public function setStyleAttributeValue($attr_key, $attr_value): void
    {

        $style_array = $this->getStyleAttributeArray();
        $style_array[$attr_key] = $attr_value;

        $style_string = '';
        foreach ($style_array as $key => $value) {
            $style_string .= $key . ':' . $value . ';';
        }

        $this->setAttribute('style', $style_string);
    }