What is the purpose of the property PerformanceTiming.fetchStart?

What is the purpose of the property PerformanceTiming.fetchStart? Correct Answer Browser ready to fetch document

The PerformanceTiming.fetchStart read-only property returns an unsigned long long representing the moment, in milliseconds since the UNIX epoch, the browser is ready to fetch the document using an HTTP request. If there is no previous document, this value will be the same as PerformanceTiming.fetchStart.
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