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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><p>Click the button below to to disable the fieldset above.</p><button onclick="myFunction()">Try it</button><script>function myFunction() { document.getElementById("myFieldset").disabled = true;}</script></body></html>