Copy text to clipboard with pure JavaScript

copy.js

function copy(text) {
  const textarea = document.createElement("textarea");
  textarea.style.opacity = '0';
  textarea.style.position = 'fixed';
  textarea.textContent = text;
  const body = document.getElementsByTagName('body')[0];
  body.appendChild(textarea);
  textarea.select();
  document.execCommand('copy');
  body.removeChild(textarea);
}