JSFiddle - React, Tailwind, and code Playground

HTML

<input type="text" class="test">
<div class="result"></div>

JavaScript

const input = document.querySelector(".test");
const result = document.querySelector(".result");

input.onkeyup =  input.oncopy = input.onpaste = input.oncut = event => {
  if (event.target.value == "value") { // any some condition
    document.querySelector(".test").style.color = "red";
    // or some code
  } else {
  	document.querySelector(".test").style.color = "black";
  }
};