_table_context();

				/*
				 * > Insert an HTML element for a "colgroup" start tag token with no attributes,
				 * > then switch the insertion mode to "in column group".
				 */
				$this->insert_virtual_node( 'COLGROUP' );
				$this->state->insertion_mode = WP_HTML_Processor_State::INSERTION_MODE_IN_COLUMN_GROUP;
				return $this->step( self::REPROCESS_CURRENT_NODE );

			/*
			 * > A start tag whose tag name is one of: "tbody", "tfoot", "thead"
			 */
			case '+TBODY':
			case '+TFOOT':
			case '+THEAD':
				$this->state->stack_of_open_elements->clear_to_table_context();
				$this->insert_html_element( $this->state->current_token );
				$this->state->insertion_mode = WP_HTML_Processor_State::INSERTION_MODE_IN_TABLE_BODY;
				return true;

			/*
			 * > A start tag whose tag name is one of: "td", "th", "tr"
			 */
			case '+TD':
			case '+TH':
			case '+TR':
				$this->state->stack_of_open_elements->clear_to_table_context();
				/*
				 * > Insert an HTML element for a "tbody" start tag token with no attributes,
				 * > then switch the insertion mode to "in table body".
				 */
				$this->insert_virtual_node( 'TBODY' );
				$this->state->insertion_mode = WP_HTML_Processor_State::INSERTION_MODE_IN_TABLE_BODY;
				return $this->step( self::REPROCESS_CURRENT_NODE );

			/*
			 * > A start tag whose tag name is "table"
			 *
			 * This tag in the IN TABLE insertion mode is a parse error.
			 */
			case '+TABLE':
				if ( ! $this->state->stack_of_open_elements->has_element_in_table_scope( 'TABLE' ) ) {
					return $this->step();
				}

				$this->state->stack_of_open_elements->pop_until( 'TABLE' );
				$this->reset_insertion_mode_appropriately();
				return $this->step( self::REPROCESS_CURRENT_NODE );

			/*
			 * > An end tag whose tag name is "table"
			 */
			case '-TABLE':
				if ( ! $this->state->stack_of_open_elements->has_element_in_table_scope( 'TABLE' ) ) {
					// @todo Indicate a parse error once it's possible.
					return $this->step();
				}

				$this->state->stack_of_open_elements->pop_until( 'TABLE' );
				$this->reset_insertion_mode_appropriately();
				return true;

			/*
			 * > An end tag whose tag name is one of: "body", "caption", "col", "colgroup", "html", "tbody", "td", "tfoot", "th", "thead", "tr"
			 */
			case '-BODY':
			case '-CAPTION':
			case '-COL':
			case '-COLGROUP':
			case '-HTML':
			case '-TBODY':
			case '-TD':
			case '-TFOOT':
			case '-TH':
			case '-THEAD':
			case '-TR':
				// Parse error: ignore the token.
				return $this->step();

			/*
			 * > A start tag whose tag name is one of: "style", "script", "template"
			 * > An end tag whose tag name is "template"
			 */
			case '+STYLE':
			case '+SCRIPT':
			case '+TEMPLATE':
			case '-TEMPLATE':
				/*
				 * > Process the token using the rules for the "in head" insertion mode.
				 */
				return $this->step_in_head();

			/*
			 * > A start tag whose tag name is "input"
			 *
			 * > If the token does not have an attribute with the name "type", or if it does, but
			 * > that attribute's value is not an ASCII case-insensitive match for the string
			 * > "hidden", then: act as described in the "anything else" entry below.
			 */
			case '+INPUT':
				$type_attribute = $this->get_attribute( 'type' );
				if ( ! is_string( $type_attribute ) || 'hidden' !== strtolower( $type_attribute ) ) {
					goto anything_else;
				}
				// @todo Indicate a parse error once it's possible.
				$this->insert_html_element( $this->state->current_token );
				return true;

			/*
			 * > A start tag whose tag name is "form"
			 *
			 * This tag in the IN TABLE insertion mode is a parse error.
			 */
			case '+FORM':
				if (
					$this->state->stack_of_open_elements->has_element_in_scope( 'TEMPLATE' ) ||
					isset( $this->state->form_element )
				) {
					return $this->step();
				}

				// This FORM is special because it immediately closes and cannot have other children.
				$this->insert_html_element( $this->state->current_token );
				$this->state->form_element = $this->state->current_token;
				$this->state->stack_of_open_elements->pop();
				return true;
		}

		/*
		 * > Anything else
		 * > Parse error. Enable foster parenting, process the token using the rules for the
		 * > "in body" insertion mode, and then disable foster parenting.
		 *
		 * @todo Indicate a parse error once it's possible.
		 */
		anything_else:
		$this->bail( 'Foster parenting is not supported.' );
	}

	/**
	 * Parses next element in the 'in table text' insertion mode.
	 *
	 * This internal function performs the 'in table text' insertion mode
	 * logic for the generalized WP_HTML_Processor::step() function.
	 *
	 * @since 6.7.0 Stub implementation.
	 *
	 * @throws WP_HTML_Unsupported_Exception When encountering unsupported HTML input.
	 *
	 * @see https://html.spec.whatwg.org/#parsing-main-intabletext
	 * @see WP_HTML_Processor::step
	 *
	 * @return bool Whether an element was found.
	 */
	private function step_in_table_text(): bool {
		$this->bail( 'No support for parsing in the ' . WP_HTML_Processor_State::INSERTION_MODE_IN_TABLE_TEXT . ' state.' );
	}

	/**
	 * Parses next element in the 'in caption' insertion mode.
	 *
	 * This internal function performs the 'in caption' insertion mode
	 * logic for the generalized WP_HTML_Processor::step() function.
	 *
	 * @since 6.7.0
	 *
	 * @throws WP_HTML_Unsupported_Exception When encountering unsupported HTML input.
	 *
	 * @see https://html.spec.whatwg.org/#parsing-main-incaption
	 * @see WP_HTML_Processor::step
	 *
	 * @return bool Whether an element was found.
	 */
	private function step_in_caption(): bool {
		$tag_name = $this->get_tag();
		$op_sigil = $this->is_tag_closer() ? '-' : '+';
		$op       = "{$op_sigil}{$tag_name}";

		switch ( $op ) {
			/*
			 * > An end tag whose tag name is "caption"
			 * > A start tag whose tag name is one of: "caption", "col", "colgroup", "tbody", "td", "tfoot", "th", "thead", "tr"
			 * > An end tag whose tag name is "table"
			 *
			 * These tag handling rules are identical except for the final instruction.
			 * Handle them in a single block.
			 */
			case '-CAPTION':
			case '+CAPTION':
			case '+COL':
			case '+COLGROUP':
			case '+TBODY':
			case '+TD':
			case '+TFOOT':
			case '+TH':
			case '+THEAD':
			case '+TR':
			case '-TABLE':
				if ( ! $this->state->stack_of_open_elements->has_element_in_table_scope( 'CAPTION' ) ) {
					// Parse error: ignore the token.
					return $this->step();
				}

				$this->generate_implied_end_tags();
				if ( ! $this->state->stack_of_open_elements->current_node_is( 'CAPTION' ) ) {
					// @todo Indicate a parse error once it's possible.
				}

				$this->state->stack_of_open_elements->pop_until( 'CAPTION' );
				$this->state->active_formatting_elements->clear_up_to_last_marker();
				$this->state->insertion_mode = WP_HTML_Processor_State::INSERTION_MODE_IN_TABLE;

				// If this is not a CAPTION end tag, the token should be reprocessed.
				if ( '-CAPTION' === $op ) {
					return true;
				}
				return $this->step( self::REPROCESS_CURRENT_NODE );

			/**
			 * > An end tag whose tag name is one of: "body", "col", "colgroup", "html", "tbody", "td", "tfoot", "th", "thead", "tr"
			 */
			case '-BODY':
			case '-COL':
			case '-COLGROUP':
			case '-HTML':
			case '-TBODY':
			case '-TD':
			case '-TFOOT':
			case '-TH':
			case '-THEAD':
			case '-TR':
				// Parse error: ignore the token.
				return $this->step();
		}

		/**
		 * > Anything else
		 * >   Process the token using the rules for the "in body" insertion mode.
		 */
		return $this->step_in_body();
	}

	/**
	 * Parses next element in the 'in column group' insertion mode.
	 *
	 * This internal function performs the 'in column group' insertion mode
	 * logic for the generalized WP_HTML_Processor::step() function.
	 *
	 * @since 6.7.0
	 *
	 * @throws WP_HTML_Unsupported_Exception When encountering unsupported HTML input.
	 *
	 * @see https://html.spec.whatwg.org/#parsing-main-incolgroup
	 * @see WP_HTML_Processor::step
	 *
	 * @return bool Whether an element was found.
	 */
	private function step_in_column_group(): bool {
		$token_name = $this->get_token_name();
		$token_type = $this->get_token_type();
		$op_sigil   = '#tag' === $token_type ? ( parent::is_tag_closer() ? '-' : '+' ) : '';
		$op         = "{$op_sigil}{$token_name}";

		switch ( $op ) {
			/*
			 * > A character token that is one of U+0009 CHARACTER TABULATION, U+000A LINE FEED (LF),
			 * > U+000C FORM FEED (FF), U+000D CARRIAGE RETURN (CR), or U+0020 SPACE
			 */
			case '#text':
				if ( parent::TEXT_IS_WHITESPACE === $this->text_node_classification ) {
					// Insert the character.
					$this->insert_html_element( $this->state->current_token );
					return true;
				}

				goto in_column_group_anything_else;
				break;

			/*
			 * > A comment token
			 */
			case '#comment':
			case '#funky-comment':
			case '#presumptuous-tag':
				$this->insert_html_element( $this->state->current_token );
				return true;

			/*
			 * > A DOCTYPE token
			 */
			case 'html':
				// @todo Indicate a parse error once it's possible.
				return $this->step();

			/*
			 * > A start tag whose tag name is "html"
			 */
			case '+HTML':
				return $this->step_in_body();

			/*
			 * > A start tag whose tag name is "col"
			 */
			case '+COL':
				$this->insert_html_element( $this->state->current_token );
				$this->state->stack_of_open_elements->pop();
				return true;

			/*
			 * > An end tag whose tag name is "colgroup"
			 */
			case '-COLGROUP':
				if ( ! $this->state->stack_of_open_elements->current_node_is( 'COLGROUP' ) ) {
					// @todo Indicate a parse error once it's possible.
					return $this->step();
				}
				$this->state->stack_of_open_elements->pop();
				$this->state->insertion_mode = WP_HTML_Processor_State::INSERTION_MODE_IN_TABLE;
				return true;

			/*
			 * > An end tag whose tag name is "col"
			 */
			case '-COL':
				// Parse error: ignore the token.
				return $this->step();

			/*
			 * > A start tag whose tag name is "template"
			 * > An end tag whose tag name is "template"
			 */
			case '+TEMPLATE':
			case '-TEMPLATE':
				return $this->step_in_head();
		}

		in_column_group_anything_else:
		/*
		 * > Anything else
		 */
		if ( ! $this->state->stack_of_open_elements->current_node_is( 'COLGROUP' ) ) {
			// @todo Indicate a parse error once it's possible.
			return $this->step();
		}
		$this->state->stack_of_open_elements->pop();
		$this->state->insertion_mode = WP_HTML_Processor_State::INSERTION_MODE_IN_TABLE;
		return $this->step( self::REPROCESS_CURRENT_NODE );
	}

	/**
	 * Parses next element in the 'in table body' insertion mode.
	 *
	 * This internal function performs the 'in table body' insertion mode
	 * logic for the generalized WP_HTML_Processor::step() function.
	 *
	 * @since 6.7.0
	 *
	 * @throws WP_HTML_Unsupported_Exception When encountering unsupported HTML input.
	 *
	 * @see https://html.spec.whatwg.org/#parsing-main-intbody
	 * @see WP_HTML_Processor::step
	 *
	 * @return bool Whether an element was found.
	 */
	private function step_in_table_body(): bool {
		$tag_name = $this->get_tag();
		$op_sigil = $this->is_tag_closer() ? '-' : '+';
		$op       = "{$op_sigil}{$tag_name}";

		switch ( $op ) {
			/*
			 * > A start tag whose tag name is "tr"
			 */
			case '+TR':
				$this->state->stack_of_open_elements->clear_to_table_body_context();
				$this->insert_html_element( $this->state->current_token );
				$this->state->insertion_mode = WP_HTML_Processor_State::INSERTION_MODE_IN_ROW;
				return true;

			/*
			 * > A start tag whose tag name is one of: "th", "td"
			 */
			case '+TH':
			case '+TD':
				// @todo Indicate a parse error once it's possible.
				$this->state->stack_of_open_elements->clear_to_table_body_context();
				$this->insert_virtual_node( 'TR' );
				$this->state->insertion_mode = WP_HTML_Processor_State::INSERTION_MODE_IN_ROW;
				return $this->step( self::REPROCESS_CURRENT_NODE );

			/*
			 * > An end tag whose tag name is one of: "tbody", "tfoot", "thead"
			 */
			case '-TBODY':
			case '-TFOOT':
			case '-THEAD':
				if ( ! $this->state->stack_of_open_elements->has_element_in_table_scope( $tag_name ) ) {
					// Parse error: ignore the token.
					return $this->step();
				}

				$this->state->stack_of_open_elements->clear_to_table_body_context();
				$this->state->stack_of_open_elements->pop();
				$this->state->insertion_mode = WP_HTML_Processor_State::INSERTION_MODE_IN_TABLE;
				return true;

