public function removeClass($class)
    {
        if (isset($this->attr['class'])) {
            $classes = explode(' ', $this->attr['class']);
            if (in_array($class, $classes)) {
                $classes = array_diff($classes, [$class]);
            }

            if (empty($classes)) {
                unset($this->attr['class']);
            } else {
                $this->attr['class'] = implode(' ', $classes);
            }
        }
    }