JSFiddle - React, Tailwind, and code Playground

HTML

<button id="open" type="button">Open Window</button>
<button id="close" type="button">Close Window</button>

JavaScript

let newWindow = null;

document.querySelector("#open").addEventListener("click", function(){
  newWindow = window.open("https://example.com", "popup, height=200, width=200");  
});

document.querySelector("#close").addEventListener("click", function(){
  newWindow.close(); 
});