Performance
User Timing API
Create custom application performance benchmarks using performance.mark and measure.
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Web API Execution Output
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Native JavaScript Code Example (Zero Libraries)
performance.mark('startTask');
performance.mark('endTask');
performance.measure('taskDuration', 'startTask', 'endTask');About the User Timing API Web API
User Timing API lets developers mark timestamps and measure durations.
Specification:W3C & WHATWG Web API Standard
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