PerformanceTiming: fetchStart property

Deprecated

Avoid using this feature in new projects. This feature is supserseded by the PerformanceNavigationTiming API. This feature may be a candidate for removal from web standards or browsers.

Consider using the following features instead: Performance or Navigation timing.

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Warning: This interface of this property is deprecated in the Navigation Timing Level 2 specification. Please use the PerformanceNavigationTiming interface instead.

The legacy 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. This moment is before the check to any application cache.