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<!DOCTYPE html> <html> <body> <p>Open a new window, and decrease the new window's width by 50px, and increase the height by 50px.</p> <p><b>Tip:</b> Click the "Resize window" button multiple times.</p> <button onclick="openWin()">Create window</button> <button onclick="resizeWin()">Resize window</button> <script> var myWindow; function openWin() { myWindow = window.open("", "", "width=500, height=500"); } function resizeWin() { myWindow.resizeBy(-50, 50); myWindow.focus(); } </script> </body> </html>