Interface PerformanceMark
interface PerformanceMark {
detail: any;
duration: number;
entryType: string;
name: string;
startTime: number;
toJSON(): any;
}
detail: any;
duration: number;
entryType: string;
name: string;
startTime: number;
toJSON(): any;
}
                 
                    
                  Hierarchy
              
              - PerformanceEntry- PerformanceMark (View Summary)
 
 Properties
Readonlydetail
detail: any
Readonlyduration
duration: number
ReadonlyentryType 
entryType: string
Readonlyname
name: string
ReadonlystartTime 
startTime: number
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 browser's performance timeline.
MDN Reference