JSFiddle - React, Tailwind, and code Playground

HTML

<h1>Cliquez ici pour donner le focus avant de tester</h1>

JavaScript

(function(){
  var isAlt = false;
  $(document).keydown(function(e) {
    console.log('keydown', e.which);
    if (e.which == 18) {
      isAlt = true;
    }
    else if (e.which == 67 && isAlt) {
      alert('alt+c wins!');
    }
  }).keyup(function(e) {
    console.log('keyup', e.which);
    if (e.which == 18) {
      isAlt = false;
    }
  });
})();