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<iframe src="https://viewcode.cunghocweb.com/trycode-full.php?id=38" style="width: 100%; height: 200px; border: 1px solid #ddd; border-radius: 10px; background: #fff"></iframe>
<!DOCTYPE html> <html> <head> <title>Page Title</title> </head> <body> <h1>My First Heading</h1> <p>My first paragraph.</p> </body> </html>