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<!DOCTYPE html> <html> <body> <p>Input your age and click the button:</p> <input id="age" value="18"> <button onclick="myFunction()">Try it</button> <p id="demo"></p> <script> function myFunction() { var age, voteable; age = document.getElementById("age").value; voteable = (age < 18) ? "Too young":"Old enough"; document.getElementById("demo").innerHTML = voteable + " to vote."; } </script> </body> </html>