			/*
			 * > A start tag whose tag name is one of: "caption", "col", "colgroup", "tbody", "tfoot", "thead"
			 * > An end tag whose tag name is "table"
			 */
			case '+CAPTION':
			case '+COL':
			case '+COLGROUP':
			case '+TBODY':
			case '+TFOOT':
			case '+THEAD':
			case '-TABLE':
				if (
					! $this->state->stack_of_open_elements->has_element_in_table_scope( 'TBODY' ) &&
					! $this->state->stack_of_open_elements->has_element_in_table_scope( 'THEAD' ) &&
					! $this->state->stack_of_open_elements->has_element_in_table_scope( 'TFOOT' )
				) {
					// Parse error: ignore the token.
					return $this->step();
				}
				$this->state->stack_of_open_elements->clear_to_table_body_context();
				$this->state->stack_of_open_elements->pop();
				$this->state->insertion_mode = WP_HTML_Processor_State::INSERTION_MODE_IN_TABLE;
				return $this->step( self::REPROCESS_CURRENT_NODE );

			/*
			 * > An end tag whose tag name is one of: "body", "caption", "col", "colgroup", "html", "td", "th", "tr"
			 */
			case '-BODY':
			case '-CAPTION':
			case '-COL':
			case '-COLGROUP':
			case '-HTML':
			case '-TD':
			case '-TH':
			case '-TR':
				// Parse error: ignore the token.
				return $this->step();
		}

		/*
		 * > Anything else
		 * > Process the token using the rules for the "in table" insertion mode.
		 */
		return $this->step_in_table();
	}

	/**
	 * Parses next element in the 'in row' insertion mode.
	 *
	 * This internal function performs the 'in row' insertion mode
	 * logic for the generalized WP_HTML_Processor::step() function.
	 *
	 * @since 6.7.0
	 *
	 * @throws WP_HTML_Unsupported_Exception When encountering unsupported HTML input.
	 *
	 * @see https://html.spec.whatwg.org/#parsing-main-intr
	 * @see WP_HTML_Processor::step
	 *
	 * @return bool Whether an element was found.
	 */
	private function step_in_row(): bool {
		$tag_name = $this->get_tag();
		$op_sigil = $this->is_tag_closer() ? '-' : '+';
		$op       = "{$op_sigil}{$tag_name}";

		switch ( $op ) {
			/*
			 * > A start tag whose tag name is one of: "th", "td"
			 */
			case '+TH':
			case '+TD':
				$this->state->stack_of_open_elements->clear_to_table_row_context();
				$this->insert_html_element( $this->state->current_token );
				$this->state->insertion_mode = WP_HTML_Processor_State::INSERTION_MODE_IN_CELL;
				$this->state->active_formatting_elements->insert_marker();
				return true;

			/*
			 * > An end tag whose tag name is "tr"
			 */
			case '-TR':
				if ( ! $this->state->stack_of_open_elements->has_element_in_table_scope( 'TR' ) ) {
					// Parse error: ignore the token.
					return $this->step();
				}

				$this->state->stack_of_open_elements->clear_to_table_row_context();
				$this->state->stack_of_open_elements->pop();
				$this->state->insertion_mode = WP_HTML_Processor_State::INSERTION_MODE_IN_TABLE_BODY;
				return true;

			/*
			 * > A start tag whose tag name is one of: "caption", "col", "colgroup", "tbody", "tfoot", "thead", "tr"
			 * > An end tag whose tag name is "table"
			 */
			case '+CAPTION':
			case '+COL':
			case '+COLGROUP':
			case '+TBODY':
			case '+TFOOT':
			case '+THEAD':
			case '+TR':
			case '-TABLE':
				if ( ! $this->state->stack_of_open_elements->has_element_in_table_scope( 'TR' ) ) {
					// Parse error: ignore the token.
					return $this->step();
				}

				$this->state->stack_of_open_elements->clear_to_table_row_context();
				$this->state->stack_of_open_elements->pop();
				$this->state->insertion_mode = WP_HTML_Processor_State::INSERTION_MODE_IN_TABLE_BODY;
				return $this->step( self::REPROCESS_CURRENT_NODE );

			/*
			 * > An end tag whose tag name is one of: "tbody", "tfoot", "thead"
			 */
			case '-TBODY':
			case '-TFOOT':
			case '-THEAD':
				if ( ! $this->state->stack_of_open_elements->has_element_in_table_scope( $tag_name ) ) {
					// Parse error: ignore the token.
					return $this->step();
				}

				if ( ! $this->state->stack_of_open_elements->has_element_in_table_scope( 'TR' ) ) {
					// Ignore the token.
					return $this->step();
				}

				$this->state->stack_of_open_elements->clear_to_table_row_context();
				$this->state->stack_of_open_elements->pop();
				$this->state->insertion_mode = WP_HTML_Processor_State::INSERTION_MODE_IN_TABLE_BODY;
				return $this->step( self::REPROCESS_CURRENT_NODE );

			/*
			 * > An end tag whose tag name is one of: "body", "caption", "col", "colgroup", "html", "td", "th"
			 */
			case '-BODY':
			case '-CAPTION':
			case '-COL':
			case '-COLGROUP':
			case '-HTML':
			case '-TD':
			case '-TH':
				// Parse error: ignore the token.
				return $this->step();
		}

		/*
		 * > Anything else
		 * >   Process the token using the rules for the "in table" insertion mode.
		 */
		return $this->step_in_table();
	}

	/**
	 * Parses next element in the 'in cell' insertion mode.
	 *
	 * This internal function performs the 'in cell' insertion mode
	 * logic for the generalized WP_HTML_Processor::step() function.
	 *
	 * @since 6.7.0
	 *
	 * @throws WP_HTML_Unsupported_Exception When encountering unsupported HTML input.
	 *
	 * @see https://html.spec.whatwg.org/#parsing-main-intd
	 * @see WP_HTML_Processor::step
	 *
	 * @return bool Whether an element was found.
	 */
	private function step_in_cell(): bool {
		$tag_name = $this->get_tag();
		$op_sigil = $this->is_tag_closer() ? '-' : '+';
		$op       = "{$op_sigil}{$tag_name}";

		switch ( $op ) {
			/*
			 * > An end tag whose tag name is one of: "td", "th"
			 */
			case '-TD':
			case '-TH':
				if ( ! $this->state->stack_of_open_elements->has_element_in_table_scope( $tag_name ) ) {
					// Parse error: ignore the token.
					return $this->step();
				}

				$this->generate_implied_end_tags();

				/*
				 * @todo This needs to check if the current node is an HTML element, meaning that
				 *       when SVG and MathML support is added, this needs to differentiate between an
				 *       HTML element of the given name, such as `<center>`, and a foreign element of
				 *       the same given name.
				 */
				if ( ! $this->state->stack_of_open_elements->current_node_is( $tag_name ) ) {
					// @todo Indicate a parse error once it's possible.
				}

				$this->state->stack_of_open_elements->pop_until( $tag_name );
				$this->state->active_formatting_elements->clear_up_to_last_marker();
				$this->state->insertion_mode = WP_HTML_Processor_State::INSERTION_MODE_IN_ROW;
				return true;

			/*
			 * > A start tag whose tag name is one of: "caption", "col", "colgroup", "tbody", "td",
			 * > "tfoot", "th", "thead", "tr"
			 */
			case '+CAPTION':
			case '+COL':
			case '+COLGROUP':
			case '+TBODY':
			case '+TD':
			case '+TFOOT':
			case '+TH':
			case '+THEAD':
			case '+TR':
				/*
				 * > Assert: The stack of open elements has a td or th element in table scope.
				 *
				 * Nothing to do here, except to verify in tests that this never appears.
				 */

				$this->close_cell();
				return $this->step( self::REPROCESS_CURRENT_NODE );

			/*
			 * > An end tag whose tag name is one of: "body", "caption", "col", "colgroup", "html"
			 */
			case '-BODY':
			case '-CAPTION':
			case '-COL':
			case '-COLGROUP':
			case '-HTML':
				// Parse error: ignore the token.
				return $this->step();

			/*
			 * > An end tag whose tag name is one of: "table", "tbody", "tfoot", "thead", "tr"
			 */
			case '-TABLE':
			case '-TBODY':
			case '-TFOOT':
			case '-THEAD':
			case '-TR':
				if ( ! $this->state->stack_of_open_elements->has_element_in_table_scope( $tag_name ) ) {
					// Parse error: ignore the token.
					return $this->step();
				}
				$this->close_cell();
				return $this->step( self::REPROCESS_CURRENT_NODE );
		}

		/*
		 * > Anything else
		 * >   Process the token using the rules for the "in body" insertion mode.
		 */
		return $this->step_in_body();
	}

	/**
	 * Parses next element in the 'in select' insertion mode.
	 *
	 * This internal function performs the 'in select' insertion mode
	 * logic for the generalized WP_HTML_Processor::step() function.
	 *
	 * @since 6.7.0
	 *
	 * @throws WP_HTML_Unsupported_Exception When encountering unsupported HTML input.
	 *
	 * @see https://html.spec.whatwg.org/multipage/parsing.html#parsing-main-inselect
	 * @see WP_HTML_Processor::step
	 *
	 * @return bool Whether an element was found.
	 */
	private function step_in_select(): bool {
		$token_name = $this->get_token_name();
		$token_type = $this->get_token_type();
		$op_sigil   = '#tag' === $token_type ? ( parent::is_tag_closer() ? '-' : '+' ) : '';
		$op         = "{$op_sigil}{$token_name}";

		switch ( $op ) {
			/*
			 * > Any other character token
			 */
			case '#text':
				/*
				 * > A character token that is U+0000 NULL
				 *
				 * If a text node only comprises null bytes then it should be
				 * entirely ignored and should not return to calling code.
				 */
				if ( parent::TEXT_IS_NULL_SEQUENCE === $this->text_node_classification ) {
					// Parse error: ignore the token.
					return $this->step();
				}

				$this->insert_html_element( $this->state->current_token );
				return true;

			/*
			 * > A comment token
			 */
			case '#comment':
			case '#funky-comment':
			case '#presumptuous-tag':
				$this->insert_html_element( $this->state->current_token );
				return true;

			/*
			 * > A DOCTYPE token
			 */
			case 'html':
				// Parse error: ignore the token.
				return $this->step();

			/*
			 * > A start tag whose tag name is "html"
			 */
			case '+HTML':
				return $this->step_in_body();

			/*
			 * > A start tag whose tag name is "option"
			 */
			case '+OPTION':
				if ( $this->state->stack_of_open_elements->current_node_is( 'OPTION' ) ) {
					$this->state->stack_of_open_elements->pop();
				}
				$this->insert_html_element( $this->state->current_token );
				return true;

			/*
			 * > A start tag whose tag name is "optgroup"
			 * > A start tag whose tag name is "hr"
			 *
			 * These rules are identical except for the treatment of the self-closing flag and
			 * the subsequent pop of the HR void element, all of which is handled elsewhere in the processor.
			 */
			case '+OPTGROUP':
			case '+HR':
				if ( $this->state->stack_of_open_elements->current_node_is( 'OPTION' ) ) {
					$this->state->stack_of_open_elements->pop();
				}

				if ( $this->state->stack_of_open_elements->current_node_is( 'OPTGROUP' ) ) {
					$this->state->stack_of_open_elements->pop();
				}

				$this->insert_html_element( $this->state->current_token );
				return true;

			/*
			 * > An end tag whose tag name is "optgroup"
			 */
			case '-OPTGROUP':
				$current_node = $this->state->stack_of_open_elements->current_node();
				if ( $current_node && 'OPTION' === $current_node->node_name ) {
					foreach ( $this->state->stack_of_open_elements->walk_up( $current_node ) as $parent ) {
						break;
					}
					if ( $parent && 'OPTGROUP' === $parent->node_name ) {
						$this->state->stack_of_open_elements->pop();
					}
				}

				if ( $this->state->stack_of_open_elements->current_node_is( 'OPTGROUP' ) ) {
					$this->state->stack_of_open_elements->pop();
					return true;
				}

				// Parse error: ignore the token.
				return $this->step();

			/*
			 * > An end tag whose tag name is "option"
			 */
			case '-OPTION':
				if ( $this->state->stack_of_open_elements->current_node_is( 'OPTION' ) ) {
					$this->state->stack_of_open_elements->pop();
					return true;
				}

				// Parse error: ignore the token.
				return $this->step();

			/*
			 * > An end tag whose tag name is "select"
			 * > A start tag whose tag name is "select"
			 *
			 * > It just gets treated like an end tag.
			 */
			case '-SELECT':
			case '+SELECT':
				if ( ! $this->state->stack_of_open_elements->has_element_in_select_scope( 'SELECT' ) ) {
					// Parse error: ignore the token.
					return $this->step();
				}
				$this->state->stack_of_open_elements->pop_until( 'SELECT' );
				$this->reset_insertion_mode_appropriately();
				return true;

			/*
			 * > A start tag whose tag name is one of: "input", "keygen", "textarea"
			 *
			 * All three of these tags are considered a parse error when found in this insertion mode.
			 */
			case '+INPUT':
			case '+KEYGEN':
			case '+TEXTAREA':
				if ( ! $this->state->stack_of_open_elements->has_element_in_select_scope( 'SELECT' ) ) {
					// Ignore the token.
					return $this->step();
				}
				$this->state->stack_of_open_elements->pop_until( 'SELECT' );
				$this->reset_insertion_mode_appropriately();
				return $this->step( self::REPROCESS_CURRENT_NODE );

			/*
			 * > A start tag whose tag name is one of: "script", "template"
			 * > An end tag whose tag name is "template"
			 */
			case '+SCRIPT':
			case '+TEMPLATE':
			case '-TEMPLATE':
				return $this->step_in_head();
		}

		/*
		 * > Anything else
		 * >   Parse error: ignore the token.
		 */
		return $this->step();
	}

