although, is it using setInterval(fn, 1000) to count as 1 second? What if it is 1.016 seconds because JavaScript can delay and not invoke the handler until 1.016 seconds later? Then after a while, it can be off... try it with your iPhone's stopwatch and see if after 30 minutes or an hour, whether your clock is off by a few seconds.
Also if you start the time and go off exercise, come back and the computer is in a sleep, then you wake up the computer and if the processor wasn't running, your timer will be totally off?
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although, is it using setInterval(fn, 1000) to count as 1 second? What if it is 1.016 seconds because JavaScript can delay and not invoke the handler until 1.016 seconds later? Then after a while, it can be off... try it with your iPhone's stopwatch and see if after 30 minutes or an hour, whether your clock is off by a few seconds.
Also if you start the time and go off exercise, come back and the computer is in a sleep, then you wake up the computer and if the processor wasn't running, your timer will be totally off?