pub trait StylePropertyMapReadOnlyMethods<D>where
    D: DomTypes,{
    // Required methods
    fn Get(
        &self,
        property: DOMString,
    ) -> Option<Root<Dom<<D as DomTypes>::CSSStyleValue>>>;
    fn Has(&self, property: DOMString) -> bool;
    fn GetProperties(&self) -> Vec<DOMString>;
}