WP_HTML_Processor::run_adoption_agency_algorithm()

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	/*
	 * > Anything else
	 * > Insert an HTML element for a "body" start tag token with no attributes.
	 */
	after_head_anything_else:
	$this->insert_virtual_node( 'BODY' );
	$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 body' insertion mode.
 *
 * This internal function performs the 'in body' insertion mode
 * logic for the generalized WP_HTML_Processor::step() function.
 *
 * @since 6.4.0
 *
 * @throws WP_HTML_Unsupported_Exception When encountering unsupported HTML input.
 *
 * @see https://html.spec.whatwg.org/#parsing-main-inbody
 * @see WP_HTML_Processor::step
 *
 * @return bool Whether an element was found.
 */
private function step_in_body(): 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 ) {
		case '#text':
			/*
			 * > A character token that is U+0000 NULL
			 *
			 * Any successive sequence of NULL bytes is ignored and won't
			 * trigger active format reconstruction. Therefore, if the text
			 * only comprises NULL bytes then the token should be ignored
			 * here, but if there are any other characters in the stream
			 * the active formats should be reconstructed.
			 */
			if ( parent::TEXT_IS_NULL_SEQUENCE === $this->text_node_classification ) {
				// Parse error: ignore the token.
				return $this->step();
			}

			$this->reconstruct_active_formatting_elements();

			/*
			 * 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_html_element( $this->state->current_token );
			return true;

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

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

		/*
		 * > A start tag whose tag name is "html"
		 */
		case '+HTML':
			if ( ! $this->state->stack_of_open_elements->contains( 'TEMPLATE' ) ) {
				/*
				 * > Otherwise, for each attribute on the token, check to see if the attribute
				 * > is already present on the top element of the stack of open elements. If
				 * > it is not, add the attribute and its corresponding value to that element.
				 *
				 * This parser does not currently support this behavior: ignore the token.
				 */
			}

			// Ignore the token.
			return $this->step();

		/*
		 * > 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':

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