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<!DOCTYPE html> <html> <body> <p>Click the button to open an output stream in a new window, add some text, then close the output stream.</p> <button onclick="myFunction()">Try it</button> <script> function myFunction() { var w = window.open(); w.document.open(); w.document.write("<h1>Hello World!</h1>"); w.document.close(); } </script> </body> </html>