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<html><body><form> <fieldset id="myFieldset"> <legend>Personalia:</legend> Name: <input type="text"><br> Email: <input type="text"><br> Date of birth: <input type="text"> </fieldset></form><br><button onclick="disableField()">Disable fieldset</button><button onclick="undisableField()">Undisable fieldset</button><script>function disableField() { document.getElementById("myFieldset").disabled = true;}function undisableField() { document.getElementById("myFieldset").disabled = false;}</script></body></html>