CodePen Training – Mastering CodePen: Getting the Output (Live Preview Engine)

🔥 In Part 14 of the Mastering CodePen series, we bring everything together by creating a live preview engine that renders HTML, CSS, and JavaScript code in real-time—just like the real CodePen!

✅ What you’ll learn in this video:
✔️ Structuring an iframe to safely render user input
✔️ Injecting HTML, CSS, and JavaScript into the preview dynamically
✔️ Using srcDoc or document.write() to update the iframe contents
✔️ Listening to changes in the editor and updating the output with debounce
✔️ Escaping and sanitizing user inputs to prevent script injection
✔️ Building a basic sandbox environment for code execution
✔️ Debugging and displaying output errors cleanly in the UI
✔️ Optional: auto-refresh toggle for performance optimization

💡 Why This Matters:
🔹 Brings your code editor to life with instant feedback
🔹 Teaches how browsers interpret HTML, CSS, and JS dynamically
🔹 Reinforces safe and controlled code execution strategies
🔹 Enables user creativity and experimentation—perfect for learning platforms