Online HTML CSS JavaScript Editor - Interactive Web Code Playground

Free online HTML, CSS, and JavaScript editor with live preview, interactive console, and responsive testing. Perfect for web development, frontend prototyping, and learning to code.

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Features

Live Preview

Instantly see the results of your HTML, CSS, and JavaScript as you type

Three-Panel Editing

Dedicated panels for HTML, CSS, and JavaScript code with synchronized editing

Interactive Console

View console.log outputs and debug JavaScript errors in real-time

Code Formatting

One-click formatting for beautiful, readable code with proper indentation

Syntax Highlighting

Enhanced readability with color-coded syntax for all three languages

Responsive Testing

Test your designs across different screen sizes with the preview pane

Frequently Asked Questions

How do I create a responsive website layout using HTML CSS flexbox grid?

Learn how to create responsive layouts:

<!-- Responsive viewport meta tag -->
<meta name="viewport" content="width=device-width, initial-scale=1.0">

<!-- Flexbox container example -->
<div class="flex-container">
    <div class="flex-item">Item 1</div>
    <div class="flex-item">Item 2</div>
</div>

/* Flexbox layout */
.flex-container {
    display: flex;
    justify-content: space-between;
    flex-wrap: wrap;
}

/* Grid layout */
.grid-container {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 1rem;
}

/* Responsive breakpoints */
@media (max-width: 768px) {
    .flex-container {
        flex-direction: column;
    }
}

Test responsiveness by resizing the preview window in our editor.

What's the best way to learn frontend development for beginners?

Start with these fundamental examples:

<!DOCTYPE html>
<html>
<head>
    <title>My First Website</title>
    <link rel="stylesheet" href="styles.css">
</head>
<body>
    <header>
        <h1>Welcome to My Site</h1>
        <nav>
            <a href="#">Home</a>
            <a href="#">About</a>
        </nav>
    </header>
    <main>
        <p>Start with basic HTML structure</p>
    </main>
</body>
</html>

/* Basic styling */
body {
    font-family: Arial, sans-serif;
    line-height: 1.6;
    margin: 0;
    padding: 20px;
}

nav a {
    margin-right: 10px;
    text-decoration: none;
}

// Add interactivity
document.querySelector('h1').addEventListener('click', function() {
    this.style.color = '#' + Math.floor(Math.random()*16777215).toString(16);
});

Practice by modifying these examples and watching real-time changes. Try building simple projects like a personal website, a to-do list, or an interactive form.

How can I add Bootstrap or Material UI to my front-end project?

Here's how to integrate popular frameworks:

<!DOCTYPE html>
<html>
<head>
    <!-- Bootstrap CSS -->
    <link href="https://cdn.jsdelivr.net/npm/bootstrap@5.3.0/dist/css/bootstrap.min.css" rel="stylesheet">
    
    <!-- Material Icons -->
    <link href="https://fonts.googleapis.com/icon?family=Material+Icons" rel="stylesheet">
</head>
<body>
    <!-- Bootstrap example -->
    <div class="container">
        <button class="btn btn-primary">Click me</button>
    </div>

    <!-- Material icon example -->
    <span class="material-icons">favorite</span>

    <!-- Bootstrap JavaScript Bundle with Popper -->
    <script src="https://cdn.jsdelivr.net/npm/bootstrap@5.3.0/dist/js/bootstrap.bundle.min.js"></script>
</body>
</html>

After adding these CDN links, you can use the framework's classes and components in your HTML.

How do I troubleshoot JavaScript errors in my web development code?

Here are some debugging techniques:

// Basic console logging
console.log('Debugging started');

// Check variable values
const user = { name: 'John', age: 30 };
console.log('User:', user);

// Async code debugging
async function fetchData() {
    try {
        const response = await fetch('https://api.example.com/data');
        const data = await response.json();
        console.log('Data:', data);
    } catch (error) {
        console.error('Error:', error);
    }
}

// DOM debugging
const element = document.querySelector('#myElement');
console.log('Element:', element);

Use our built-in console panel to view these logs and error messages.

Can I build a dynamic website without a backend using only HTML CSS JavaScript?

Yes! Here's an example of a client-side todo app:

// Local storage example
const todos = JSON.parse(localStorage.getItem('todos')) || [];

function addTodo(text) {
    const todo = {
        id: Date.now(),
        text,
        completed: false
    };
    todos.push(todo);
    localStorage.setItem('todos', JSON.stringify(todos));
}

// API fetch example
async function getWeather(city) {
    const response = await fetch(
        `https://api.weatherapi.com/v1/current.json?q=${city}`
    );
    const data = await response.json();
    return data;
}

// DOM manipulation
function renderTodos() {
    const list = document.querySelector('#todoList');
    list.innerHTML = todos
        .map(todo => `
            <li class="${todo.completed ? 'completed' : ''}">
                ${todo.text}
            </li>
        `)
        .join('');
}

Our editor is perfect for learning these front-end development techniques.

How do I create animations and transitions with CSS and JavaScript?

Create engaging animations with CSS and JavaScript:

/* CSS Animations */
@keyframes slide {
    from { transform: translateX(0); }
    to { transform: translateX(100px); }
}

.animated-element {
    animation: slide 2s ease infinite;
}

/* CSS Transitions */
.button {
    transition: all 0.3s ease;
}

.button:hover {
    transform: scale(1.1);
    background-color: #ff0000;
}

// JavaScript animations
const element = document.querySelector('.element');

// Using Web Animations API
element.animate([
    { transform: 'translateY(0px)' },
    { transform: 'translateY(-20px)' }
], {
    duration: 1000,
    iterations: Infinity,
    direction: 'alternate'
});

// Class-based animation
element.addEventListener('click', () => {
    element.classList.add('animated');
});

Try these examples in our editor and watch the animations in real-time.