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<!DOCTYPE html> <html> <body> <h3>A demonstration of how to access a FIELDSET element</h3> <fieldset id="myFieldset" name="personalia"> Name: <input type="text" name="username"><br> Email: <input type="text" name="usermail"><br> </fieldset> <p>Click the button to disable the fieldset.</p> <button onclick="myFunction()">Try it</button> <script> function myFunction() { var x = document.getElementById("myFieldset"); x.disabled = true; } </script> </body> </html>