interface PerformanceTiming {

    readonly attribute unsigned long navigationStart;
    readonly attribute unsigned long unloadEventStart;
    readonly attribute unsigned long unloadEventEnd;
    readonly attribute unsigned long redirectStart;
    readonly attribute unsigned long redirectEnd;
    readonly attribute unsigned long fetchStart;
    readonly attribute unsigned long domainLookupStart;
    readonly attribute unsigned long domainLookupEnd;
    readonly attribute unsigned long connectStart;
    readonly attribute unsigned long connectEnd;
    readonly attribute unsigned long secureConnectionStart;
    readonly attribute unsigned long requestStart;
    readonly attribute unsigned long responseStart;
    readonly attribute unsigned long responseEnd;
    readonly attribute unsigned long domLoading;
    readonly attribute unsigned long domInteractive;
    readonly attribute unsigned long domContentLoadedEventStart;
    readonly attribute unsigned long domContentLoadedEventEnd;
    readonly attribute unsigned long domComplete;
    readonly attribute unsigned long loadEventStart;
    readonly attribute unsigned long loadEventEnd;

};