	/**
	 * Parses next element in the 'in select in table' insertion mode.
	 *
	 * This internal function performs the 'in select in table' insertion mode
	 * logic for the generalized WP_HTML_Processor::step() function.
	 *
	 * @since 6.7.0
	 *
	 * @throws WP_HTML_Unsupported_Exception When encountering unsupported HTML input.
	 *
	 * @see https://html.spec.whatwg.org/#parsing-main-inselectintable
	 * @see WP_HTML_Processor::step
	 *
	 * @return bool Whether an element was found.
	 */
	private function step_in_select_in_table(): bool {
		$token_name = $this->get_token_name();
		$token_type = $this->get_token_type();
		$op_sigil   = '#tag' === $token_type ? ( parent::is_tag_closer() ? '-' : '+' ) : '';
		$op         = "{$op_sigil}{$token_name}";

		switch ( $op ) {
			/*
			 * > A start tag whose tag name is one of: "caption", "table", "tbody", "tfoot", "thead", "tr", "td", "th"
			 */
			case '+CAPTION':
			case '+TABLE':
			case '+TBODY':
			case '+TFOOT':
			case '+THEAD':
			case '+TR':
			case '+TD':
			case '+TH':
				// @todo Indicate a parse error once it's possible.
				$this->state->stack_of_open_elements->pop_until( 'SELECT' );
				$this->reset_insertion_mode_appropriately();
				return $this->step( self::REPROCESS_CURRENT_NODE );

			/*
			 * > An end tag whose tag name is one of: "caption", "table", "tbody", "tfoot", "thead", "tr", "td", "th"
			 */
			case '-CAPTION':
			case '-TABLE':
			case '-TBODY':
			case '-TFOOT':
			case '-THEAD':
			case '-TR':
			case '-TD':
			case '-TH':
				// @todo Indicate a parse error once it's possible.
				if ( ! $this->state->stack_of_open_elements->has_element_in_table_scope( $token_name ) ) {
					return $this->step();
				}
				$this->state->stack_of_open_elements->pop_until( 'SELECT' );
				$this->reset_insertion_mode_appropriately();
				return $this->step( self::REPROCESS_CURRENT_NODE );
		}

		/*
		 * > Anything else
		 */
		return $this->step_in_select();
	}

	/**
	 * Parses next element in the 'in template' insertion mode.
	 *
	 * This internal function performs the 'in template' insertion mode
	 * logic for the generalized WP_HTML_Processor::step() function.
	 *
	 * @since 6.7.0 Stub implementation.
	 *
	 * @throws WP_HTML_Unsupported_Exception When encountering unsupported HTML input.
	 *
	 * @see https://html.spec.whatwg.org/#parsing-main-intemplate
	 * @see WP_HTML_Processor::step
	 *
	 * @return bool Whether an element was found.
	 */
	private function step_in_template(): bool {
		$token_name = $this->get_token_name();
		$token_type = $this->get_token_type();
		$is_closer  = $this->is_tag_closer();
		$op_sigil   = '#tag' === $token_type ? ( $is_closer ? '-' : '+' ) : '';
		$op         = "{$op_sigil}{$token_name}";

		switch ( $op ) {
			/*
			 * > A character token
			 * > A comment token
			 * > A DOCTYPE token
			 */
			case '#text':
			case '#comment':
			case '#funky-comment':
			case '#presumptuous-tag':
			case 'html':
				return $this->step_in_body();

			/*
			 * > A start tag whose tag name is one of: "base", "basefont", "bgsound", "link",
			 * > "meta", "noframes", "script", "style", "template", "title"
			 * > An end tag whose tag name is "template"
			 */
			case '+BASE':
			case '+BASEFONT':
			case '+BGSOUND':
			case '+LINK':
			case '+META':
			case '+NOFRAMES':
			case '+SCRIPT':
			case '+STYLE':
			case '+TEMPLATE':
			case '+TITLE':
			case '-TEMPLATE':
				return $this->step_in_head();

			/*
			 * > A start tag whose tag name is one of: "caption", "colgroup", "tbody", "tfoot", "thead"
			 */
			case '+CAPTION':
			case '+COLGROUP':
			case '+TBODY':
			case '+TFOOT':
			case '+THEAD':
				array_pop( $this->state->stack_of_template_insertion_modes );
				$this->state->stack_of_template_insertion_modes[] = WP_HTML_Processor_State::INSERTION_MODE_IN_TABLE;
				$this->state->insertion_mode                      = WP_HTML_Processor_State::INSERTION_MODE_IN_TABLE;
				return $this->step( self::REPROCESS_CURRENT_NODE );

			/*
			 * > A start tag whose tag name is "col"
			 */
			case '+COL':
				array_pop( $this->state->stack_of_template_insertion_modes );
				$this->state->stack_of_template_insertion_modes[] = WP_HTML_Processor_State::INSERTION_MODE_IN_COLUMN_GROUP;
				$this->state->insertion_mode                      = WP_HTML_Processor_State::INSERTION_MODE_IN_COLUMN_GROUP;
				return $this->step( self::REPROCESS_CURRENT_NODE );

			/*
			 * > A start tag whose tag name is "tr"
			 */
			case '+TR':
				array_pop( $this->state->stack_of_template_insertion_modes );
				$this->state->stack_of_template_insertion_modes[] = WP_HTML_Processor_State::INSERTION_MODE_IN_TABLE_BODY;
				$this->state->insertion_mode                      = WP_HTML_Processor_State::INSERTION_MODE_IN_TABLE_BODY;
				return $this->step( self::REPROCESS_CURRENT_NODE );

			/*
			 * > A start tag whose tag name is one of: "td", "th"
			 */
			case '+TD':
			case '+TH':
				array_pop( $this->state->stack_of_template_insertion_modes );
				$this->state->stack_of_template_insertion_modes[] = WP_HTML_Processor_State::INSERTION_MODE_IN_ROW;
				$this->state->insertion_mode                      = WP_HTML_Processor_State::INSERTION_MODE_IN_ROW;
				return $this->step( self::REPROCESS_CURRENT_NODE );
		}

		/*
		 * > Any other start tag
		 */
		if ( ! $is_closer ) {
			array_pop( $this->state->stack_of_template_insertion_modes );
			$this->state->stack_of_template_insertion_modes[] = WP_HTML_Processor_State::INSERTION_MODE_IN_BODY;
			$this->state->insertion_mode                      = WP_HTML_Processor_State::INSERTION_MODE_IN_BODY;
			return $this->step( self::REPROCESS_CURRENT_NODE );
		}

		/*
		 * > Any other end tag
		 */
		if ( $is_closer ) {
			// Parse error: ignore the token.
			return $this->step();
		}

		/*
		 * > An end-of-file token
		 */
		if ( ! $this->state->stack_of_open_elements->contains( 'TEMPLATE' ) ) {
			// Stop parsing.
			return false;
		}

		// @todo Indicate a parse error once it's possible.
		$this->state->stack_of_open_elements->pop_until( 'TEMPLATE' );
		$this->state->active_formatting_elements->clear_up_to_last_marker();
		array_pop( $this->state->stack_of_template_insertion_modes );
		$this->reset_insertion_mode_appropriately();
		return $this->step( self::REPROCESS_CURRENT_NODE );
	}

	/**
	 * Parses next element in the 'after body' insertion mode.
	 *
	 * This internal function performs the 'after body' insertion mode
	 * logic for the generalized WP_HTML_Processor::step() function.
	 *
	 * @since 6.7.0 Stub implementation.
	 *
	 * @throws WP_HTML_Unsupported_Exception When encountering unsupported HTML input.
	 *
	 * @see https://html.spec.whatwg.org/#parsing-main-afterbody
	 * @see WP_HTML_Processor::step
	 *
	 * @return bool Whether an element was found.
	 */
	private function step_after_body(): bool {
		$tag_name   = $this->get_token_name();
		$token_type = $this->get_token_type();
		$op_sigil   = '#tag' === $token_type ? ( $this->is_tag_closer() ? '-' : '+' ) : '';
		$op         = "{$op_sigil}{$tag_name}";

		switch ( $op ) {
			/*
			 * > A character token that is one of U+0009 CHARACTER TABULATION, U+000A LINE FEED (LF),
			 * >   U+000C FORM FEED (FF), U+000D CARRIAGE RETURN (CR), or U+0020 SPACE
			 *
			 * > Process the token using the rules for the "in body" insertion mode.
			 */
			case '#text':
				if ( parent::TEXT_IS_WHITESPACE === $this->text_node_classification ) {
					return $this->step_in_body();
				}
				goto after_body_anything_else;
				break;

			/*
			 * > A comment token
			 */
			case '#comment':
			case '#funky-comment':
			case '#presumptuous-tag':
				$this->bail( 'Content outside of BODY is unsupported.' );
				break;

			/*
			 * > A DOCTYPE token
			 */
			case 'html':
				// Parse error: ignore the token.
				return $this->step();

			/*
			 * > A start tag whose tag name is "html"
			 */
			case '+HTML':
				return $this->step_in_body();

			/*
			 * > An end tag whose tag name is "html"
			 *
			 * > If the parser was created as part of the HTML fragment parsing algorithm,
			 * > this is a parse error; ignore the token. (fragment case)
			 * >
			 * > Otherwise, switch the insertion mode to "after after body".
			 */
			case '-HTML':
				if ( isset( $this->context_node ) ) {
					return $this->step();
				}

				$this->state->insertion_mode = WP_HTML_Processor_State::INSERTION_MODE_AFTER_AFTER_BODY;
				/*
				 * The HTML element is not removed from the stack of open elements.
				 * Only internal state has changed, this does not qualify as a "step"
				 * in terms of advancing through the document to another token.
				 * Nothing has been pushed or popped.
				 * Proceed to parse the next item.
				 */
				return $this->step();
		}

		/*
		 * > Parse error. Switch the insertion mode to "in body" and reprocess the token.
		 */
		after_body_anything_else:
		$this->state->insertion_mode = WP_HTML_Processor_State::INSERTION_MODE_IN_BODY;
		return $this->step( self::REPROCESS_CURRENT_NODE );
	}

	/**
	 * Parses next element in the 'in frameset' insertion mode.
	 *
	 * This internal function performs the 'in frameset' insertion mode
	 * logic for the generalized WP_HTML_Processor::step() function.
	 *
	 * @since 6.7.0 Stub implementation.
	 *
	 * @throws WP_HTML_Unsupported_Exception When encountering unsupported HTML input.
	 *
	 * @see https://html.spec.whatwg.org/#parsing-main-inframeset
	 * @see WP_HTML_Processor::step
	 *
	 * @return bool Whether an element was found.
	 */
	private function step_in_frameset(): bool {
		$tag_name   = $this->get_token_name();
		$token_type = $this->get_token_type();
		$op_sigil   = '#tag' === $token_type ? ( $this->is_tag_closer() ? '-' : '+' ) : '';
		$op         = "{$op_sigil}{$tag_name}";

		switch ( $op ) {
			/*
			 * > A character token that is one of U+0009 CHARACTER TABULATION, U+000A LINE FEED (LF),
			 * >   U+000C FORM FEED (FF), U+000D CARRIAGE RETURN (CR), or U+0020 SPACE
			 * >
			 * > Insert the character.
			 *
			 * This algorithm effectively strips non-whitespace characters from text and inserts
			 * them under HTML. This is not supported at this time.
			 */
			case '#text':
				if ( parent::TEXT_IS_WHITESPACE === $this->text_node_classification ) {
					return $this->step_in_body();
				}
				$this->bail( 'Non-whitespace characters cannot be handled in frameset.' );
				break;

			/*
			 * > A comment token
			 */
			case '#comment':
			case '#funky-comment':
			case '#presumptuous-tag':
				$this->insert_html_element( $this->state->current_token );
				return true;

			/*
			 * > A DOCTYPE token
			 */
			case 'html':
				// Parse error: ignore the token.
				return $this->step();

			/*
			 * > A start tag whose tag name is "html"
			 */
			case '+HTML':
				return $this->step_in_body();

			/*
			 * > A start tag whose tag name is "frameset"
			 */
			case '+FRAMESET':
				$this->insert_html_element( $this->state->current_token );
				return true;

			/*
			 * > An end tag whose tag name is "frameset"
			 */
			case '-FRAMESET':
				/*
				 * > If the current node is the root html element, then this is a parse error;
				 * > ignore the token. (fragment case)
				 */
				if ( $this->state->stack_of_open_elements->current_node_is( 'HTML' ) ) {
					return $this->step();
				}

				/*
				 * > Otherwise, pop the current node from the stack of open elements.
				 */
				$this->state->stack_of_open_elements->pop();

				/*
				 * > If the parser was not created as part of the HTML fragment parsing algorithm
				 * > (fragment case), and the current node is no longer a frameset element, then
				 * > switch the insertion mode to "after frameset".
				 */
				if ( ! isset( $this->context_node ) && ! $this->state->stack_of_open_elements->current_node_is( 'FRAMESET' ) ) {
					$this->state->insertion_mode = WP_HTML_Processor_State::INSERTION_MODE_AFTER_FRAMESET;
				}

				return true;

			/*
			 * > A start tag whose tag name is "frame"
			 *
			 * > Insert an HTML element for the token. Immediately pop the
			 * > current node off the stack of open elements.
			 * >
			 * > Acknowledge the token's self-closing flag, if it is set.
			 */
			case '+FRAME':
				$this->insert_html_element( $this->state->current_token );
				$this->state->stack_of_open_elements->pop();
				return true;

			/*
			 * > A start tag whose tag name is "noframes"
			 */
			case '+NOFRAMES':
				return $this->step_in_head();
		}

		// Parse error: ignore the token.
		return $this->step();
	}

	/**
	 * Parses next element in the 'after frameset' insertion mode.
	 *
	 * This internal function performs the 'after frameset' insertion mode
	 * logic for the generalized WP_HTML_Processor::step() function.
	 *
	 * @since 6.7.0 Stub implementation.
	 *
	 * @throws WP_HTML_Unsupported_Exception When encountering unsupported HTML input.
	 *
	 * @see https://html.spec.whatwg.org/#parsing-main-afterframeset
	 * @see WP_HTML_Processor::step
	 *
	 * @return bool Whether an element was found.
	 */
	private function step_after_frameset(): bool {
		$tag_name   = $this->get_token_name();
		$token_type = $this->get_token_type();
		$op_sigil   = '#tag' === $token_type ? ( $this->is_tag_closer() ? '-' : '+' ) : '';
		$op         = "{$op_sigil}{$tag_name}";

		switch ( $op ) {
			/*
			 * > A character token that is one of U+0009 CHARACTER TABULATION, U+000A LINE FEED (LF),
			 * >   U+000C FORM FEED (FF), U+000D CARRIAGE RETURN (CR), or U+0020 SPACE
			 * >
			 * > Insert the character.
			 *
			 * This algorithm effectively strips non-whitespace characters from text and inserts
			 * them under HTML. This is not supported at this time.
			 */
			case '#text':
				if ( parent::TEXT_IS_WHITESPACE === $this->text_node_classification ) {
					return $this->step_in_body();
				}
				$this->bail( 'Non-whitespace characters cannot be handled in after frameset' );
				break;

