PerformanceMeasure

PerformanceMeasure is an abstract interface for PerformanceEntry objects with an entryType of "measure". Entries of this type are created by calling performance.measure() to add a named DOMHighResTimeStamp (the measure) between two marks to the browser's performance timeline.

Instance properties

PerformanceMeasure.detail

Contains arbitrary metadata about the measure.

This interface extends the following PerformanceEntry properties by qualifying/constraining the properties as follows:

PerformanceEntry.entryType

Returns "measure".

PerformanceEntry.name

Returns the name given to the measure when it was created via a call to performance.measure().

PerformanceEntry.startTime

Returns a timestamp given to the measure when performance.measure() was called.

PerformanceEntry.duration

Returns a DOMHighResTimeStamp that is the duration of the measure (typically, the measure's end mark timestamp minus its start mark timestamp).

Instance methods

This interface has no methods.

Example

See the example in Using the User Timing API.

Chrome DevTools uses performance.measure() and in particular a structured detail property as part of its extensibility API that surfaces these in custom tracks in performance traces. See the example in Performance: measure() method page and the Chrome's extensibility API documentation for more information and examples.

Specifications

• User Timing

See also

• User Timing (Overview)
• Using the User Timing API