How do I capture a CTRL-S without jQuery or any other library?

Question

How do I go about capturing the CTRL + S event in a webpage?

I do not wish to use jQuery or any other special library.

Thanks for your

Answer 1

document.onkeydown = function(e) {
    if (e.ctrlKey && e.keyCode === 83) {
        alert('strg+s');
    }
    return false;
};

Some events can't be captured, since they are capture by the system or application.