interface PerformanceResourceTiming : PerformanceEntry {
    readonly attribute DOMString initiatorType;
    readonly attribute DOMHighResTimeStamp workerStart;
    readonly attribute DOMHighResTimeStamp redirectStart;
    readonly attribute DOMHighResTimeStamp redirectEnd;
    readonly attribute DOMHighResTimeStamp fetchStart;
    readonly attribute DOMHighResTimeStamp domainLookupStart;
    readonly attribute DOMHighResTimeStamp domainLookupEnd;
    readonly attribute DOMHighResTimeStamp connectStart;
    readonly attribute DOMHighResTimeStamp connectEnd;
    readonly attribute DOMHighResTimeStamp secureConnectionStart;
    readonly attribute DOMHighResTimeStamp requestStart;
    readonly attribute DOMHighResTimeStamp responseStart;
    readonly attribute DOMHighResTimeStamp responseEnd;
    [MeasureAs=PerformanceResourceTimingSizes] readonly attribute unsigned long long transferSize;
    [MeasureAs=PerformanceResourceTimingSizes] readonly attribute unsigned long long encodedBodySize;
    [MeasureAs=PerformanceResourceTimingSizes] readonly attribute unsigned long long decodedBodySize;
};
interface PerformanceEntry {};

enum NavigationType {
    "navigate",
    "reload",
    "back_forward",
    "prerender"
};

interface PerformanceNavigationTiming : PerformanceResourceTiming {
    readonly attribute DOMHighResTimeStamp unloadEventStart;
    readonly attribute DOMHighResTimeStamp unloadEventEnd;
    readonly attribute DOMHighResTimeStamp domInteractive;
    readonly attribute DOMHighResTimeStamp domContentLoadedEventStart;
    readonly attribute DOMHighResTimeStamp domContentLoadedEventEnd;
    readonly attribute DOMHighResTimeStamp domComplete;
    readonly attribute DOMHighResTimeStamp loadEventStart;
    readonly attribute DOMHighResTimeStamp loadEventEnd;
    readonly attribute NavigationType      type;
    readonly attribute unsigned short      redirectCount;
    [Default] object toJSON();
};