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What does the method Performance.now() return?

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What does the method Performance.now() return?

(a) DOMTimeStamp

(b) DOMHighResTimeStamp

(c) DOM\Stamp

(d) TimeStamp

I got this question in an online quiz.

The origin of the question is Invocation of the Performance Object topic in chapter Invocation and Performance Navigation of JavaScript

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The correct choice is (b) DOMHighResTimeStamp

The best I can explain: The Performance.now() method returns a DOMHighResTimeStamp, measured in milliseconds, accurate to one thousandth of a millisecond equal to the number of milliseconds since the PerformanceTiming.navigationStart property and the call to the method. The returned value represents the time elapsed since the time origin.

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