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

The legacy PerformanceTiming.navigationStart read-only property returns an unsigned long long representing the moment, in milliseconds since the UNIX epoch, right after the prompt for unload terminates on the previous document in the same browsing context. If there is no previous document, this value will be the same as PerformanceTiming.fetchStart.


time = performanceTiming.navigationStart;


Specification Status Comment
Navigation Timing
The definition of 'PerformanceTiming.navigationStart' in that specification.
Recommendation Initial definition.

Browser compatibility

BCD tables only load in the browser

See also