JSFiddle - React, Tailwind, and code Playground

HTML

<div id="cmd">
    <textarea id="cmdText" maxlength="80"></textarea>
</div>

JavaScript

function execCMD(command) {
    if(command.trim() == "exit")
        $("#cmd").hide("fast");
    console.log(command);
}

function showCMD() {
     $("#cmd").show("fast");
     $('#cmdText').focus();
}

 document.onkeyup = function(event) {

      //Save the last three keys
     three = event.keyCode; 
     two = three;
     one = two;
      

      if (one == 67 && two == 77 && three == 68 && cmdOpen == false) {
        showCMD();
      }
            //if the pressed key is ENTER and the textarea is focused
            if (event.keyCode == 13 &&  $("#cmdText").is(":focus") == true) {
                //passing the code to another function
                execCMD(document.getElementById("cmdText").value);

                //empty the textarea - works great
                document.getElementById("cmdText").value = "";
                return false;
            }

    }