Question 1

Does the timer work if I close the tab?

Accepted Answer

No. The countdown runs in your browser and stops when the tab is closed. Use the system clock on your phone or computer for unattended countdowns.

Question 2

Will it play a sound when time is up?

Accepted Answer

Yes. When the countdown reaches zero, the page plays a 3-beep chime using the Web Audio API. You can mute it with the speaker button if you want silence.

Question 3

Can I use keyboard shortcuts?

Accepted Answer

Yes. Press Space to start/pause, R to reset, and F to toggle fullscreen. The shortcuts work everywhere on the page.

Question 4

How accurate is the countdown?

Accepted Answer

The timer is accurate to within ~16 ms because it uses requestAnimationFrame and re-checks Date.now() each frame.