Detect browser keyboard presses, with control

If you want to detect when control is pressed, or similar, then:

window.addEventListener("keydown", event => {
    if (!(event.which == 115 && event.ctrlKey)) return true;
    alert("Ctrl-S pressed");
    // don't do what it normally does
    // don't continune propagating the event
    return false;

Edit on github
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