.loadEventEnd read-only property returns an
unsigned long long representing the moment, in miliseconds since the UNIX epoch, when the
load event handler terminated, that is when the load event is completed. If this event has not yet been sent, or is not yet completed, it returns
time = performanceTiming.loadEventEnd;
The definition of 'PerformanceTiming.loadEventEnd' in that specification.
PerformanceTiminginterface it belongs to.