#import 
#import 
// https://w3c.github.io/media-source/#dom-bufferedchangeevent
[Exposed=(Window,DedicatedWorker)]
interface BufferedChangeEvent : Event {
    constructor(DOMString type, optional BufferedChangeEventInit eventInitDict = {});
    [FIXME,SameObject] readonly attribute TimeRanges addedRanges;
    [FIXME,SameObject] readonly attribute TimeRanges removedRanges;
};
// https://w3c.github.io/media-source/#dom-bufferedchangeeventinit
dictionary BufferedChangeEventInit : EventInit {
    TimeRanges addedRanges;
    TimeRanges removedRanges;
};