Trait DOMImplementationMethods 
Source pub trait DOMImplementationMethods<D>{
    // Required methods
    fn CreateDocumentType(
        &self,
        qualifiedName: DOMString,
        publicId: DOMString,
        systemId: DOMString,
        _can_gc: CanGc,
    ) -> Result<Root<Dom<<D as DomTypes>::DocumentType>>, Error>;
    fn CreateDocument(
        &self,
        namespace: Option<DOMString>,
        qualifiedName: DOMString,
        doctype: Option<&<D as DomTypes>::DocumentType>,
        _can_gc: CanGc,
    ) -> Result<Root<Dom<<D as DomTypes>::XMLDocument>>, Error>;
    fn CreateHTMLDocument(
        &self,
        title: Option<DOMString>,
        _can_gc: CanGc,
    ) -> Root<Dom<<D as DomTypes>::Document>>;
    fn HasFeature(&self) -> bool;
}