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<!doctype html> <html> <head> <meta charset="utf-8"> <title>Demo</title> <style>body{font-family:sans-serif;} h1{color:#2b6cb0;}</style> </head> <body> <h1>Hello from your live preview ✨</h1> <script>console.log('This runs inside the iframe');</script> </body> </html>