PerformanceResourceTiming extension type

The PerformanceResourceTiming interface enables retrieval and analysis of detailed network timing data regarding the loading of an application's resources. An application can use the timing metrics to determine, for example, the length of time it takes to fetch a specific resource, such as an XMLHttpRequest, , image, or script.

API documentation sourced from MDN Web Docs.

on
Implemented types
Available extensions

Properties

connectEnd → double
The connectEnd read-only property returns the DOMHighResTimeStamp immediately after the browser finishes establishing the connection to the server to retrieve the resource. The timestamp value includes the time interval to establish the transport connection, as well as other time intervals such as TLS handshake and SOCKS authentication.
no setter
connectStart → double
The connectStart read-only property returns the DOMHighResTimeStamp immediately before the user agent starts establishing the connection to the server to retrieve the resource.
no setter
decodedBodySize → int
The decodedBodySize read-only property returns the size (in octets) received from the fetch (HTTP or cache) of the message body after removing any applied content encoding (like gzip or Brotli). If the resource is retrieved from an application cache or local resources, it returns the size of the payload after removing any applied content encoding.
no setter
domainLookupEnd → double
The domainLookupEnd read-only property returns the DOMHighResTimeStamp immediately after the browser finishes the domain-name lookup for the resource.
no setter
domainLookupStart → double
The domainLookupStart read-only property returns the DOMHighResTimeStamp immediately before the browser starts the domain name lookup for the resource.
no setter
duration → double
The read-only duration property returns a that is the duration of the . The meaning of this property depends on the value of this entry's PerformanceEntry.entryType.
no setterinherited
encodedBodySize → int
The encodedBodySize read-only property represents the size (in octets) received from the fetch (HTTP or cache) of the payload body before removing any applied content encodings (like gzip or Brotli). If the resource is retrieved from an application cache or a local resource, it must return the size of the payload body before removing any applied content encoding.
no setter
entryType → String
The read-only entryType property returns a string representing the type of performance metric that this entry represents.
no setterinherited
fetchStart → double
The fetchStart read-only property represents a DOMHighResTimeStamp immediately before the browser starts to fetch the resource.
no setter
hashCode → int
The hash code for this object.
no setterinherited
initiatorType → String
The initiatorType read-only property is a string representing web platform feature that initiated the resource load.
no setter
name → String
The read-only name property of the PerformanceEntry interface is a string representing the name for a performance entry. It acts as an identifier, but it does not have to be unique. The value depends on the subclass.
no setterinherited
nextHopProtocol → String
The nextHopProtocol read-only property is a string representing the network protocol used to fetch the resource, as identified by the ALPN Protocol ID (RFC7301).
no setter
redirectEnd → double
The redirectEnd read-only property returns a DOMHighResTimeStamp immediately after receiving the last byte of the response of the last redirect.
no setter
redirectStart → double
The redirectStart read-only property returns a DOMHighResTimeStamp representing the start time of the fetch which that initiates the redirect.
no setter
renderBlockingStatus → RenderBlockingStatusType
The renderBlockingStatus read-only property returns the render-blocking status of the resource.
no setter
requestStart → double
The requestStart read-only property returns a DOMHighResTimeStamp of the time immediately before the browser starts requesting the resource from the server, cache, or local resource. If the transport connection fails and the browser retires the request, the value returned will be the start of the retry request.
no setter
responseEnd → double
The responseEnd read-only property returns a DOMHighResTimeStamp immediately after the browser receives the last byte of the resource or immediately before the transport connection is closed, whichever comes first.
no setter
responseStart → double
The responseStart read-only property returns a DOMHighResTimeStamp immediately after the browser receives the first byte of the response from the server, cache, or local resource.
no setter
runtimeType → Type
A representation of the runtime type of the object.
no setterinherited
secureConnectionStart → double
The secureConnectionStart read-only property returns a DOMHighResTimeStamp immediately before the browser starts the handshake process to secure the current connection. If a secure connection is not used, the property returns zero.
no setter
serverTiming → JSArray<PerformanceServerTiming>
The serverTiming read-only property returns an array of PerformanceServerTiming entries containing server timing metrics.
no setter
startTime → double
The read-only startTime property returns the first recorded for this . The meaning of this property depends on the value of this entry's PerformanceEntry.entryType.
no setterinherited
transferSize → int
The transferSize read-only property represents the size (in octets) of the fetched resource. The size includes the response header fields plus the response payload body (as defined by RFC7230).
no setter
workerStart → double
The workerStart read-only property of the PerformanceResourceTiming interface returns a DOMHighResTimeStamp immediately before dispatching the FetchEvent if a Service Worker thread is already running, or immediately before starting the Service Worker thread if it is not already running. If the resource is not intercepted by a Service Worker the property will always return 0.
no setter

Methods

noSuchMethod(Invocation invocation) → dynamic
Invoked when a nonexistent method or property is accessed.
inherited
toJSON() → JSObject
The toJSON() method of the PerformanceResourceTiming interface is a ; it returns a JSON representation of the PerformanceResourceTiming object.
override
toString() → String
A string representation of this object.
inherited

Operators

operator ==(Object other) → bool
The equality operator.
inherited