HTML Code

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>IME-safe shortcut</title>
</head>
<body>
  <p>Press Ctrl+S (Windows/Linux) or Cmd+S (Mac).</p>
  <pre id="out">(waiting)</pre>
  <script>
    var out = document.getElementById("out");
    document.addEventListener("keydown", function (event) {
      if (event.isComposing || event.keyCode === 229) {
        return;
      }
      if ((event.ctrlKey || event.metaKey) && event.key.toLowerCase() === "s") {
        event.preventDefault();
        out.textContent = "Save shortcut handled";
      }
    });
  </script>
</body>
</html>

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Element keydown — IME-safe shortcut (Try It)