// https://w3c.github.io/navigation-timing/#dom-performancetiming
[Exposed=Window]
interface PerformanceTiming {

    readonly attribute unsigned long long navigationStart;
    readonly attribute unsigned long long unloadEventStart;
    readonly attribute unsigned long long unloadEventEnd;
    readonly attribute unsigned long long redirectStart;
    readonly attribute unsigned long long redirectEnd;
    readonly attribute unsigned long long fetchStart;
    readonly attribute unsigned long long domainLookupStart;
    readonly attribute unsigned long long domainLookupEnd;
    readonly attribute unsigned long long connectStart;
    readonly attribute unsigned long long connectEnd;
    readonly attribute unsigned long long secureConnectionStart;
    readonly attribute unsigned long long requestStart;
    readonly attribute unsigned long long responseStart;
    readonly attribute unsigned long long responseEnd;
    readonly attribute unsigned long long domLoading;
    readonly attribute unsigned long long domInteractive;
    readonly attribute unsigned long long domContentLoadedEventStart;
    readonly attribute unsigned long long domContentLoadedEventEnd;
    readonly attribute unsigned long long domComplete;
    readonly attribute unsigned long long loadEventStart;
    readonly attribute unsigned long long loadEventEnd;
    [Default] object toJSON();

};