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<!DOCTYPE html> <html> <body> <form> <fieldset id="myFieldset" name="personalia"> Name: <input type="text" name="username"><br> Email: <input type="text" name="usermail"><br> </fieldset> </form> <p>Click the button to display the new name of the fieldset.</p> <button onclick="myFunction()">Try it</button> <p id="demo"></p> <script> function myFunction() { document.getElementById("myFieldset").name = "newName"; document.getElementById("demo").innerHTML = document.getElementById("myFieldset").name; } </script> </body> </html>