JSFiddle - React, Tailwind, and code Playground

HTML

<form name="form1">
<b>Type value in field:&nbsp; See what you typed:</b><br>
<input type = "text" name = "text1" onKeyPress="DisplayMsg(event)" size="20">
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
<input type = "text" name = "text2" onKeyPress="DisplayMsg(event)" size="20">
</form>

JavaScript

function DisplayMsg(key_event)
{
    if (document.all) //Checks for IE 4.0 or later
    {
      document.form1.text2.value = String.fromCharCode(event.keyCode);
    }
    else if (document.getElementById) //checks for Netscape 6 or later
    {
      document.form1.text2.value = String.fromCharCode(key_event.which);
    }
    else if (document.layers) //Checks for Netscape 4
    {
      document.form1.text2.value = String.fromCharCode(key_event.which);
    }
}
document.onkeypress = DisplayMsg;