JSFiddle - React, Tailwind, and code Playground

JavaScript

var str = '';
var info = $('<div>').css({
	'position':'absolute'
  ,'z-index':10000
	,'left':0
	,'top':0
	,'background-color':'#eee'
}).appendTo(document.body);

$(document).keypress(function(e){
	e.preventDefault();
  if(e.key == 'Backspace'){
  	str = str.slice(0, -1);
  }else if(e.key == 'Delete'){
  	str = '';
  }else{
  	str += e.key;
  }
  info.text(str);
  if (str === 'работает') {
    alert('OK');
  }
})