<p>
  Press any character key, with or without holding down the CTRL key.<br />
  You can also use the SHIFT key together with the CTRL key.
</p>
<pre id="output"></pre>

const output = document.getElementById("output");

function showChar(e) {
  output.textContent = `Key KeyDown: "${e.key}"
CTRL key KeyDown: ${e.ctrlKey}
`;
}

document.addEventListener("keydown", showChar);