PerformanceEntry

The read-only duration property returns a timestamp that is the duration of the performance entry. The meaning of this property depends on the value of this entry's entryType.

The read-only entryType property returns a string representing the type of performance metric that this entry represents.

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.

The read-only startTime property returns the first timestamp recorded for this PerformanceEntry. The meaning of this property depends on the value of this entry's entryType.

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