variable PerformanceMark
PerformanceMark is an abstract interface for PerformanceEntry objects
with an entryType of "mark". Entries of this type are created by calling
performance.mark() to add a named DOMHighResTimeStamp (the mark) to the
performance timeline.
type
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{ readonly prototype: PerformanceMark; new (name: string, options?: PerformanceMarkOptions): PerformanceMark; }