Learn Frontend by
Building What You See
Master fundamental HTML, CSS, and JavaScript skills through hands-on UI exercises with live preview, automated verification tests, progressive hints, and zero setup required.
Three Comprehensive Learning Tracks
Curated progression from essential tags to production-level interactive UI components.
HTML Fundamentals
Headings, Paragraphs, Links, Images, Lists, Form Controls, Tables, Semantic Layouts, and Checkout Forms.
CSS Styling & Layouts
Colors, Typography, Spacing, Borders, Flexbox row/column, CSS Grid, Responsive Design, and Login Card UI.
JavaScript DOM & Logic
Events, DOM Manipulation, Counters, Realtime Character Counts, Form Validation, Todo App, Tabs, and Modals.
Designed for Rapid Skill Building
Built-in features designed to give immediate feedback without fluff.
Live Sandboxed Preview
Instant visual feedback with debounce protection and isolated iframe execution.
Automated Test Runner
Deterministic declarative testing that verifies HTML tags, CSS styles, and JavaScript DOM behaviors.
Progressive 3-Tier Hints
Unlock hints step-by-step only when you are stuck, preserving the joy of problem solving.
100% Client-Side & Private
Progress and custom solutions are saved seamlessly in local storage with zero server latency.