The microseconds since navigation started
Date.now will give you milliseconds since the epoch, but maybe what you really want is the time since the page started loading.
> performance.now() 162374.73599999974
Essentially that is the microseconds since the page started loading, but really its the microseconds since
performance.timing.navigationStart which itself is defined as the:
time immediately after the user agent finishes prompting to unload
which is defined here.Tweet