Question 1

How accurate is this stopwatch?

Accepted Answer

Extremely accurate. It calculates time differences mathematically using high-resolution performance.now() timestamps rather than relying purely on an uncalibrated setInterval interval, minimizing drift.

Question 2

Does it work in the background?

Accepted Answer

Yes. Due to the timestamp diffing approach, even if the browser throttles background tabs, the time immediately recalculates correctly when you focus the tab again.

⏱️ Stopwatch

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