public function is_auto_width()
    {
        $style = $this->_style;

        return in_array(
            "auto",
            array(
                $style->width,
                $style->margin_left,
                $style->margin_right,
                $style->border_left_width,
                $style->border_right_width,
                $style->padding_left,
                $style->padding_right,
                $this->_containing_block["w"]
            ),
            true
        );
    }