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<!DOCTYPE html> <html> <body> <p>Click the button to demonstrate line-breaks in a confirm box.</p> <button onclick="myFunction()">Try it</button> <p id="demo"></p> <script> function myFunction() { var txt; var r = confirm("Press a button!\nEither OK or Cancel.\nThe button you pressed will be displayed in the result window."); if (r == true) { txt = "You pressed OK!"; } else { txt = "You pressed Cancel!"; } document.getElementById("demo").innerHTML = txt; } </script> </body> </html>