// https://dom.spec.whatwg.org/#interface-namednodemap
[Exposed=Window, LegacyUnenumerableNamedProperties]
interface NamedNodeMap {
    readonly attribute unsigned long length;

    getter Attr? item(unsigned long index);
    getter Attr? getNamedItem([Utf16FlyString] Utf16DOMString qualifiedName);
    Attr? getNamedItemNS([Utf16FlyString] Utf16DOMString? namespace, [Utf16FlyString] Utf16DOMString localName);

    [CEReactions] Attr? setNamedItem(Attr attr);
    [CEReactions] Attr? setNamedItemNS(Attr attr);
    [CEReactions] Attr removeNamedItem([Utf16FlyString] Utf16DOMString qualifiedName);
    [CEReactions] Attr removeNamedItemNS([Utf16FlyString] Utf16DOMString? namespace, [Utf16FlyString] Utf16DOMString localName);
};