WP_HTML_Processor::next_token(): bool

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		false
	);
	$fragment_processor->state->stack_of_open_elements->push( $root_node );

	$fragment_processor->bookmarks['context-node']   = new WP_HTML_Span( 0, 0 );
	$fragment_processor->context_node                = clone $this->current_element->token;
	$fragment_processor->context_node->bookmark_name = 'context-node';
	$fragment_processor->context_node->on_destroy    = null;

	$fragment_processor->breadcrumbs = array( 'HTML', $fragment_processor->context_node->node_name );

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

	$fragment_processor->reset_insertion_mode_appropriately();

	/*
	 * > Set the parser's form element pointer to the nearest node to the context element that
	 * > is a form element (going straight up the ancestor chain, and including the element
	 * > itself, if it is a form element), if any. (If there is no such form element, the
	 * > form element pointer keeps its initial value, null.)
	 */
	foreach ( $this->state->stack_of_open_elements->walk_up() as $element ) {
		if ( 'FORM' === $element->node_name && 'html' === $element->namespace ) {
			$fragment_processor->state->form_element                = clone $element;
			$fragment_processor->state->form_element->bookmark_name = null;
			$fragment_processor->state->form_element->on_destroy    = null;
			break;
		}
	}

	$fragment_processor->state->encoding_confidence = 'irrelevant';

	/*
	 * Update the parsing namespace near the end of the process.
	 * This is important so that any push/pop from the stack of open
	 * elements does not change the parsing namespace.
	 */
	$fragment_processor->change_parsing_namespace(
		$this->current_element->token->integration_node_type ? 'html' : $namespace
	);

	return $fragment_processor;
}

/**
 * Stops the parser and terminates its execution when encountering unsupported markup.
 *
 * @throws WP_HTML_Unsupported_Exception Halts execution of the parser.

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