JSFiddle - React, Tailwind, and code Playground

JavaScript

// Returns the version of Internet Explorer or a -1 (indicating the use of another browser)
function getInternetExplorerVersion(){
  var rv = -1; // Return value assumes failure.
  if (navigator.appName == 'Microsoft Internet Explorer'){
    var ua = navigator.userAgent;
    var re  = new RegExp("MSIE ([0-9]{1,}[\.0-9]{0,})");
    if (re.exec(ua) != null)
      rv = parseFloat( RegExp.$1 );
    }
  return rv;
}
function displayAlert(){
  var msg = "You're not using Internet Explorer.";
  var ver = getInternetExplorerVersion();
  if ( ver > -1 ){
    if ( ver <= 8.0 ){
      msg = "You're using Internet Explorer 8 or below" ;
    }
    else if ( ver >= 9.0 && ver < 10.0 ){
      msg = "You're using IE 9 or above";
    }
    else{
      msg = "You're using IE 10"; 
    }
  }
  alert( msg );
}
displayAlert()