			/*
			 * > A comment token
			 */
			case '#comment':
			case '#funky-comment':
			case '#presumptuous-tag':
				$this->insert_html_element( $this->state->current_token );
				return true;

			/*
			 * > A DOCTYPE token
			 */
			case 'html':
				// Parse error: ignore the token.
				return $this->step();

			/*
			 * > A start tag whose tag name is "html"
			 */
			case '+HTML':
				return $this->step_in_body();

			/*
			 * > An end tag whose tag name is "html"
			 */
			case '-HTML':
				$this->state->insertion_mode = WP_HTML_Processor_State::INSERTION_MODE_AFTER_AFTER_FRAMESET;
				/*
				 * The HTML element is not removed from the stack of open elements.
				 * Only internal state has changed, this does not qualify as a "step"
				 * in terms of advancing through the document to another token.
				 * Nothing has been pushed or popped.
				 * Proceed to parse the next item.
				 */
				return $this->step();

			/*
			 * > A start tag whose tag name is "noframes"
			 */
			case '+NOFRAMES':
				return $this->step_in_head();
		}

		// Parse error: ignore the token.
		return $this->step();
	}

	/**
	 * Parses next element in the 'after after body' insertion mode.
	 *
	 * This internal function performs the 'after after body' insertion mode
	 * logic for the generalized WP_HTML_Processor::step() function.
	 *
	 * @since 6.7.0 Stub implementation.
	 *
	 * @throws WP_HTML_Unsupported_Exception When encountering unsupported HTML input.
	 *
	 * @see https://html.spec.whatwg.org/#the-after-after-body-insertion-mode
	 * @see WP_HTML_Processor::step
	 *
	 * @return bool Whether an element was found.
	 */
	private function step_after_after_body(): bool {
		$tag_name   = $this->get_token_name();
		$token_type = $this->get_token_type();
		$op_sigil   = '#tag' === $token_type ? ( $this->is_tag_closer() ? '-' : '+' ) : '';
		$op         = "{$op_sigil}{$tag_name}";

		switch ( $op ) {
			/*
			 * > A comment token
			 */
			case '#comment':
			case '#funky-comment':
			case '#presumptuous-tag':
				$this->bail( 'Content outside of HTML is unsupported.' );
				break;

			/*
			 * > A DOCTYPE token
			 * > A start tag whose tag name is "html"
			 *
			 * > Process the token using the rules for the "in body" insertion mode.
			 */
			case 'html':
			case '+HTML':
				return $this->step_in_body();

			/*
			 * > A character token that is one of U+0009 CHARACTER TABULATION, U+000A LINE FEED (LF),
			 * >   U+000C FORM FEED (FF), U+000D CARRIAGE RETURN (CR), or U+0020 SPACE
			 * >
			 * > Process the token using the rules for the "in body" insertion mode.
			 */
			case '#text':
				if ( parent::TEXT_IS_WHITESPACE === $this->text_node_classification ) {
					return $this->step_in_body();
				}
				goto after_after_body_anything_else;
				break;
		}

		/*
		 * > Parse error. Switch the insertion mode to "in body" and reprocess the token.
		 */
		after_after_body_anything_else:
		$this->state->insertion_mode = WP_HTML_Processor_State::INSERTION_MODE_IN_BODY;
		return $this->step( self::REPROCESS_CURRENT_NODE );
	}

	/**
	 * Parses next element in the 'after after frameset' insertion mode.
	 *
	 * This internal function performs the 'after after frameset' insertion mode
	 * logic for the generalized WP_HTML_Processor::step() function.
	 *
	 * @since 6.7.0 Stub implementation.
	 *
	 * @throws WP_HTML_Unsupported_Exception When encountering unsupported HTML input.
	 *
	 * @see https://html.spec.whatwg.org/#the-after-after-frameset-insertion-mode
	 * @see WP_HTML_Processor::step
	 *
	 * @return bool Whether an element was found.
	 */
	private function step_after_after_frameset(): bool {
		$tag_name   = $this->get_token_name();
		$token_type = $this->get_token_type();
		$op_sigil   = '#tag' === $token_type ? ( $this->is_tag_closer() ? '-' : '+' ) : '';
		$op         = "{$op_sigil}{$tag_name}";

		switch ( $op ) {
			/*
			 * > A comment token
			 */
			case '#comment':
			case '#funky-comment':
			case '#presumptuous-tag':
				$this->bail( 'Content outside of HTML is unsupported.' );
				break;

			/*
			 * > A DOCTYPE token
			 * > A start tag whose tag name is "html"
			 *
			 * > Process the token using the rules for the "in body" insertion mode.
			 */
			case 'html':
			case '+HTML':
				return $this->step_in_body();

			/*
			 * > A character token that is one of U+0009 CHARACTER TABULATION, U+000A LINE FEED (LF),
			 * >   U+000C FORM FEED (FF), U+000D CARRIAGE RETURN (CR), or U+0020 SPACE
			 * >
			 * > Process the token using the rules for the "in body" insertion mode.
			 *
			 * This algorithm effectively strips non-whitespace characters from text and inserts
			 * them under HTML. This is not supported at this time.
			 */
			case '#text':
				if ( parent::TEXT_IS_WHITESPACE === $this->text_node_classification ) {
					return $this->step_in_body();
				}
				$this->bail( 'Non-whitespace characters cannot be handled in after after frameset.' );
				break;

			/*
			 * > A start tag whose tag name is "noframes"
			 */
			case '+NOFRAMES':
				return $this->step_in_head();
		}

		// Parse error: ignore the token.
		return $this->step();
	}

	/**
	 * Parses next element in the 'in foreign content' insertion mode.
	 *
	 * This internal function performs the 'in foreign content' insertion mode
	 * logic for the generalized WP_HTML_Processor::step() function.
	 *
	 * @since 6.7.0 Stub implementation.
	 *
	 * @throws WP_HTML_Unsupported_Exception When encountering unsupported HTML input.
	 *
	 * @see https://html.spec.whatwg.org/#parsing-main-inforeign
	 * @see WP_HTML_Processor::step
	 *
	 * @return bool Whether an element was found.
	 */
	private function step_in_foreign_content(): bool {
		$tag_name   = $this->get_token_name();
		$token_type = $this->get_token_type();
		$op_sigil   = '#tag' === $token_type ? ( $this->is_tag_closer() ? '-' : '+' ) : '';
		$op         = "{$op_sigil}{$tag_name}";

		/*
		 * > A start tag whose name is "font", if the token has any attributes named "color", "face", or "size"
		 *
		 * This section drawn out above the switch to more easily incorporate
		 * the additional rules based on the presence of the attributes.
		 */
		if (
			'+FONT' === $op &&
			(
				null !== $this->get_attribute( 'color' ) ||
				null !== $this->get_attribute( 'face' ) ||
				null !== $this->get_attribute( 'size' )
			)
		) {
			$op = '+FONT with attributes';
		}

		switch ( $op ) {
			case '#text':
				/*
				 * > A character token that is U+0000 NULL
				 *
				 * This is handled by `get_modifiable_text()`.
				 */

				/*
				 * Whitespace-only text does not affect the frameset-ok flag.
				 * It is probably inter-element whitespace, but it may also
				 * contain character references which decode only to whitespace.
				 */
				if ( parent::TEXT_IS_GENERIC === $this->text_node_classification ) {
					$this->state->frameset_ok = false;
				}

				$this->insert_foreign_element( $this->state->current_token, false );
				return true;

			/*
			 * CDATA sections are alternate wrappers for text content and therefore
			 * ought to follow the same rules as text nodes.
			 */
			case '#cdata-section':
				/*
				 * NULL bytes and whitespace do not change the frameset-ok flag.
				 */
				$current_token        = $this->bookmarks[ $this->state->current_token->bookmark_name ];
				$cdata_content_start  = $current_token->start + 9;
				$cdata_content_length = $current_token->length - 12;
				if ( strspn( $this->html, "\0 \t\n\f\r", $cdata_content_start, $cdata_content_length ) !== $cdata_content_length ) {
					$this->state->frameset_ok = false;
				}

				$this->insert_foreign_element( $this->state->current_token, false );
				return true;

			/*
			 * > A comment token
			 */
			case '#comment':
			case '#funky-comment':
			case '#presumptuous-tag':
				$this->insert_foreign_element( $this->state->current_token, false );
				return true;

			/*
			 * > A DOCTYPE token
			 */
			case 'html':
				// Parse error: ignore the token.
				return $this->step();

			/*
			 * > A start tag whose tag name is "b", "big", "blockquote", "body", "br", "center",
			 * > "code", "dd", "div", "dl", "dt", "em", "embed", "h1", "h2", "h3", "h4", "h5",
			 * > "h6", "head", "hr", "i", "img", "li", "listing", "menu", "meta", "nobr", "ol",
			 * > "p", "pre", "ruby", "s", "small", "span", "strong", "strike", "sub", "sup",
			 * > "table", "tt", "u", "ul", "var"
			 *
			 * > A start tag whose name is "font", if the token has any attributes named "color", "face", or "size"
			 *
			 * > An end tag whose tag name is "br", "p"
			 *
			 * Closing BR tags are always reported by the Tag Processor as opening tags.
			 */
			case '+B':
			case '+BIG':
			case '+BLOCKQUOTE':
			case '+BODY':
			case '+BR':
			case '+CENTER':
			case '+CODE':
			case '+DD':
			case '+DIV':
			case '+DL':
			case '+DT':
			case '+EM':
			case '+EMBED':
			case '+H1':
			case '+H2':
			case '+H3':
			case '+H4':
			case '+H5':
			case '+H6':
			case '+HEAD':
			case '+HR':
			case '+I':
			case '+IMG':
			case '+LI':
			case '+LISTING':
			case '+MENU':
			case '+META':
			case '+NOBR':
			case '+OL':
			case '+P':
			case '+PRE':
			case '+RUBY':
			case '+S':
			case '+SMALL':
			case '+SPAN':
			case '+STRONG':
			case '+STRIKE':
			case '+SUB':
			case '+SUP':
			case '+TABLE':
			case '+TT':
			case '+U':
			case '+UL':
			case '+VAR':
			case '+FONT with attributes':
			case '-BR':
			case '-P':
				// @todo Indicate a parse error once it's possible.
				foreach ( $this->state->stack_of_open_elements->walk_up() as $current_node ) {
					if (
						'math' === $current_node->integration_node_type ||
						'html' === $current_node->integration_node_type ||
						'html' === $current_node->namespace
					) {
						break;
					}

					$this->state->stack_of_open_elements->pop();
				}
				goto in_foreign_content_process_in_current_insertion_mode;
		}

		/*
		 * > Any other start tag
		 */
		if ( ! $this->is_tag_closer() ) {
			$this->insert_foreign_element( $this->state->current_token, false );

			/*
			 * > If the token has its self-closing flag set, then run
			 * > the appropriate steps from the following list:
			 * >
			 * >   ↪ the token's tag name is "script", and the new current node is in the SVG namespace
			 * >         Acknowledge the token's self-closing flag, and then act as
			 * >         described in the steps for a "script" end tag below.
			 * >
			 * >   ↪ Otherwise
			 * >         Pop the current node off the stack of open elements and
			 * >         acknowledge the token's self-closing flag.
			 *
			 * Since the rules for SCRIPT below indicate to pop the element off of the stack of
			 * open elements, which is the same for the Otherwise condition, there's no need to
			 * separate these checks. The difference comes when a parser operates with the scripting
			 * flag enabled, and executes the script, which this parser does not support.
			 */
			if ( $this->state->current_token->has_self_closing_flag ) {
				$this->state->stack_of_open_elements->pop();
			}
			return true;
		}

		/*
		 * > An end tag whose name is "script", if the current node is an SVG script element.
		 */
		if ( $this->is_tag_closer() && 'SCRIPT' === $this->state->current_token->node_name && 'svg' === $this->state->current_token->namespace ) {
			$this->state->stack_of_open_elements->pop();
			return true;
		}

		/*
		 * > Any other end tag
		 */
		if ( $this->is_tag_closer() ) {
			$node = $this->state->stack_of_open_elements->current_node();
			if ( $tag_name !== $node->node_name ) {
				// @todo Indicate a parse error once it's possible.
			}
			in_foreign_content_end_tag_loop:
			if ( $node === $this->state->stack_of_open_elements->at( 1 ) ) {
				return true;
			}

