PerformanceTiming.unloadEventStart
Deprecated: This feature is no longer recommended. Though some browsers might still support it, it may have already been removed from the relevant web standards, may be in the process of being dropped, or may only be kept for compatibility purposes. Avoid using it, and update existing code if possible; see the compatibility table at the bottom of this page to guide your decision. Be aware that this feature may cease to work at any time.
Warning: This interface of this property is deprecated in the Navigation Timing Level 2 specification. Please use the PerformanceNavigationTiming interface instead.
The legacy PerformanceTiming.unloadEventStart read-only property returns an unsigned long long representing the moment, in milliseconds since the UNIX epoch, the unload event has been thrown. If there is no previous document, or if the previous document, or one of the needed redirects, is not of the same origin, the value returned is 0.
Syntax
time = performanceTiming.unloadEventStart;
Specifications
This feature is no longer on track to become a standard, as the Navigation Timing specification has marked it as deprecated. Use the PerformanceNavigationTiming interface instead.
Browser compatibility
| Desktop | Mobile | |||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Chrome | Edge | Firefox | Internet Explorer | Opera | Safari | WebView Android | Chrome Android | Firefox for Android | Opera Android | Safari on IOS | Samsung Internet | |
unloadEventStart |
6 |
12 |
7 |
9 |
15 |
8 |
≤37 |
18 |
7 |
14 |
9 |
1.0 |
See also
- The
PerformanceTiminginterface it belongs to.
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https://developer.mozilla.org/en-US/docs/Web/API/PerformanceTiming/unloadEventStart