Count down to zero with an alert

How it works

The selected duration becomes milliseconds, performance.now measures each running segment, and pause banks the remainder. Animation frames redraw target minus elapsed time; completion schedules three Web Audio beeps after a user gesture has enabled audio.

• Five minutes is the initial convenience preset beside 1, 10, and 25 minutes, not a task recommendation.
• Seconds stay within 0–59 while minutes can extend the total to three hours.

Worked example

											Minutes: 1
Seconds: 30
Action: Start
										

												1:30 → 0:00
Time is up
											

When to use this

Kitchen prep uses short reminders, study exercises use fixed intervals, and meetings time individual agenda items.

Edge cases

• Paused time does not disappear because restart subtracts only a new running segment.
• Background throttling can delay visible updates or the beep even though elapsed time remains timestamp-based.
• Muted audio, power saving, or a closed tab can suppress the alert, so this is not a safety-critical alarm.

References