Please note, this is a STATIC archive of website developer.mozilla.org from November 2016, cach3.com does not collect or store any user information, there is no "phishing" involved.
The PerformanceTiming.loadEventStart read-only property returns an unsigned long long representing the moment, in miliseconds since the UNIX epoch, when the load event was sent for the current document. If this event has not yet been sent, it returns 0.