PerformanceNavigationTiming
Experimental: This is an experimental technology
Check the Browser compatibility table carefully before using this in production.
The PerformanceNavigationTiming
interface provides methods and properties to store and retrieve metrics regarding the browser's document navigation events. For example, this interface can be used to determine how much time it takes to load or unload a document.
Properties
This interface extends the following PerformanceEntry
properties for navigation performance entry types by qualifying and constraining them as follows:
PerformanceEntry.entryType
Read only-
Returns
"navigation"
. PerformanceEntry.name
Read only-
Returns the document's address.
PerformanceEntry.startTime
Read only-
Returns a
DOMHighResTimeStamp
with a value of "0
". PerformanceEntry.duration
Read only-
Returns a
timestamp
that is the difference between thePerformanceNavigationTiming.loadEventEnd
andPerformanceEntry.startTime
properties.
This interface also extends following PerformanceResourceTiming
properties for navigation performance entry types by qualifying and constraining them as follows:
PerformanceResourceTiming.initiatorType
Read only-
Returns
"navigation"
.
The interface also supports the following properties:
-
A
DOMHighResTimeStamp
representing a time value equal to the time immediately before the browser sets the current document readiness of the current document to complete. -
A
DOMHighResTimeStamp
representing the time value equal to the time immediately after the current document's DOMContentLoaded event completes. -
A
DOMHighResTimeStamp
representing the time value equal to the time immediately before the user agent fires the DOMContentLoaded event at the current document. -
A
DOMHighResTimeStamp
representing atimestamp
representing the time value equal to the time immediately before the user agent sets the current document readiness of the current document to interactive. -
A
DOMHighResTimeStamp
representing the time when the load event of the current document is completed. -
A
DOMHighResTimeStamp
representing the time value equal to the time immediately before the load event of the current document is fired. -
A number representing the number of redirects since the last non-redirect navigation under the current browsing context.
If there was no redirect, or if the redirect was from another origin, and that origin does not permit it's timing information to be exposed to the current origin then the value will be 0.
-
A
DOMHighResTimeStamp
representing the time immediately before the user agent starts requesting the resource from the server, or from relevant application caches or from local resources. -
A
DOMHighResTimeStamp
representing the time immediately after the user agent's HTTP parser receives the first byte of the response from relevant application caches, or from local resources or from the server. -
A
string
representing the navigation type. Must be: "navigate
", "reload
", "back_forward
" or "prerender
". -
A
DOMHighResTimeStamp
representing the time value equal to the time immediately after the user agent finishes the unload event of the previous document. -
A
DOMHighResTimeStamp
representing the time value equal to the time immediately before the user agent starts the unload event of the previous document.
Methods
-
Returns a
DOMString
that is the JSON representation of thePerformanceNavigationTiming
object.
Specifications
Specification |
---|
Navigation Timing Level 2 # sec-PerformanceNavigationTiming |
Browser compatibility
BCD tables only load in the browser