			/*
			 * > If node's tag name, converted to ASCII lowercase, is the same as the tag name
			 * > of the token, pop elements from the stack of open elements until node has
			 * > been popped from the stack, and then return.
			 */
			if ( 0 === strcasecmp( $node->node_name, $tag_name ) ) {
				foreach ( $this->state->stack_of_open_elements->walk_up() as $item ) {
					$this->state->stack_of_open_elements->pop();
					if ( $node === $item ) {
						return true;
					}
				}
			}

			foreach ( $this->state->stack_of_open_elements->walk_up( $node ) as $item ) {
				$node = $item;
				break;
			}

			if ( 'html' !== $node->namespace ) {
				goto in_foreign_content_end_tag_loop;
			}

			in_foreign_content_process_in_current_insertion_mode:
			switch ( $this->state->insertion_mode ) {
				case WP_HTML_Processor_State::INSERTION_MODE_INITIAL:
					return $this->step_initial();

				case WP_HTML_Processor_State::INSERTION_MODE_BEFORE_HTML:
					return $this->step_before_html();

				case WP_HTML_Processor_State::INSERTION_MODE_BEFORE_HEAD:
					return $this->step_before_head();

				case WP_HTML_Processor_State::INSERTION_MODE_IN_HEAD:
					return $this->step_in_head();

				case WP_HTML_Processor_State::INSERTION_MODE_IN_HEAD_NOSCRIPT:
					return $this->step_in_head_noscript();

				case WP_HTML_Processor_State::INSERTION_MODE_AFTER_HEAD:
					return $this->step_after_head();

				case WP_HTML_Processor_State::INSERTION_MODE_IN_BODY:
					return $this->step_in_body();

				case WP_HTML_Processor_State::INSERTION_MODE_IN_TABLE:
					return $this->step_in_table();

				case WP_HTML_Processor_State::INSERTION_MODE_IN_TABLE_TEXT:
					return $this->step_in_table_text();

				case WP_HTML_Processor_State::INSERTION_MODE_IN_CAPTION:
					return $this->step_in_caption();

				case WP_HTML_Processor_State::INSERTION_MODE_IN_COLUMN_GROUP:
					return $this->step_in_column_group();

				case WP_HTML_Processor_State::INSERTION_MODE_IN_TABLE_BODY:
					return $this->step_in_table_body();

				case WP_HTML_Processor_State::INSERTION_MODE_IN_ROW:
					return $this->step_in_row();

				case WP_HTML_Processor_State::INSERTION_MODE_IN_CELL:
					return $this->step_in_cell();

				case WP_HTML_Processor_State::INSERTION_MODE_IN_SELECT:
					return $this->step_in_select();

				case WP_HTML_Processor_State::INSERTION_MODE_IN_SELECT_IN_TABLE:
					return $this->step_in_select_in_table();

				case WP_HTML_Processor_State::INSERTION_MODE_IN_TEMPLATE:
					return $this->step_in_template();

				case WP_HTML_Processor_State::INSERTION_MODE_AFTER_BODY:
					return $this->step_after_body();

				case WP_HTML_Processor_State::INSERTION_MODE_IN_FRAMESET:
					return $this->step_in_frameset();

				case WP_HTML_Processor_State::INSERTION_MODE_AFTER_FRAMESET:
					return $this->step_after_frameset();

				case WP_HTML_Processor_State::INSERTION_MODE_AFTER_AFTER_BODY:
					return $this->step_after_after_body();

				case WP_HTML_Processor_State::INSERTION_MODE_AFTER_AFTER_FRAMESET:
					return $this->step_after_after_frameset();

				// This should be unreachable but PHP doesn't have total type checking on switch.
				default:
					$this->bail( "Unaware of the requested parsing mode: '{$this->state->insertion_mode}'." );
			}
		}

		$this->bail( 'Should not have been able to reach end of IN FOREIGN CONTENT processing. Check HTML API code.' );
		// This unnecessary return prevents tools from inaccurately reporting type errors.
		return false;
	}

	/*
	 * Internal helpers
	 */

	/**
	 * Creates a new bookmark for the currently-matched token and returns the generated name.
	 *
	 * @since 6.4.0
	 * @since 6.5.0 Renamed from bookmark_tag() to bookmark_token().
	 *
	 * @throws Exception When unable to allocate requested bookmark.
	 *
	 * @return string|false Name of created bookmark, or false if unable to create.
	 */
	private function bookmark_token() {
		if ( ! parent::set_bookmark( ++$this->bookmark_counter ) ) {
			$this->last_error = self::ERROR_EXCEEDED_MAX_BOOKMARKS;
			throw new Exception( 'could not allocate bookmark' );
		}

		return "{$this->bookmark_counter}";
	}

	/*
	 * HTML semantic overrides for Tag Processor
	 */

	/**
	 * Indicates the namespace of the current token, or "html" if there is none.
	 *
	 * @return string One of "html", "math", or "svg".
	 */
	public function get_namespace(): string {
		if ( ! isset( $this->current_element ) ) {
			return parent::get_namespace();
		}

		return $this->current_element->token->namespace;
	}

	/**
	 * Returns the uppercase name of the matched tag.
	 *
	 * The semantic rules for HTML specify that certain tags be reprocessed
	 * with a different tag name. Because of this, the tag name presented
	 * by the HTML Processor may differ from the one reported by the HTML
	 * Tag Processor, which doesn't apply these semantic rules.
	 *
	 * Example:
	 *
	 *     $processor = new WP_HTML_Tag_Processor( '<div class="test">Test</div>' );
	 *     $processor->next_tag() === true;
	 *     $processor->get_tag() === 'DIV';
	 *
	 *     $processor->next_tag() === false;
	 *     $processor->get_tag() === null;
	 *
	 * @since 6.4.0
	 *
	 * @return string|null Name of currently matched tag in input HTML, or `null` if none found.
	 */
	public function get_tag(): ?string {
		if ( null !== $this->last_error ) {
			return null;
		}

		if ( $this->is_virtual() ) {
			return $this->current_element->token->node_name;
		}

		$tag_name = parent::get_tag();

		/*
		 * > A start tag whose tag name is "image"
		 * > Change the token's tag name to "img" and reprocess it. (Don't ask.)
		 */
		return ( 'IMAGE' === $tag_name && 'html' === $this->get_namespace() )
			? 'IMG'
			: $tag_name;
	}

	/**
	 * Indicates if the currently matched tag contains the self-closing flag.
	 *
	 * No HTML elements ought to have the self-closing flag and for those, the self-closing
	 * flag will be ignored. For void elements this is benign because they "self close"
	 * automatically. For non-void HTML elements though problems will appear if someone
	 * intends to use a self-closing element in place of that element with an empty body.
	 * For HTML foreign elements and custom elements the self-closing flag determines if
	 * they self-close or not.
	 *
	 * This function does not determine if a tag is self-closing,
	 * but only if the self-closing flag is present in the syntax.
	 *
	 * @since 6.6.0 Subclassed for the HTML Processor.
	 *
	 * @return bool Whether the currently matched tag contains the self-closing flag.
	 */
	public function has_self_closing_flag(): bool {
		return $this->is_virtual() ? false : parent::has_self_closing_flag();
	}

	/**
	 * Returns the node name represented by the token.
	 *
	 * This matches the DOM API value `nodeName`. Some values
	 * are static, such as `#text` for a text node, while others
	 * are dynamically generated from the token itself.
	 *
	 * Dynamic names:
	 *  - Uppercase tag name for tag matches.
	 *  - `html` for DOCTYPE declarations.
	 *
	 * Note that if the Tag Processor is not matched on a token
	 * then this function will return `null`, either because it
	 * hasn't yet found a token or because it reached the end
	 * of the document without matching a token.
	 *
	 * @since 6.6.0 Subclassed for the HTML Processor.
	 *
	 * @return string|null Name of the matched token.
	 */
	public function get_token_name(): ?string {
		return $this->is_virtual()
			? $this->current_element->token->node_name
			: parent::get_token_name();
	}

	/**
	 * Indicates the kind of matched token, if any.
	 *
	 * This differs from `get_token_name()` in that it always
	 * returns a static string indicating the type, whereas
	 * `get_token_name()` may return values derived from the
	 * token itself, such as a tag name or processing
	 * instruction tag.
	 *
	 * Possible values:
	 *  - `#tag` when matched on a tag.
	 *  - `#text` when matched on a text node.
	 *  - `#cdata-section` when matched on a CDATA node.
	 *  - `#comment` when matched on a comment.
	 *  - `#doctype` when matched on a DOCTYPE declaration.
	 *  - `#presumptuous-tag` when matched on an empty tag closer.
	 *  - `#funky-comment` when matched on a funky comment.
	 *
	 * @since 6.6.0 Subclassed for the HTML Processor.
	 *
	 * @return string|null What kind of token is matched, or null.
	 */
	public function get_token_type(): ?string {
		if ( $this->is_virtual() ) {
			/*
			 * This logic comes from the Tag Processor.
			 *
			 * @todo It would be ideal not to repeat this here, but it's not clearly
			 *       better to allow passing a token name to `get_token_type()`.
			 */
			$node_name     = $this->current_element->token->node_name;
			$starting_char = $node_name[0];
			if ( 'A' <= $starting_char && 'Z' >= $starting_char ) {
				return '#tag';
			}

			if ( 'html' === $node_name ) {
				return '#doctype';
			}

			return $node_name;
		}

		return parent::get_token_type();
	}

	/**
	 * Returns the value of a requested attribute from a matched tag opener if that attribute exists.
	 *
	 * Example:
	 *
	 *     $p = WP_HTML_Processor::create_fragment( '<div enabled class="test" data-test-id="14">Test</div>' );
	 *     $p->next_token() === true;
	 *     $p->get_attribute( 'data-test-id' ) === '14';
	 *     $p->get_attribute( 'enabled' ) === true;
	 *     $p->get_attribute( 'aria-label' ) === null;
	 *
	 *     $p->next_tag() === false;
	 *     $p->get_attribute( 'class' ) === null;
	 *
	 * @since 6.6.0 Subclassed for HTML Processor.
	 *
	 * @param string $name Name of attribute whose value is requested.
	 * @return string|true|null Value of attribute or `null` if not available. Boolean attributes return `true`.
	 */
	public function get_attribute( $name ) {
		return $this->is_virtual() ? null : parent::get_attribute( $name );
	}

	/**
	 * Updates or creates a new attribute on the currently matched tag with the passed value.
	 *
	 * For boolean attributes special handling is provided:
	 *  - When `true` is passed as the value, then only the attribute name is added to the tag.
	 *  - When `false` is passed, the attribute gets removed if it existed before.
	 *
	 * For string attributes, the value is escaped using the `esc_attr` function.
	 *
	 * @since 6.6.0 Subclassed for the HTML Processor.
	 *
	 * @param string      $name  The attribute name to target.
	 * @param string|bool $value The new attribute value.
	 * @return bool Whether an attribute value was set.
	 */
	public function set_attribute( $name, $value ): bool {
		return $this->is_virtual() ? false : parent::set_attribute( $name, $value );
	}

	/**
	 * Remove an attribute from the currently-matched tag.
	 *
	 * @since 6.6.0 Subclassed for HTML Processor.
	 *
	 * @param string $name The attribute name to remove.
	 * @return bool Whether an attribute was removed.
	 */
	public function remove_attribute( $name ): bool {
		return $this->is_virtual() ? false : parent::remove_attribute( $name );
	}

	/**
	 * Gets lowercase names of all attributes matching a given prefix in the current tag.
	 *
	 * Note that matching is case-insensitive. This is in accordance with the spec:
	 *
	 * > There must never be two or more attributes on
	 * > the same start tag whose names are an ASCII
	 * > case-insensitive match for each other.
	 *     - HTML 5 spec
	 *
	 * Example:
	 *
	 *     $p = new WP_HTML_Tag_Processor( '<div data-ENABLED class="test" DATA-test-id="14">Test</div>' );
	 *     $p->next_tag( array( 'class_name' => 'test' ) ) === true;
	 *     $p->get_attribute_names_with_prefix( 'data-' ) === array( 'data-enabled', 'data-test-id' );
	 *
	 *     $p->next_tag() === false;
	 *     $p->get_attribute_names_with_prefix( 'data-' ) === null;
	 *
	 * @since 6.6.0 Subclassed for the HTML Processor.
	 *
	 * @see https://html.spec.whatwg.org/multipage/syntax.html#attributes-2:ascii-case-insensitive
	 *
	 * @param string $prefix Prefix of requested attribute names.
	 * @return array|null List of attribute names, or `null` when no tag opener is matched.
	 */
	public function get_attribute_names_with_prefix( $prefix ): ?array {
		return $this->is_virtual() ? null : parent::get_attribute_names_with_prefix( $prefix );
	}

	/**
	 * Adds a new class name to the currently matched tag.
	 *
	 * @since 6.6.0 Subclassed for the HTML Processor.
	 *
	 * @param string $class_name The class name to add.
	 * @return bool Whether the class was set to be added.
	 */
	public function add_class( $class_name ): bool {
		return $this->is_virtual() ? false : parent::add_class( $class_name );
	}

	/**
	 * Removes a class name from the currently matched tag.
	 *
	 * @since 6.6.0 Subclassed for the HTML Processor.
	 *
	 * @param string $class_name The class name to remove.
	 * @return bool Whether the class was set to be removed.
	 */
	public function remove_class( $class_name ): bool {
		return $this->is_virtual() ? false : parent::remove_class( $class_name );
	}

	/**
	 * Returns if a matched tag contains the given ASCII case-insensitive class name.
	 *
	 * @since 6.6.0 Subclassed for the HTML Processor.
	 *
	 * @todo When reconstructing active formatting elements with attributes, find a way
	 *       to indicate if the virtually-reconstructed formatting elements contain the
	 *       wanted class name.
	 *
	 * @param string $wanted_class Look for this CSS class name, ASCII case-insensitive.
	 * @return bool|null Whether the matched tag contains the given class name, or null if not matched.
	 */
	public function has_class( $wanted_class ): ?bool {
		return $this->is_virtual() ? null : parent::has_class( $wanted_class );
	}

	/**
	 * Generator for a foreach loop to step through each class name for the matched tag.
	 *
	 * This generator function is designed to be used inside a "foreach" loop.
	 *
	 * Example:
	 *
	 *     $p = WP_HTML_Processor::create_fragment( "<div class='free &lt;egg&lt;\tlang-en'>" );
	 *     $p->next_tag();
	 *     foreach ( $p->class_list() as $class_name ) {
	 *         echo "{$class_name} ";
	 *     }
	 *     // Outputs: "free <egg> lang-en "
	 *
	 * @since 6.6.0 Subclassed for the HTML Processor.
	 */
	public function class_list() {
		return $this->is_virtual() ? null : parent::class_list();
	}

