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<!DOCTYPE html> <html> <body> <p>Open a new window, and resize the width and height to 500px:</p> <button onclick="openWin()">Create window</button> <button onclick="resizeWin()">Resize window</button> <script> var myWindow; function openWin() { myWindow = window.open("", "", "width=100, height=100"); } function resizeWin() { myWindow.resizeTo(250, 250); myWindow.focus(); } </script> </body> </html>