Code Play - HTML + CSS + JavaScript

Write HTML, CSS, and JavaScript code and see the live preview instantly. Perfect for testing web development code snippets and learning frontend development.

What is Code Play?

Code Play is an interactive code editor that allows you to write HTML, CSS, and JavaScript code and see the live preview instantly. It's perfect for:

  • Learning web development: Practice HTML, CSS, and JavaScript in a safe environment
  • Testing code snippets: Quickly test ideas and see results immediately
  • Prototyping: Create quick prototypes and mockups
  • Debugging: Isolate and test specific code components
  • Sharing code: Create shareable examples and demos

Features

HTML Editor

Write semantic HTML markup with syntax highlighting and validation.

CSS Styling

Style your HTML with CSS including modern properties and selectors.

JavaScript Logic

Add interactivity with JavaScript including DOM manipulation and events.

How to Use Code Play

  1. Write HTML: Start with the HTML structure in the first editor
  2. Add CSS: Style your HTML with CSS in the second editor
  3. Include JavaScript: Add interactivity with JavaScript in the third editor
  4. Play Code: Click the "Play Code" button to see your live preview
  5. Iterate: Make changes and click "Play Code" again to see updates

Supported Technologies

HTML5
Structure & Semantics
CSS3
Styling & Layout
ES6+
Modern JavaScript
Live Preview
Instant Results

💡 Pro Tips

  • Use the "Clear All" button to start fresh
  • Copy individual code sections using the Copy buttons
  • Download your code as separate files for offline use
  • Open the preview in a new tab for full-screen testing
  • Each editor supports up to 10000 characters

Common Use Cases

🎓 Learning & Education

Perfect for students learning web development. Test concepts, experiment with different approaches, and see immediate results.

🚀 Quick Prototyping

Rapidly prototype UI components, test new ideas, and create proof-of-concept demos without setting up a full development environment.

🐛 Debugging & Testing

Isolate problematic code, test specific functions, and debug issues in a controlled environment with instant feedback.

📤 Code Sharing

Create shareable code examples, demonstrate solutions, and collaborate with others by sharing working code snippets.

Frequently Asked Questions

How does Code Play work?

Code Play allows you to write HTML, CSS, and JavaScript code in separate editors. When you click "Play Code", it combines all three into a complete HTML document and displays the live preview in a sandboxed iframe. This lets you see your code in action instantly without setting up a development environment.

What's the difference between Full Screen and Container mode?

Full Screen mode: Your HTML code is placed directly in the body tag, allowing your CSS to control the entire page layout, including body and html elements. Perfect for complete page designs and layouts.

Container mode: Your HTML code is wrapped in a styled container with padding, background, and shadow. Better for component-level testing and when you want to see your code within a defined boundary.

Why are @import statements removed from my CSS?

@import statements (like Google Fonts imports) are automatically removed because they don't work reliably in sandboxed iframes due to security restrictions. This ensures your code runs consistently. For fonts, consider using web-safe fonts or the built-in system font stack.

What are the character limits for each editor?
  • HTML Editor: 5,000 characters maximum
  • CSS Editor: 5,000 characters maximum
  • JavaScript Editor: 5,000 characters maximum

These limits ensure optimal performance and prevent browser memory issues. For larger projects, consider using a full development environment.

Can I use external libraries or frameworks?

Yes! You can include external libraries by adding script tags in your HTML editor. For example, you can include jQuery, React, Vue, or any other CDN-hosted library. Just add the script tags to your HTML code and the libraries will be available in your JavaScript.

Is my code secure and private?

Your code runs in a sandboxed iframe for security, but it's processed client-side in your browser. We don't store or transmit your code to our servers. However, avoid entering sensitive information like passwords or API keys, as the code runs in your browser where it could potentially be visible.

How can I save or share my code?

You can save your code using several methods:

  • Use the Copy buttons to copy individual code sections
  • Use the Download buttons to save files locally
  • Use the Open in New Tab button to view the full preview
  • Take screenshots of your preview for sharing visual results