JSFiddle - React, Tailwind, and code Playground

HTML

<div class="header">
  <div class="ip">
    <span>
play.ddogsworld.com</span>
  </div>
</div>

JavaScript

var ipaddress = document.querySelector(".ip span");
if (ipaddress.addEventListener) ipaddress.addEventListener('click', copyIp, false);
else ipaddress.attachEvent('onclick', copyIp);
var click = new Event('click');
ipaddress.dispatchEvent(click);

function copyIp() {
  ipaddress.select();
  document.execCommand("copy");
  alert("Copied the text: " + ipaddress.value);
}