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Countdown Timer

Medium
javascript

Build a countdown timer that counts down from a set number of seconds (e.g. 60) and displays it as MM:SS, stopping exactly at 00:00.

Check your work against

  • Displays time in MM:SS format
  • Counts down automatically once per second after the page loads
  • Stops exactly at 00:00 — never goes negative

There's no automated grading for UI challenges — self-check against this list, then compare with the solution preview.

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