PerformanceEntry extension type

The PerformanceEntry object encapsulates a single performance metric that is part of the browser's performance timeline.

The Performance API offers built-in metrics which are specialized subclasses of PerformanceEntry. This includes entries for resource loading, event timing, (FID), and more.

A performance entry can also be created by calling the Performance.mark or Performance.measure methods at an explicit point in an application. This allows you to add your own metrics to the performance timeline.

The PerformanceEntry instances will always be one of the following subclasses:

• LargestContentfulPaint
• LayoutShift
• PerformanceEventTiming
• PerformanceLongTaskTiming
• PerformanceMark
• PerformanceMeasure
• PerformanceNavigationTiming
• PerformancePaintTiming
• PerformanceResourceTiming
• PerformanceServerTiming
• TaskAttributionTiming
• VisibilityStateEntry

on

• JSObject

Implemented types

• JSObject

Implementers

• PerformanceMark
• PerformanceMeasure
• PerformancePaintTiming
• PerformanceResourceTiming
• VisibilityStateEntry

Properties

duration → DOMHighResTimeStamp

no setter

entryType → String

no setter

hashCode → int

The hash code for this object.

no setter, inherited

id → int

no setter

name → String

no setter

navigationId → int

no setter

runtimeType → Type

A representation of the runtime type of the object.

no setter, inherited

startTime → DOMHighResTimeStamp

no setter

Methods

noSuchMethod(Invocation invocation) → dynamic

Invoked when a nonexistent method or property is accessed.

inherited

toJSON() → JSObject

The toJSON() method is a ; it returns a JSON representation of the PerformanceEntry object.

toString() → String

A string representation of this object.

inherited

Operators

operator ==(Object other) → bool

The equality operator.

inherited