Vanilla JS: Totally disabling a “save” functionality in webpages

Question

Assume I\'m a junior Wikipedia user that just want to experiment with changing some wikipedian content with the Wiki text editor in an edit-page, but not saving my changes in an

Answer 1

Onclick you could prevent the default action.

document.addEventListener('keypress', function(e) {
    if (event.keyCode == 16 && event.keyCode == 18 && event.keyCode == 83) {
           e.preventDefault();
    }
});