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PerformanceMark - Web APIs | MDN

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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.

PerformanceMark()

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

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.)

This interface also supports the following properties:

PerformanceMark.detail Read only

Returns arbitrary metadata that has been included in the mark upon construction.

This interface has no methods.

See the example in Using the User Timing API.

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