+ Though `workerStart` is exposed in PerformanceResourceTiming, it + has a different meaning in Navigation Timing, as unlike subresources, a navigation may + trigger the activation or running of a service worker. + In the context of Navigation Timing, `workerStart` returns the timestamp measured + just before the worker has been activated or started. See [[service-workers]] for + a precise definition. +
+ When a [=service worker=] is used as part of the navigation, The `fetchStart` overload
+ holds a different meaning than the meaning in
+
+ PerformanceResourceTiming.
+ It returns the timestamp measured right before the {{FetchEvent}} is dispatched for
+ the [=service worker=]. The time difference between `workerStart` and `fetchStart` in
+ the document's navigation timing entry can be used to determine roughly how long it
+ took for the worker to be initialized or activated. See [[service-workers]] for
+ a precise definition.
+
@@ -379,57 +399,82 @@
A {{PerformanceNavigationTiming}} has an associated null or [=service worker timing info=] service worker timing. -
+The unloadEventStart getter steps are to return |this|'s - [=previous document unload timing=]'s [=document unload timing info/unload event start time=]. - -
See unload event for more info.
- + [=previous document unload timing=]'s [=document unload timing info/unload event start + time=]. +If the previous document and the current document have the same + origin, this timestamp is measured immediately + before the user agent starts the unload event + of the previous document. If there is no previous document or the + previous document has a different origin than the current document, this attribute will return + zero. +
The unloadEventEnd getter steps are to return |this|'s - [=previous document unload timing=]'s [=document unload timing info/unload event end time=]. -
See unload event for more info.
- + [=previous document unload timing=]'s + [=document unload timing info/unload event end time=]. +If the previous document and the current document have the same + origin, this timestamp is measured immediately + after the user agent handles the unload event + of the previous document. If there is no previous document or the + previous document has a different origin than the current document, this attribute will return + zero. +
The domInteractive getter steps are to return |this|'s [=document load timing=]'s [=document load timing info/DOM interactive time=].
-See document readiness for more info. +
This timestamp is measured before the user agent sets the + current document readiness to + "interactive".
The domContentLoadedEventStart getter steps are to return |this|'s [=document load timing=]'s [=document load timing info/DOM content loaded event start time=].
-See DOMContentLoaded for more info. +
+This timestamp is measured before the user agent dispatches the + DOMContentLoaded + event.
The domContentLoadedEventEnd getter steps are to return |this|'s [=document load timing=]'s [=document load timing info/DOM content loaded event end time=].
-See DOMContentLoaded - event completes. +
This timestamp is measured after the user agent completes handling of the + DOMContentLoaded + event.
The domComplete getter steps are to return |this|'s [=document load timing=]'s [=document load timing info/DOM complete time=]. -
See document readiness for more info. +
This timestamp is measured before the user agent sets the + current document readiness to + "complete". See document readiness for a precise + definition.
The loadEventStart getter steps are to return |this|'s [=document load timing=]'s [=document load timing info/load event start time=].
+This timestamp is measured before the user agent dispatches the + load event for the document. +
The loadEventEnd getter steps are to return |this|'s [=document load timing=]'s [=document load timing info/load event end time=].
+This timestamp is measured after the user agent completes handling the + load event for the document. +
The type getter steps are to run the |this|'s [=navigation type=].