Casella Check controllata se selezionata

https://www.w3schools.com/howto/howto_js_display_checkbox_text.asp

<!DOCTYPE html>
<html>
<body>

<p>Display some text when the checkbox is checked:</p>

Checkbox: <input type="checkbox" id="myCheck" onclick="myFunction()">

<p id="text" style="display:none">Checkbox is CHECKED!</p>

<script>
function myFunction() {
var checkBox = document.getElementById("myCheck");
var text = document.getElementById("text");
if (checkBox.checked == true){
text.style.display = "block";
} else {
text.style.display = "none";
}
}
</script>

</body>
</html>