JS Built-ins
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performanceadvanced

performance — mark() returns a PerformanceMark

📖 Usage Example
performance.clearMarks()
performance.clearMeasures()

clearMarks() and clearMeasures() remove stored timing entries from the buffer.

performance.mark()

performance.mark(name) creates a named timestamp entry and returns a PerformanceMark object.

Challenge: Verify that performance.mark('test-mark-3') is an instanceof PerformanceMark.

💡 Hints (1)
  • • performance.mark() was updated to return the created PerformanceMark in modern browsers