Beginner•Web Development

Beginner Quiz App

Build a fully interactive quiz application using only HTML, CSS, and vanilla JavaScript. Features a countdown timer, instant answer feedback, progress tracking, a circular score display, and Web Audio API sound effects — no frameworks, no backend required.

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What You Will Build

A sleek, responsive quiz app with a modern blue/white card UI. It displays one question at a time with 4 options, a 15-second countdown timer (with an animated SVG ring), instant correct/wrong feedback with answer highlighting, a progress bar, and a result screen with an animated circular score display and correct/wrong/skipped stats. Users can also navigate questions via keyboard and hear sound effects powered by the Web Audio API.

Concepts You'll Learn

Structuring a multi-screen UI with semantic HTML and CSS animations
Storing quiz questions as a JavaScript array of objects
Tracking application state — score, current question, answered flag
Rendering dynamic content to the DOM using createElement and textContent
Implementing a countdown timer with setInterval and clearInterval
Drawing animated SVG rings to visualise timer and score progress
Providing instant feedback by toggling CSS classes on option buttons
Preventing invalid interactions — blocking re-selection and early navigation
Generating sound effects with the Web Audio API (no audio files needed)
Building a result screen with percentage-based emoji ratings
Keyboard event handling with keydown listeners (1–4 to select, Enter to advance)
Responsive design with Flexbox, CSS Grid, and media queries for mobile support
CSS custom properties for a consistent design token system
Smooth micro-animations using CSS keyframes and transitions