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<!DOCTYPE html> <html> <body> <h1>The Document Object</h1> <h2>The open() Method</h2> <p>If document.write() is used on a closed document, document.open() is automatically called.</p> <p>This will delete existing content.</p> <button onclick="myFunction()">Try it</button> <script> function myFunction() { document.write("<h1>Hello World</h1>"); } </script> </body> </html>
