Definition
Event Timing API defines PerformanceEventTiming
[Exposed=Window]
interface PerformanceEventTiming : PerformanceEntry {
readonly attribute DOMHighResTimeStamp processingStart;
readonly attribute DOMHighResTimeStamp processingEnd;
readonly attribute boolean cancelable;
readonly attribute Node? target;
readonly attribute unsigned long long interactionId;
[Default] object toJSON();
};