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<!DOCTYPE html> <html> <body> <p>Click the button to display the user-agent header sent by the browser to the server.</p> <button onclick="myFunction()">Try it</button> <p id="demo"></p> <script> function myFunction() { var x = "User-agent header sent: " + navigator.userAgent; document.getElementById("demo").innerHTML = x; } </script> </body> </html>