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<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>