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Countdown timer app project template from

Project Details

Write an app that counts down to 0 from a time (say, five minutes).


  • How frequently should you update the UI as you countdown?
  • How do you format the time?
  • What happens when the timer hits 0?

Need help?

This project is part of the Vanilla JS Academy.

<!DOCTYPE html>
<title>Project Template</title>
<style type="text/css">
body {
margin-left: auto;
margin-right: auto;
max-width: 40em;
width: 88%;
<h1>Countdown Timer</h1>
<div id="app"></div>
// Project code...
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