Building a Countdown Timer Web App with Vanilla HTML, CSS, and JavaScript.

Learn how to build a functional Countdown Timer web application using only HTML, CSS, and JavaScript. This hands-on guide uses a clear Q&A format to walk you through every step of the process, from setting up the project to writing the countdown logic.

What's inside:

• Structured sections on layout, styling, and interactivity

• Real code snippets with practical explanations

• Input validation, responsive layout, and user-friendly design

• Debugging techniques and ideas to expand your project

Whether you're brushing up on core skills or creating your first interactive app, this guide helps you apply essential web development concepts through a focused, real-world project.