pub trait CSSRuleMethods<D>where
    D: DomTypes,{
    // Required methods
    fn Type(&self) -> u16;
    fn CssText(&self) -> DOMString;
    fn SetCssText(&self, value: DOMString);
    fn GetParentStyleSheet(
        &self,
    ) -> Option<Root<Dom<<D as DomTypes>::CSSStyleSheet>>>;
}