	/**
	 * Returns the modifiable text for a matched token, or an empty string.
	 *
	 * Modifiable text is text content that may be read and changed without
	 * changing the HTML structure of the document around it. This includes
	 * the contents of `#text` nodes in the HTML as well as the inner
	 * contents of HTML comments, Processing Instructions, and others, even
	 * though these nodes aren't part of a parsed DOM tree. They also contain
	 * the contents of SCRIPT and STYLE tags, of TEXTAREA tags, and of any
	 * other section in an HTML document which cannot contain HTML markup (DATA).
	 *
	 * If a token has no modifiable text then an empty string is returned to
	 * avoid needless crashing or type errors. An empty string does not mean
	 * that a token has modifiable text, and a token with modifiable text may
	 * have an empty string (e.g. a comment with no contents).
	 *
	 * @since 6.6.0 Subclassed for the HTML Processor.
	 *
	 * @return string
	 */
	public function get_modifiable_text(): string {
		return $this->is_virtual() ? '' : parent::get_modifiable_text();
	}

	/**
	 * Indicates what kind of comment produced the comment node.
	 *
	 * Because there are different kinds of HTML syntax which produce
	 * comments, the Tag Processor tracks and exposes this as a type
	 * for the comment. Nominally only regular HTML comments exist as
	 * they are commonly known, but a number of unrelated syntax errors
	 * also produce comments.
	 *
	 * @see self::COMMENT_AS_ABRUPTLY_CLOSED_COMMENT
	 * @see self::COMMENT_AS_CDATA_LOOKALIKE
	 * @see self::COMMENT_AS_INVALID_HTML
	 * @see self::COMMENT_AS_HTML_COMMENT
	 * @see self::COMMENT_AS_PI_NODE_LOOKALIKE
	 *
	 * @since 6.6.0 Subclassed for the HTML Processor.
	 *
	 * @return string|null
	 */
	public function get_comment_type(): ?string {
		return $this->is_virtual() ? null : parent::get_comment_type();
	}

	/**
	 * Removes a bookmark that is no longer needed.
	 *
	 * Releasing a bookmark frees up the small
	 * performance overhead it requires.
	 *
	 * @since 6.4.0
	 *
	 * @param string $bookmark_name Name of the bookmark to remove.
	 * @return bool Whether the bookmark already existed before removal.
	 */
	public function release_bookmark( $bookmark_name ): bool {
		return parent::release_bookmark( "_{$bookmark_name}" );
	}

	/**
	 * Moves the internal cursor in the HTML Processor to a given bookmark's location.
	 *
	 * Be careful! Seeking backwards to a previous location resets the parser to the
	 * start of the document and reparses the entire contents up until it finds the
	 * sought-after bookmarked location.
	 *
	 * In order to prevent accidental infinite loops, there's a
	 * maximum limit on the number of times seek() can be called.
	 *
	 * @throws Exception When unable to allocate a bookmark for the next token in the input HTML document.
	 *
	 * @since 6.4.0
	 *
	 * @param string $bookmark_name Jump to the place in the document identified by this bookmark name.
	 * @return bool Whether the internal cursor was successfully moved to the bookmark's location.
	 */
	public function seek( $bookmark_name ): bool {
		// Flush any pending updates to the document before beginning.
		$this->get_updated_html();

		$actual_bookmark_name = "_{$bookmark_name}";
		$processor_started_at = $this->state->current_token
			? $this->bookmarks[ $this->state->current_token->bookmark_name ]->start
			: 0;
		$bookmark_starts_at   = $this->bookmarks[ $actual_bookmark_name ]->start;
		$direction            = $bookmark_starts_at > $processor_started_at ? 'forward' : 'backward';

		/*
		 * If seeking backwards, it's possible that the sought-after bookmark exists within an element
		 * which has been closed before the current cursor; in other words, it has already been removed
		 * from the stack of open elements. This means that it's insufficient to simply pop off elements
		 * from the stack of open elements which appear after the bookmarked location and then jump to
		 * that location, as the elements which were open before won't be re-opened.
		 *
		 * In order to maintain consistency, the HTML Processor rewinds to the start of the document
		 * and reparses everything until it finds the sought-after bookmark.
		 *
		 * There are potentially better ways to do this: cache the parser state for each bookmark and
		 * restore it when seeking; store an immutable and idempotent register of where elements open
		 * and close.
		 *
		 * If caching the parser state it will be essential to properly maintain the cached stack of
		 * open elements and active formatting elements when modifying the document. This could be a
		 * tedious and time-consuming process as well, and so for now will not be performed.
		 *
		 * It may be possible to track bookmarks for where elements open and close, and in doing so
		 * be able to quickly recalculate breadcrumbs for any element in the document. It may even
		 * be possible to remove the stack of open elements and compute it on the fly this way.
		 * If doing this, the parser would need to track the opening and closing locations for all
		 * tokens in the breadcrumb path for any and all bookmarks. By utilizing bookmarks themselves
		 * this list could be automatically maintained while modifying the document. Finding the
		 * breadcrumbs would then amount to traversing that list from the start until the token
		 * being inspected. Once an element closes, if there are no bookmarks pointing to locations
		 * within that element, then all of these locations may be forgotten to save on memory use
		 * and computation time.
		 */
		if ( 'backward' === $direction ) {

			/*
			 * When moving backward, stateful stacks should be cleared.
			 */
			foreach ( $this->state->stack_of_open_elements->walk_up() as $item ) {
				$this->state->stack_of_open_elements->remove_node( $item );
			}

			foreach ( $this->state->active_formatting_elements->walk_up() as $item ) {
				$this->state->active_formatting_elements->remove_node( $item );
			}

			/*
			 * **After** clearing stacks, more processor state can be reset.
			 * This must be done after clearing the stack because those stacks generate events that
			 * would appear on a subsequent call to `next_token()`.
			 */
			$this->state->frameset_ok                       = true;
			$this->state->stack_of_template_insertion_modes = array();
			$this->state->head_element                      = null;
			$this->state->form_element                      = null;
			$this->state->current_token                     = null;
			$this->current_element                          = null;
			$this->element_queue                            = array();

			/*
			 * The absence of a context node indicates a full parse.
			 * The presence of a context node indicates a fragment parser.
			 */
			if ( null === $this->context_node ) {
				$this->change_parsing_namespace( 'html' );
				$this->state->insertion_mode = WP_HTML_Processor_State::INSERTION_MODE_INITIAL;
				$this->breadcrumbs           = array();

				$this->bookmarks['initial'] = new WP_HTML_Span( 0, 0 );
				parent::seek( 'initial' );
				unset( $this->bookmarks['initial'] );
			} else {

				/*
				 * Push the root-node (HTML) back onto the stack of open elements.
				 *
				 * Fragment parsers require this extra bit of setup.
				 * It's handled in full parsers by advancing the processor state.
				 */
				$this->state->stack_of_open_elements->push(
					new WP_HTML_Token(
						'root-node',
						'HTML',
						false
					)
				);

				$this->change_parsing_namespace(
					$this->context_node->integration_node_type
						? 'html'
						: $this->context_node->namespace
				);

				if ( 'TEMPLATE' === $this->context_node->node_name ) {
					$this->state->stack_of_template_insertion_modes[] = WP_HTML_Processor_State::INSERTION_MODE_IN_TEMPLATE;
				}

				$this->reset_insertion_mode_appropriately();
				$this->breadcrumbs = array_slice( $this->breadcrumbs, 0, 2 );
				parent::seek( $this->context_node->bookmark_name );
			}
		}

		/*
		 * Here, the processor moves forward through the document until it matches the bookmark.
		 * do-while is used here because the processor is expected to already be stopped on
		 * a token than may match the bookmarked location.
		 */
		do {
			/*
			 * The processor will stop on virtual tokens, but bookmarks may not be set on them.
			 * They should not be matched when seeking a bookmark, skip them.
			 */
			if ( $this->is_virtual() ) {
				continue;
			}
			if ( $bookmark_starts_at === $this->bookmarks[ $this->state->current_token->bookmark_name ]->start ) {
				return true;
			}
		} while ( $this->next_token() );

		return false;
	}

	/**
	 * Sets a bookmark in the HTML document.
	 *
	 * Bookmarks represent specific places or tokens in the HTML
	 * document, such as a tag opener or closer. When applying
	 * edits to a document, such as setting an attribute, the
	 * text offsets of that token may shift; the bookmark is
	 * kept updated with those shifts and remains stable unless
	 * the entire span of text in which the token sits is removed.
	 *
	 * Release bookmarks when they are no longer needed.
	 *
	 * Example:
	 *
	 *     <main><h2>Surprising fact you may not know!</h2></main>
	 *           ^  ^
	 *            \-|-- this `H2` opener bookmark tracks the token
	 *
	 *     <main class="clickbait"><h2>Surprising fact you may no…
	 *                             ^  ^
	 *                              \-|-- it shifts with edits
	 *
	 * Bookmarks provide the ability to seek to a previously-scanned
	 * place in the HTML document. This avoids the need to re-scan
	 * the entire document.
	 *
	 * Example:
	 *
	 *     <ul><li>One</li><li>Two</li><li>Three</li></ul>
	 *                                 ^^^^
	 *                                 want to note this last item
	 *
	 *     $p = new WP_HTML_Tag_Processor( $html );
	 *     $in_list = false;
	 *     while ( $p->next_tag( array( 'tag_closers' => $in_list ? 'visit' : 'skip' ) ) ) {
	 *         if ( 'UL' === $p->get_tag() ) {
	 *             if ( $p->is_tag_closer() ) {
	 *                 $in_list = false;
	 *                 $p->set_bookmark( 'resume' );
	 *                 if ( $p->seek( 'last-li' ) ) {
	 *                     $p->add_class( 'last-li' );
	 *                 }
	 *                 $p->seek( 'resume' );
	 *                 $p->release_bookmark( 'last-li' );
	 *                 $p->release_bookmark( 'resume' );
	 *             } else {
	 *                 $in_list = true;
	 *             }
	 *         }
	 *
	 *         if ( 'LI' === $p->get_tag() ) {
	 *             $p->set_bookmark( 'last-li' );
	 *         }
	 *     }
	 *
	 * Bookmarks intentionally hide the internal string offsets
	 * to which they refer. They are maintained internally as
	 * updates are applied to the HTML document and therefore
	 * retain their "position" - the location to which they
	 * originally pointed. The inability to use bookmarks with
	 * functions like `substr` is therefore intentional to guard
	 * against accidentally breaking the HTML.
	 *
	 * Because bookmarks allocate memory and require processing
	 * for every applied update, they are limited and require
	 * a name. They should not be created with programmatically-made
	 * names, such as "li_{$index}" with some loop. As a general
	 * rule they should only be created with string-literal names
	 * like "start-of-section" or "last-paragraph".
	 *
	 * Bookmarks are a powerful tool to enable complicated behavior.
	 * Consider double-checking that you need this tool if you are
	 * reaching for it, as inappropriate use could lead to broken
	 * HTML structure or unwanted processing overhead.
	 *
	 * Bookmarks cannot be set on tokens that do no appear in the original
	 * HTML text. For example, the HTML `<table><td>` stops at tags `TABLE`,
	 * `TBODY`, `TR`, and `TD`. The `TBODY` and `TR` tags do not appear in
	 * the original HTML and cannot be used as bookmarks.
	 *
	 * @since 6.4.0
	 *
	 * @param string $bookmark_name Identifies this particular bookmark.
	 * @return bool Whether the bookmark was successfully created.
	 */
	public function set_bookmark( $bookmark_name ): bool {
		if ( $this->is_virtual() ) {
			_doing_it_wrong(
				__METHOD__,
				__( 'Cannot set bookmarks on tokens that do no appear in the original HTML text.' ),
				'6.8.0'
			);
			return false;
		}
		return parent::set_bookmark( "_{$bookmark_name}" );
	}

	/**
	 * Checks whether a bookmark with the given name exists.
	 *
	 * @since 6.5.0
	 *
	 * @param string $bookmark_name Name to identify a bookmark that potentially exists.
	 * @return bool Whether that bookmark exists.
	 */
	public function has_bookmark( $bookmark_name ): bool {
		return parent::has_bookmark( "_{$bookmark_name}" );
	}

	/*
	 * HTML Parsing Algorithms
	 */

	/**
	 * Closes a P element.
	 *
	 * @since 6.4.0
	 *
	 * @throws WP_HTML_Unsupported_Exception When encountering unsupported HTML input.
	 *
	 * @see https://html.spec.whatwg.org/#close-a-p-element
	 */
	private function close_a_p_element(): void {
		$this->generate_implied_end_tags( 'P' );
		$this->state->stack_of_open_elements->pop_until( 'P' );
	}

	/**
	 * Closes elements that have implied end tags.
	 *
	 * @since 6.4.0
	 * @since 6.7.0 Full spec support.
	 *
	 * @see https://html.spec.whatwg.org/#generate-implied-end-tags
	 *
	 * @param string|null $except_for_this_element Perform as if this element doesn't exist in the stack of open elements.
	 */
	private function generate_implied_end_tags( ?string $except_for_this_element = null ): void {
		$elements_with_implied_end_tags = array(
			'DD',
			'DT',
			'LI',
			'OPTGROUP',
			'OPTION',
			'P',
			'RB',
			'RP',
			'RT',
			'RTC',
		);

		$no_exclusions = ! isset( $except_for_this_element );

		while (
			( $no_exclusions || ! $this->state->stack_of_open_elements->current_node_is( $except_for_this_element ) ) &&
			in_array( $this->state->stack_of_open_elements->current_node()->node_name, $elements_with_implied_end_tags, true )
		) {
			$this->state->stack_of_open_elements->pop();
		}
	}

	/**
	 * Closes elements that have implied end tags, thoroughly.
	 *
	 * See the HTML specification for an explanation why this is
	 * different from generating end tags in the normal sense.
	 *
	 * @since 6.4.0
	 * @since 6.7.0 Full spec support.
	 *
	 * @see WP_HTML_Processor::generate_implied_end_tags
	 * @see https://html.spec.whatwg.org/#generate-implied-end-tags
	 */
	private function generate_implied_end_tags_thoroughly(): void {
		$elements_with_implied_end_tags = array(
			'CAPTION',
			'COLGROUP',
			'DD',
			'DT',
			'LI',
			'OPTGROUP',
			'OPTION',
			'P',
			'RB',
			'RP',
			'RT',
			'RTC',
			'TBODY',
			'TD',
			'TFOOT',
			'TH',
			'THEAD',
			'TR',
		);

		while ( in_array( $this->state->stack_of_open_elements->current_node()->node_name, $elements_with_implied_end_tags, true ) ) {
			$this->state->stack_of_open_elements->pop();
		}
	}

