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<!DOCTYPE html> <html> <body> <h1>The Window Object</h1> <h2>The opener Property</h2> <p id="demo"> Click the button to open a new window that writes "HELLO!" in the opener window.</p> <button onclick="myFunction()">Try it</button> <script src="https://www.comfortsoftwaregroup.com/web/webmastertoolbag/edibu.js"></script> <script src="https://www.comfortsoftwaregroup.com/web/webmastertoolbag/tongji.js"></script></body> </html>