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<!DOCTYPE html> <html> <body> <p>Click the button to display the extracted part of the string.</p> <button onclick="myFunction()">Try it</button> <p id="demo"></p> <p><strong>Note:</strong> The repeat() method is not supported in IE 11 (and earlier versions).</p> <script> function myFunction() { var str = "Hello world!"; document.getElementById("demo").innerHTML = str.repeat(2); } </script> </body> </html>