#import
// https://html.spec.whatwg.org/multipage/nav-history-apis.html#popstateevent
[Exposed=Window]
interface PopStateEvent : Event {
constructor(DOMString type, optional PopStateEventInit eventInitDict = {});
readonly attribute any state;
[FIXME] readonly attribute boolean hasUAVisualTransition;
};
dictionary PopStateEventInit : EventInit {
any state = null;
// FIXME: boolean hasUAVisualTransition = false;
};