PerformanceTiming: responseStart property

{{APIRef("Performance API")}}{{Deprecated_Header}}

[!WARNING] This interface of this property is deprecated in the Navigation Timing Level 2 specification. Please use the {{domxref("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.

Value

An unsigned long long.

Specifications

{{Specifications}}

Browser compatibility

{{Compat}}

See also

• The {{domxref("PerformanceTiming")}} interface it belongs to.