PerformanceMark

Baseline Widely available

This feature is well established and works across many devices and browser versions. It’s been available across browsers since ⁨September 2017⁩.

Note: This feature is available in Web Workers.

PerformanceMark is an interface for PerformanceEntry objects with an entryType of "mark".

Entries of this type are typically created by calling performance.mark() to add a named DOMHighResTimeStamp (the mark) to the browser's performance timeline. To create a performance mark that isn't added to the browser's performance timeline, use the constructor.

Constructor

PerformanceMark(): Creates a new PerformanceMark object that isn't added to the browser's performance timeline.

Instance properties

PerformanceMark.detail: Contains arbitrary metadata about the measure.

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

PerformanceEntry.entryType Read only: Returns "mark".
PerformanceEntry.name Read only: Returns the name given to the mark when it was created via a call to performance.mark().
PerformanceEntry.startTime Read only: Returns the DOMHighResTimeStamp when performance.mark() was called.
PerformanceEntry.duration Read only: Returns 0. (A mark has no duration.)

Instance methods

This interface has no methods.

Example

See the example in Using the User Timing API.

Chrome DevTools uses performance.mark() 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: mark() method page and the Chrome's extensibility API documentation for more information and examples.

Specifications

Specification
User Timing # performancemark

Browser compatibility

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This page was last modified on ⁨Nov 5, 2025⁩ by MDN contributors.

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