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<!DOCTYPE html> <html> <head> <script> var w; function openwindow() { w = window.open('','', 'width=100,height=100'); w.focus(); } function myFunction() { w.resizeBy(50, 50); w.focus(); } </script> </head> <body> <button onclick="openwindow()">Create window</button> <button onclick="myFunction()">Resize window</button> </body> </html>