For a scientific project, I need to track reaction times: how long does it take for someone to push a button? I need this to be accurate to the milisecond (or very close).
And is there any known accuracy cutoff? (An article linked to below suggests 15ms.)
And is there any variation by browser and/or method for tracking the time?
To repeat: I'm interested in time elapsed between two events. I don't care at all what time it is.
I've done a bit of searching and have come across some information, but it's not entirely clear: