Best matchRelated: setIntervalBeginner
Simple Stopwatch
Create repeating updates that keep the interface moving.
Build a simple stopwatch →Pomodoro Timer
Build a pomodoro timer with HTML, CSS, and JavaScript while practicing setInterval and click events.
Beginner20–30 minutesHTML5CSS3JavaScript
You’ll practice
setIntervalClick EventsDOM Selection
01 — What you’ll build
Pomodoro Timer
This project shows you how HTML, CSS, and JavaScript work together in a pomodoro timer. You’ll control time-based behavior with practical start, stop, and reset actions, then practice setInterval, click events, and DOM selection as you build the complete project from scratch.
02 — Included
- Automatic timed updates
- Pomodoro Timer interface
- Responsive HTML and CSS layout
- Complete source code and live demo
03 — You’ll practice
- Create repeating actions with setInterval
- Handle user clicks
- Select HTML elements from the DOM
- Update content on the page
- Control behavior with conditions
- Perform calculations with JavaScript
Recommended knowledge: Basic HTML and CSS, JavaScript functions and callbacks, Browser timers, JavaScript variables and number operations.
Complete project files
Build It from the Source Code
This project uses timed JavaScript updates.
- 1Create 3 files
- 2Copy the code
- 3Run
index.html
Before you run it
- Leave the tab open to see the timed behavior update.
Project structure
pomodoro-timer/
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Pomodoro Timer</title>
<link rel="stylesheet" href="style.css">
</head>
<body>
<div class="container">
<h1 class="title">Pomodoro Timer</h1>
<p class="timer" id="timer">25:00</p>
<div class="button-wrapper">
<button id="start">Start</button>
<button id="stop">Stop</button>
<button id="reset">Reset</button>
</div>
</div>
<script src="index.js"></script>
</body>
</html>
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