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The preventDefault()
method cancels the event if it is cancelable, meaning that the default action that belongs to
the event will not occur. Not all events are cancelable. Use the cancelable property to find out if an event is cancelable.
https://www.w3schools.com/jsref/event_preventdefault.asp
https://developer.mozilla.org/en-US/docs/Web/API/Event/preventDefault
document.querySelector("#id-checkbox").addEventListener("click", function (event)
{
document.getElementById("output-box").innerHTML += "Sorry! <code>preventDefault()</code> won't let you check this!<br />";
event.preventDefault();
}, false);