PerformanceTiming: responseStart 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.responseStart read-only property returns an unsigned long long representing the moment in time (in milliseconds since the UNIX epoch) when the browser received the first byte of the response from the server, cache, or local resource.