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<!DOCTYPE html> <html> <body> <p>Click the button to change the location of the first iframe element (index 0).</p> <button onclick="myFunction()">Try it</button> <br><br> <iframe src="../index.html"></iframe> <iframe src="../index.html"></iframe> <script> function myFunction() { window.frames[0].location = "http://www.w3ii.com/jsref"; } </script> </body> </html>