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What does the method Performance now() return

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Invocation and Performance Navigation
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What does the method Performance.now() return?

Answer & Solution
Correct Answer: Option B
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.
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