Copy Markdown-Format Address

Copy current tab title and url, and convert to markdown syntax
As of 12. 02. 2018. See the latest version.
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// ==UserScript==
// @name         Copy Markdown-Format Address
// @namespace    undefined
// @version      0.1
// @description  Copy current tab title and url, and convert to markdown syntax
// @author       https://github.com/Dream4ever
// @match        *://*/*
// @grant        none
// ==/UserScript==

// Thanks to https://stackoverflow.com/questions/400212/
// solved the problem of unable select text
// of none-displayed textarea

(function () {
  'use strict';

  window.onload = function () {
    var rdnId = Math.random().toString(36).substring(5);
    var nodeButton = document.createElement('button');
    nodeButton.setAttribute('id', rdnId);
    nodeButton.innerHTML = 'Copy';
    nodeButton.style.fontSize = '14px';
    nodeButton.style.color = '#000';
    nodeButton.style.width = '80px';
    nodeButton.style.padding = '5px 10px';
    nodeButton.style.borderRadius = '5px';
    nodeButton.style.background = 'rgb(240, 240, 240)';
    nodeButton.style.boxShadow = '3px 3px 3px rgba(0, 0, 0, .1)';
    nodeButton.style.position = 'fixed';
    nodeButton.style.bottom = '20px';
    nodeButton.style.right = '70px';
    nodeButton.style.zIndex = 2;
    document.body.appendChild(nodeButton);

    nodeButton.addEventListener('click', function (event) {

      // get title and url
      var title = document.title;
      var url = document.URL;
      var address = '[' + title + '](' + url + ')';

      if (copyTextToClipboard(address)) {
          nodeButton.innerHTML = 'Done';
          setTimeout(function() { nodeButton.innerHTML = 'Copy'; }, 2000);
      } else {
          nodeButton.innerHTML = 'Failed';
          setTimeout(function() { nodeButton.innerHTML = 'Copy'; }, 2000);
      }
    });
  };

})();

function copyTextToClipboard(text) {
  var textArea = document.createElement("textarea");

  textArea.style.position = 'fixed';
  textArea.style.top = 0;
  textArea.style.left = 0;

  textArea.style.width = '2em';
  textArea.style.height = '2em';

  textArea.style.padding = 0;

  textArea.style.border = 'none';
  textArea.style.outline = 'none';
  textArea.style.boxShadow = 'none';

  textArea.style.background = 'transparent';

  textArea.value = text;

  document.body.appendChild(textArea);

  textArea.select();

  var isOK = false;

  try {
    var successful = document.execCommand('copy');
    isOK = !!successful;
  } catch (err) {}

  document.body.removeChild(textArea);

  return isOK;
}