No background timing: If you close or reload this tab, all lap data and the running timer are permanently lost. There is no session persistence.
Display precision is centiseconds (1/100 s), not milliseconds (1/1000 s) — the internal clock is accurate to the millisecond, but we display only 2 decimal places. Sub-centisecond differences are not shown.
Copy to clipboard requires HTTPS and browser permission. On HTTP or if permission is denied, Copy will show an error. Use .txt or .csv export instead.
Laps cannot be rearranged or edited after they are recorded. To correct a mistake, use Clear Laps.
No countdown or target time. This is a forward-only stopwatch.