protected function _part($part, $content = null, $options = []) {
        $options += [
            'templateVars' => []
        ];
        $out = $this->_cleanCurrent();
        $out .= $this->formatTemplate($part.'Start', [
            'attrs' => $this->templater()->formatAttributes($options, ['close']),
            'templateVars' => $options
        ]);
        $this->_current = $part;
        if ($content) {
            $out .= $content;
            $out .= $this->_cleanCurrent();
        }
        return $out;
    }