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<!DOCTYPE html> <html> <body> A hidden input field: <input type="hidden" id="myInput" name="country" value="Norway"> <p>Click the buttons to display and/or change the value of the value attribute of the hidden input field.</p> <button onclick="display()">Display value</button> <button onclick="change()">Change value</button> <script> function display() { var x = document.getElementById("myInput").value; alert("The value of the hidden input field is: " + x); } function change() { var x = document.getElementById("myInput").value="USA"; alert ("The value was changed to: " + x); } </script> </body> </html>