Precision Lap Stopwatch Timer

Our Digital Lap Stopwatch measures elapsed duration with sub-millisecond precision using the browser’s `performance.now()` High Resolution Time API. Unlike standard `Date.now()` (which is subject to system clock adjustments and NTP synchronizations), `performance.now()` provides a monotonically increasing timestamp accurate to fractions of a microsecond. The stopwatch renders time at 100 frames per second (every 10 milliseconds), displaying hundredths of a second (00:00.00) without lag, making it suitable for athletic sprint timing, scientific laboratory benchmarks, and industrial assembly line time-and-motion studies.

When you trigger a "Lap Split", the stopwatch captures an immutable snapshot of the total elapsed duration at that exact millisecond. It subtracts the previous lap’s cumulative timestamp to determine the individual lap segment time (Lap Delta), while the primary elapsed timer continues running uninterrupted in the background. Each lap is recorded with: • Lap Number: Sequential index (Lap 1, Lap 2, Lap 3...) • Split Lap Time: Duration of that specific lap segment • Total Overall Time: Cumulative duration elapsed since timer start This dual-tracking capability allows athletic coaches to analyze individual 400m splits during a 1,600m race.

Total elapsed time measures the entire uninterrupted duration from when the stopwatch was first started until the present moment. In contrast, split lap duration measures the incremental time elapsed exclusively between two consecutive lap button presses. For example, during a 3-lap track workout, your overall elapsed times might be 01:15, 02:35, and 04:00, whereas your individual split lap times would be Lap 1 = 01:15, Lap 2 = 01:20 (02:35 - 01:15), and Lap 3 = 01:25 (04:00 - 02:35).