	/**
	 * Returns the adjusted current node.
	 *
	 * > The adjusted current node is the context element if the parser was created as
	 * > part of the HTML fragment parsing algorithm and the stack of open elements
	 * > has only one element in it (fragment case); otherwise, the adjusted current
	 * > node is the current node.
	 *
	 * @see https://html.spec.whatwg.org/#adjusted-current-node
	 *
	 * @since 6.7.0
	 *
	 * @return WP_HTML_Token|null The adjusted current node.
	 */
	private function get_adjusted_current_node(): ?WP_HTML_Token {
		if ( isset( $this->context_node ) && 1 === $this->state->stack_of_open_elements->count() ) {
			return $this->context_node;
		}

		return $this->state->stack_of_open_elements->current_node();
	}

	/**
	 * Reconstructs the active formatting elements.
	 *
	 * > This has the effect of reopening all the formatting elements that were opened
	 * > in the current body, cell, or caption (whichever is youngest) that haven't
	 * > been explicitly closed.
	 *
	 * @since 6.4.0
	 *
	 * @throws WP_HTML_Unsupported_Exception When encountering unsupported HTML input.
	 *
	 * @see https://html.spec.whatwg.org/#reconstruct-the-active-formatting-elements
	 *
	 * @return bool Whether any formatting elements needed to be reconstructed.
	 */
	private function reconstruct_active_formatting_elements(): bool {
		/*
		 * > If there are no entries in the list of active formatting elements, then there is nothing
		 * > to reconstruct; stop this algorithm.
		 */
		if ( 0 === $this->state->active_formatting_elements->count() ) {
			return false;
		}

		$last_entry = $this->state->active_formatting_elements->current_node();
		if (

			/*
			 * > If the last (most recently added) entry in the list of active formatting elements is a marker;
			 * > stop this algorithm.
			 */
			'marker' === $last_entry->node_name ||

			/*
			 * > If the last (most recently added) entry in the list of active formatting elements is an
			 * > element that is in the stack of open elements, then there is nothing to reconstruct;
			 * > stop this algorithm.
			 */
			$this->state->stack_of_open_elements->contains_node( $last_entry )
		) {
			return false;
		}

		$this->bail( 'Cannot reconstruct active formatting elements when advancing and rewinding is required.' );
	}

	/**
	 * Runs the reset the insertion mode appropriately algorithm.
	 *
	 * @since 6.7.0
	 *
	 * @see https://html.spec.whatwg.org/multipage/parsing.html#reset-the-insertion-mode-appropriately
	 */
	private function reset_insertion_mode_appropriately(): void {
		// Set the first node.
		$first_node = null;
		foreach ( $this->state->stack_of_open_elements->walk_down() as $first_node ) {
			break;
		}

		/*
		 * > 1. Let _last_ be false.
		 */
		$last = false;
		foreach ( $this->state->stack_of_open_elements->walk_up() as $node ) {
			/*
			 * > 2. Let _node_ be the last node in the stack of open elements.
			 * > 3. _Loop_: If _node_ is the first node in the stack of open elements, then set _last_
			 * >            to true, and, if the parser was created as part of the HTML fragment parsing
			 * >            algorithm (fragment case), set node to the context element passed to
			 * >            that algorithm.
			 * > …
			 */
			if ( $node === $first_node ) {
				$last = true;
				if ( isset( $this->context_node ) ) {
					$node = $this->context_node;
				}
			}

			// All of the following rules are for matching HTML elements.
			if ( 'html' !== $node->namespace ) {
				continue;
			}

			switch ( $node->node_name ) {
				/*
				 * > 4. If node is a `select` element, run these substeps:
				 * >   1. If _last_ is true, jump to the step below labeled done.
				 * >   2. Let _ancestor_ be _node_.
				 * >   3. _Loop_: If _ancestor_ is the first node in the stack of open elements,
				 * >      jump to the step below labeled done.
				 * >   4. Let ancestor be the node before ancestor in the stack of open elements.
				 * >   …
				 * >   7. Jump back to the step labeled _loop_.
				 * >   8. _Done_: Switch the insertion mode to "in select" and return.
				 */
				case 'SELECT':
					if ( ! $last ) {
						foreach ( $this->state->stack_of_open_elements->walk_up( $node ) as $ancestor ) {
							if ( 'html' !== $ancestor->namespace ) {
								continue;
							}

							switch ( $ancestor->node_name ) {
								/*
								 * > 5. If _ancestor_ is a `template` node, jump to the step below
								 * >    labeled _done_.
								 */
								case 'TEMPLATE':
									break 2;

								/*
								 * > 6. If _ancestor_ is a `table` node, switch the insertion mode to
								 * >    "in select in table" and return.
								 */
								case 'TABLE':
									$this->state->insertion_mode = WP_HTML_Processor_State::INSERTION_MODE_IN_SELECT_IN_TABLE;
									return;
							}
						}
					}
					$this->state->insertion_mode = WP_HTML_Processor_State::INSERTION_MODE_IN_SELECT;
					return;

				/*
				 * > 5. If _node_ is a `td` or `th` element and _last_ is false, then switch the
				 * >    insertion mode to "in cell" and return.
				 */
				case 'TD':
				case 'TH':
					if ( ! $last ) {
						$this->state->insertion_mode = WP_HTML_Processor_State::INSERTION_MODE_IN_CELL;
						return;
					}
					break;

					/*
					* > 6. If _node_ is a `tr` element, then switch the insertion mode to "in row"
					* >    and return.
					*/
				case 'TR':
					$this->state->insertion_mode = WP_HTML_Processor_State::INSERTION_MODE_IN_ROW;
					return;

				/*
				 * > 7. If _node_ is a `tbody`, `thead`, or `tfoot` element, then switch the
				 * >    insertion mode to "in table body" and return.
				 */
				case 'TBODY':
				case 'THEAD':
				case 'TFOOT':
					$this->state->insertion_mode = WP_HTML_Processor_State::INSERTION_MODE_IN_TABLE_BODY;
					return;

				/*
				 * > 8. If _node_ is a `caption` element, then switch the insertion mode to
				 * >    "in caption" and return.
				 */
				case 'CAPTION':
					$this->state->insertion_mode = WP_HTML_Processor_State::INSERTION_MODE_IN_CAPTION;
					return;

				/*
				 * > 9. If _node_ is a `colgroup` element, then switch the insertion mode to
				 * >    "in column group" and return.
				 */
				case 'COLGROUP':
					$this->state->insertion_mode = WP_HTML_Processor_State::INSERTION_MODE_IN_COLUMN_GROUP;
					return;

				/*
				 * > 10. If _node_ is a `table` element, then switch the insertion mode to
				 * >     "in table" and return.
				 */
				case 'TABLE':
					$this->state->insertion_mode = WP_HTML_Processor_State::INSERTION_MODE_IN_TABLE;
					return;

				/*
				 * > 11. If _node_ is a `template` element, then switch the insertion mode to the
				 * >     current template insertion mode and return.
				 */
				case 'TEMPLATE':
					$this->state->insertion_mode = end( $this->state->stack_of_template_insertion_modes );
					return;

				/*
				 * > 12. If _node_ is a `head` element and _last_ is false, then switch the
				 * >     insertion mode to "in head" and return.
				 */
				case 'HEAD':
					if ( ! $last ) {
						$this->state->insertion_mode = WP_HTML_Processor_State::INSERTION_MODE_IN_HEAD;
						return;
					}
					break;

				/*
				 * > 13. If _node_ is a `body` element, then switch the insertion mode to "in body"
				 * >     and return.
				 */
				case 'BODY':
					$this->state->insertion_mode = WP_HTML_Processor_State::INSERTION_MODE_IN_BODY;
					return;

				/*
				 * > 14. If _node_ is a `frameset` element, then switch the insertion mode to
				 * >     "in frameset" and return. (fragment case)
				 */
				case 'FRAMESET':
					$this->state->insertion_mode = WP_HTML_Processor_State::INSERTION_MODE_IN_FRAMESET;
					return;

				/*
				 * > 15. If _node_ is an `html` element, run these substeps:
				 * >     1. If the head element pointer is null, switch the insertion mode to
				 * >        "before head" and return. (fragment case)
				 * >     2. Otherwise, the head element pointer is not null, switch the insertion
				 * >        mode to "after head" and return.
				 */
				case 'HTML':
					$this->state->insertion_mode = isset( $this->state->head_element )
						? WP_HTML_Processor_State::INSERTION_MODE_AFTER_HEAD
						: WP_HTML_Processor_State::INSERTION_MODE_BEFORE_HEAD;
					return;
			}
		}

		/*
		 * > 16. If _last_ is true, then switch the insertion mode to "in body"
		 * >     and return. (fragment case)
		 *
		 * This is only reachable if `$last` is true, as per the fragment parsing case.
		 */
		$this->state->insertion_mode = WP_HTML_Processor_State::INSERTION_MODE_IN_BODY;
	}

	/**
	 * Runs the adoption agency algorithm.
	 *
	 * @since 6.4.0
	 *
	 * @throws WP_HTML_Unsupported_Exception When encountering unsupported HTML input.
	 *
	 * @see https://html.spec.whatwg.org/#adoption-agency-algorithm
	 */
	private function run_adoption_agency_algorithm(): void {
		$budget       = 1000;
		$subject      = $this->get_tag();
		$current_node = $this->state->stack_of_open_elements->current_node();

		if (
			// > If the current node is an HTML element whose tag name is subject
			$current_node && $subject === $current_node->node_name &&
			// > the current node is not in the list of active formatting elements
			! $this->state->active_formatting_elements->contains_node( $current_node )
		) {
			$this->state->stack_of_open_elements->pop();
			return;
		}

		$outer_loop_counter = 0;
		while ( $budget-- > 0 ) {
			if ( $outer_loop_counter++ >= 8 ) {
				return;
			}

			/*
			 * > Let formatting element be the last element in the list of active formatting elements that:
			 * >   - is between the end of the list and the last marker in the list,
			 * >     if any, or the start of the list otherwise,
			 * >   - and has the tag name subject.
			 */
			$formatting_element = null;
			foreach ( $this->state->active_formatting_elements->walk_up() as $item ) {
				if ( 'marker' === $item->node_name ) {
					break;
				}

				if ( $subject === $item->node_name ) {
					$formatting_element = $item;
					break;
				}
			}

			// > If there is no such element, then return and instead act as described in the "any other end tag" entry above.
			if ( null === $formatting_element ) {
				$this->bail( 'Cannot run adoption agency when "any other end tag" is required.' );
			}

			// > If formatting element is not in the stack of open elements, then this is a parse error; remove the element from the list, and return.
			if ( ! $this->state->stack_of_open_elements->contains_node( $formatting_element ) ) {
				$this->state->active_formatting_elements->remove_node( $formatting_element );
				return;
			}

			// > If formatting element is in the stack of open elements, but the element is not in scope, then this is a parse error; return.
			if ( ! $this->state->stack_of_open_elements->has_element_in_scope( $formatting_element->node_name ) ) {
				return;
			}

			/*
			 * > Let furthest block be the topmost node in the stack of open elements that is lower in the stack
			 * > than formatting element, and is an element in the special category. There might not be one.
			 */
			$is_above_formatting_element = true;
			$furthest_block              = null;
			foreach ( $this->state->stack_of_open_elements->walk_down() as $item ) {
				if ( $is_above_formatting_element && $formatting_element->bookmark_name !== $item->bookmark_name ) {
					continue;
				}

				if ( $is_above_formatting_element ) {
					$is_above_formatting_element = false;
					continue;
				}

				if ( self::is_special( $item ) ) {
					$furthest_block = $item;
					break;
				}
			}

			/*
			 * > If there is no furthest block, then the UA must first pop all the nodes from the bottom of the
			 * > stack of open elements, from the current node up to and including formatting element, then
			 * > remove formatting element from the list of active formatting elements, and finally return.
			 */
			if ( null === $furthest_block ) {
				foreach ( $this->state->stack_of_open_elements->walk_up() as $item ) {
					$this->state->stack_of_open_elements->pop();

					if ( $formatting_element->bookmark_name === $item->bookmark_name ) {
						$this->state->active_formatting_elements->remove_node( $formatting_element );
						return;
					}
				}
			}

			$this->bail( 'Cannot extract common ancestor in adoption agency algorithm.' );
		}

		$this->bail( 'Cannot run adoption agency when looping required.' );
	}

	/**
	 * Runs the "close the cell" algorithm.
	 *
	 * > Where the steps above say to close the cell, they mean to run the following algorithm:
	 * >   1. Generate implied end tags.
	 * >   2. If the current node is not now a td element or a th element, then this is a parse error.
	 * >   3. Pop elements from the stack of open elements stack until a td element or a th element has been popped from the stack.
	 * >   4. Clear the list of active formatting elements up to the last marker.
	 * >   5. Switch the insertion mode to "in row".
	 *
	 * @see https://html.spec.whatwg.org/multipage/parsing.html#close-the-cell
	 *
	 * @since 6.7.0
	 */
	private function close_cell(): void {
		$this->generate_implied_end_tags();
		// @todo Parse error if the current node is a "td" or "th" element.
		foreach ( $this->state->stack_of_open_elements->walk_up() as $element ) {
			$this->state->stack_of_open_elements->pop();
			if ( 'TD' === $element->node_name || 'TH' === $element->node_name ) {
				break;
			}
		}
		$this->state->active_formatting_elements->clear_up_to_last_marker();
		$this->state->insertion_mode = WP_HTML_Processor_State::INSERTION_MODE_IN_ROW;
	}

