Tryit Editor v1.4

<html> <head> <script type="text/javascript"> function resizeWindow() { top.resizeTo(500,300); } </script> </head> <body> <form> <input type="button" onclick="resizeWindow()" value="Resize window"> </form> <p><b>Note:</b> We have used the <b>top</b> element instead of the <b>window</b> element, to represent the top frame. If you do not use frames, use the <b>window</b> element instead.</p> </body> </html> | Your Result:
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