HTML Code

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>migrate to keydown</title>
</head>
<body>
  <input placeholder="Prefer keydown">
  <pre id="out">(waiting)</pre>
  <script>
    var input = document.querySelector("input");
    var out = document.getElementById("out");
    function logKey(e) {
      out.textContent = "Modern keydown: " + e.key + " / " + e.code;
    }
    input.addEventListener("keydown", logKey);
  </script>
</body>
</html>

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Element keypress — migrate to keydown (Try It)