Best matchRelated: setTimeoutIntermediate
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Build a dice roll simulator →Heart Trail Animation
Build a heart trail animation with HTML, CSS, and JavaScript while practicing setTimeout and mouse events.
Beginner20–30 minutesHTML5CSS3JavaScript
You’ll practice
setTimeoutMouse EventsDOM Selection
01 — What you’ll build
Heart Trail Animation
Build a heart trail animation using HTML, CSS, and JavaScript, then connect the interface to the logic that makes it work. You’ll learn how to connect user interactions to visible changes on the page while getting hands-on practice with setTimeout, mouse events, and DOM selection.
02 — Included
- Randomized results
- Heart Trail Animation interface
- Responsive HTML and CSS layout
- Complete source code and live demo
03 — You’ll practice
- Delay actions with setTimeout
- Track mouse events
- Select HTML elements from the DOM
- Create and add elements dynamically
- Generate random values
- Perform calculations with JavaScript
Recommended knowledge: Basic HTML and CSS, JavaScript functions and callbacks, Browser timers, Functions and Math.random.
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.
- Keep an internet connection available for external assets.
Project structure
heart-trail-animation/
<!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>Heart Trail Animation</title>
<link rel="stylesheet" href="style.css" />
</head>
<body>
<script src="index.js"></script>
</body>
</html>
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