	/**
	 * Inserts an HTML element on the stack of open elements.
	 *
	 * @since 6.4.0
	 *
	 * @see https://html.spec.whatwg.org/#insert-a-foreign-element
	 *
	 * @param WP_HTML_Token $token Name of bookmark pointing to element in original input HTML.
	 */
	private function insert_html_element( WP_HTML_Token $token ): void {
		$this->state->stack_of_open_elements->push( $token );
	}

	/**
	 * Inserts a foreign element on to the stack of open elements.
	 *
	 * @since 6.7.0
	 *
	 * @see https://html.spec.whatwg.org/#insert-a-foreign-element
	 *
	 * @param WP_HTML_Token $token                     Insert this token. The token's namespace and
	 *                                                 insertion point will be updated correctly.
	 * @param bool          $only_add_to_element_stack Whether to skip the "insert an element at the adjusted
	 *                                                 insertion location" algorithm when adding this element.
	 */
	private function insert_foreign_element( WP_HTML_Token $token, bool $only_add_to_element_stack ): void {
		$adjusted_current_node = $this->get_adjusted_current_node();

		$token->namespace = $adjusted_current_node ? $adjusted_current_node->namespace : 'html';

		if ( $this->is_mathml_integration_point() ) {
			$token->integration_node_type = 'math';
		} elseif ( $this->is_html_integration_point() ) {
			$token->integration_node_type = 'html';
		}

		if ( false === $only_add_to_element_stack ) {
			/*
			 * @todo Implement the "appropriate place for inserting a node" and the
			 *       "insert an element at the adjusted insertion location" algorithms.
			 *
			 * These algorithms mostly impacts DOM tree construction and not the HTML API.
			 * Here, there's no DOM node onto which the element will be appended, so the
			 * parser will skip this step.
			 *
			 * @see https://html.spec.whatwg.org/#insert-an-element-at-the-adjusted-insertion-location
			 */
		}

		$this->insert_html_element( $token );
	}

	/**
	 * Inserts a virtual element on the stack of open elements.
	 *
	 * @since 6.7.0
	 *
	 * @param string      $token_name    Name of token to create and insert into the stack of open elements.
	 * @param string|null $bookmark_name Optional. Name to give bookmark for created virtual node.
	 *                                   Defaults to auto-creating a bookmark name.
	 * @return WP_HTML_Token Newly-created virtual token.
	 */
	private function insert_virtual_node( $token_name, $bookmark_name = null ): WP_HTML_Token {
		$here = $this->bookmarks[ $this->state->current_token->bookmark_name ];
		$name = $bookmark_name ?? $this->bookmark_token();

		$this->bookmarks[ $name ] = new WP_HTML_Span( $here->start, 0 );

		$token = new WP_HTML_Token( $name, $token_name, false );
		$this->insert_html_element( $token );
		return $token;
	}

	/*
	 * HTML Specification Helpers
	 */

	/**
	 * Indicates if the current token is a MathML integration point.
	 *
	 * @since 6.7.0
	 *
	 * @see https://html.spec.whatwg.org/#mathml-text-integration-point
	 *
	 * @return bool Whether the current token is a MathML integration point.
	 */
	private function is_mathml_integration_point(): bool {
		$current_token = $this->state->current_token;
		if ( ! isset( $current_token ) ) {
			return false;
		}

		if ( 'math' !== $current_token->namespace || 'M' !== $current_token->node_name[0] ) {
			return false;
		}

		$tag_name = $current_token->node_name;

		return (
			'MI' === $tag_name ||
			'MO' === $tag_name ||
			'MN' === $tag_name ||
			'MS' === $tag_name ||
			'MTEXT' === $tag_name
		);
	}

	/**
	 * Indicates if the current token is an HTML integration point.
	 *
	 * Note that this method must be an instance method with access
	 * to the current token, since it needs to examine the attributes
	 * of the currently-matched tag, if it's in the MathML namespace.
	 * Otherwise it would be required to scan the HTML and ensure that
	 * no other accounting is overlooked.
	 *
	 * @since 6.7.0
	 *
	 * @see https://html.spec.whatwg.org/#html-integration-point
	 *
	 * @return bool Whether the current token is an HTML integration point.
	 */
	private function is_html_integration_point(): bool {
		$current_token = $this->state->current_token;
		if ( ! isset( $current_token ) ) {
			return false;
		}

		if ( 'html' === $current_token->namespace ) {
			return false;
		}

		$tag_name = $current_token->node_name;

		if ( 'svg' === $current_token->namespace ) {
			return (
				'DESC' === $tag_name ||
				'FOREIGNOBJECT' === $tag_name ||
				'TITLE' === $tag_name
			);
		}

		if ( 'math' === $current_token->namespace ) {
			if ( 'ANNOTATION-XML' !== $tag_name ) {
				return false;
			}

			$encoding = $this->get_attribute( 'encoding' );

			return (
				is_string( $encoding ) &&
				(
					0 === strcasecmp( $encoding, 'application/xhtml+xml' ) ||
					0 === strcasecmp( $encoding, 'text/html' )
				)
			);
		}

		$this->bail( 'Should not have reached end of HTML Integration Point detection: check HTML API code.' );
		// This unnecessary return prevents tools from inaccurately reporting type errors.
		return false;
	}

	/**
	 * Returns whether an element of a given name is in the HTML special category.
	 *
	 * @since 6.4.0
	 *
	 * @see https://html.spec.whatwg.org/#special
	 *
	 * @param WP_HTML_Token|string $tag_name Node to check, or only its name if in the HTML namespace.
	 * @return bool Whether the element of the given name is in the special category.
	 */
	public static function is_special( $tag_name ): bool {
		if ( is_string( $tag_name ) ) {
			$tag_name = strtoupper( $tag_name );
		} else {
			$tag_name = 'html' === $tag_name->namespace
				? strtoupper( $tag_name->node_name )
				: "{$tag_name->namespace} {$tag_name->node_name}";
		}

		return (
			'ADDRESS' === $tag_name ||
			'APPLET' === $tag_name ||
			'AREA' === $tag_name ||
			'ARTICLE' === $tag_name ||
			'ASIDE' === $tag_name ||
			'BASE' === $tag_name ||
			'BASEFONT' === $tag_name ||
			'BGSOUND' === $tag_name ||
			'BLOCKQUOTE' === $tag_name ||
			'BODY' === $tag_name ||
			'BR' === $tag_name ||
			'BUTTON' === $tag_name ||
			'CAPTION' === $tag_name ||
			'CENTER' === $tag_name ||
			'COL' === $tag_name ||
			'COLGROUP' === $tag_name ||
			'DD' === $tag_name ||
			'DETAILS' === $tag_name ||
			'DIR' === $tag_name ||
			'DIV' === $tag_name ||
			'DL' === $tag_name ||
			'DT' === $tag_name ||
			'EMBED' === $tag_name ||
			'FIELDSET' === $tag_name ||
			'FIGCAPTION' === $tag_name ||
			'FIGURE' === $tag_name ||
			'FOOTER' === $tag_name ||
			'FORM' === $tag_name ||
			'FRAME' === $tag_name ||
			'FRAMESET' === $tag_name ||
			'H1' === $tag_name ||
			'H2' === $tag_name ||
			'H3' === $tag_name ||
			'H4' === $tag_name ||
			'H5' === $tag_name ||
			'H6' === $tag_name ||
			'HEAD' === $tag_name ||
			'HEADER' === $tag_name ||
			'HGROUP' === $tag_name ||
			'HR' === $tag_name ||
			'HTML' === $tag_name ||
			'IFRAME' === $tag_name ||
			'IMG' === $tag_name ||
			'INPUT' === $tag_name ||
			'KEYGEN' === $tag_name ||
			'LI' === $tag_name ||
			'LINK' === $tag_name ||
			'LISTING' === $tag_name ||
			'MAIN' === $tag_name ||
			'MARQUEE' === $tag_name ||
			'MENU' === $tag_name ||
			'META' === $tag_name ||
			'NAV' === $tag_name ||
			'NOEMBED' === $tag_name ||
			'NOFRAMES' === $tag_name ||
			'NOSCRIPT' === $tag_name ||
			'OBJECT' === $tag_name ||
			'OL' === $tag_name ||
			'P' === $tag_name ||
			'PARAM' === $tag_name ||
			'PLAINTEXT' === $tag_name ||
			'PRE' === $tag_name ||
			'SCRIPT' === $tag_name ||
			'SEARCH' === $tag_name ||
			'SECTION' === $tag_name ||
			'SELECT' === $tag_name ||
			'SOURCE' === $tag_name ||
			'STYLE' === $tag_name ||
			'SUMMARY' === $tag_name ||
			'TABLE' === $tag_name ||
			'TBODY' === $tag_name ||
			'TD' === $tag_name ||
			'TEMPLATE' === $tag_name ||
			'TEXTAREA' === $tag_name ||
			'TFOOT' === $tag_name ||
			'TH' === $tag_name ||
			'THEAD' === $tag_name ||
			'TITLE' === $tag_name ||
			'TR' === $tag_name ||
			'TRACK' === $tag_name ||
			'UL' === $tag_name ||
			'WBR' === $tag_name ||
			'XMP' === $tag_name ||

			// MathML.
			'math MI' === $tag_name ||
			'math MO' === $tag_name ||
			'math MN' === $tag_name ||
			'math MS' === $tag_name ||
			'math MTEXT' === $tag_name ||
			'math ANNOTATION-XML' === $tag_name ||

			// SVG.
			'svg DESC' === $tag_name ||
			'svg FOREIGNOBJECT' === $tag_name ||
			'svg TITLE' === $tag_name
		);
	}

	/**
	 * Returns whether a given element is an HTML Void Element
	 *
	 * > area, base, br, col, embed, hr, img, input, link, meta, source, track, wbr
	 *
	 * @since 6.4.0
	 *
	 * @see https://html.spec.whatwg.org/#void-elements
	 *
	 * @param string $tag_name Name of HTML tag to check.
	 * @return bool Whether the given tag is an HTML Void Element.
	 */
	public static function is_void( $tag_name ): bool {
		$tag_name = strtoupper( $tag_name );

		return (
			'AREA' === $tag_name ||
			'BASE' === $tag_name ||
			'BASEFONT' === $tag_name || // Obsolete but still treated as void.
			'BGSOUND' === $tag_name || // Obsolete but still treated as void.
			'BR' === $tag_name ||
			'COL' === $tag_name ||
			'EMBED' === $tag_name ||
			'FRAME' === $tag_name ||
			'HR' === $tag_name ||
			'IMG' === $tag_name ||
			'INPUT' === $tag_name ||
			'KEYGEN' === $tag_name || // Obsolete but still treated as void.
			'LINK' === $tag_name ||
			'META' === $tag_name ||
			'PARAM' === $tag_name || // Obsolete but still treated as void.
			'SOURCE' === $tag_name ||
			'TRACK' === $tag_name ||
			'WBR' === $tag_name
		);
	}

	/**
	 * Gets an encoding from a given string.
	 *
	 * This is an algorithm defined in the WHAT-WG specification.
	 *
	 * Example:
	 *
	 *     'UTF-8' === self::get_encoding( 'utf8' );
	 *     'UTF-8' === self::get_encoding( "  \tUTF-8 " );
	 *     null    === self::get_encoding( 'UTF-7' );
	 *     null    === self::get_encoding( 'utf8; charset=' );
	 *
	 * @see https://encoding.spec.whatwg.org/#concept-encoding-get
	 *
	 * @todo As this parser only supports UTF-8, only the UTF-8
	 *       encodings are detected. Add more as desired, but the
	 *       parser will bail on non-UTF-8 encodings.
	 *
	 * @since 6.7.0
	 *
	 * @param string $label A string which may specify a known encoding.
	 * @return string|null Known encoding if matched, otherwise null.
	 */
	protected static function get_encoding( string $label ): ?string {
		/*
		 * > Remove any leading and trailing ASCII whitespace from label.
		 */
		$label = trim( $label, " \t\f\r\n" );

		/*
		 * > If label is an ASCII case-insensitive match for any of the labels listed in the
		 * > table below, then return the corresponding encoding; otherwise return failure.
		 */
		switch ( strtolower( $label ) ) {
			case 'unicode-1-1-utf-8':
			case 'unicode11utf8':
			case 'unicode20utf8':
			case 'utf-8':
			case 'utf8':
			case 'x-unicode20utf8':
				return 'UTF-8';

			default:
				return null;
		}
	}

	/*
	 * Constants that would pollute the top of the class if they were found there.
	 */

	/**
	 * Indicates that the next HTML token should be parsed and processed.
	 *
	 * @since 6.4.0
	 *
	 * @var string
	 */
	const PROCESS_NEXT_NODE = 'process-next-node';

	/**
	 * Indicates that the current HTML token should be reprocessed in the newly-selected insertion mode.
	 *
	 * @since 6.4.0
	 *
	 * @var string
	 */
	const REPROCESS_CURRENT_NODE = 'reprocess-current-node';

	/**
	 * Indicates that the current HTML token should be processed without advancing the parser.
	 *
	 * @since 6.5.0
	 *
	 * @var string
	 */
	const PROCESS_CURRENT_NODE = 'process-current-node';

	/**
	 * Indicates that the parser encountered unsupported markup and has bailed.
	 *
	 * @since 6.4.0
	 *
	 * @var string
	 */
	const ERROR_UNSUPPORTED = 'unsupported';

	/**
	 * Indicates that the parser encountered more HTML tokens than it
	 * was able to process and has bailed.
	 *
	 * @since 6.4.0
	 *
	 * @var string
	 */
	const ERROR_EXCEEDED_MAX_BOOKMARKS = 'exceeded-max-bookmarks';

	/**
	 * Unlock code that must be passed into the constructor to create this class.
	 *
	 * This class extends the WP_HTML_Tag_Processor, which has a public class
	 * constructor. Therefore, it's not possible to have a private constructor here.
	 *
	 * This unlock code is used to ensure that anyone calling the constructor is
	 * doing so with a full understanding that it's intended to be a private API.
	 *
	 * @access private
	 */
	const CONSTRUCTOR_UNLOCK_CODE = 'Use WP_HTML_Processor::create_fragment() instead of calling the class constructor directly.';
}
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