// https://xhr.spec.whatwg.org/#interface-progressevent
[Exposed=(Window,Worker)]
interface ProgressEvent : Event {
    constructor(DOMString type, optional ProgressEventInit eventInitDict = {});

    readonly attribute boolean lengthComputable;
    readonly attribute double loaded;
    readonly attribute double total;
};

dictionary ProgressEventInit : EventInit {
    boolean lengthComputable = false;
    double loaded = 0;
    double total = 0;
};
