Copies number and issue title to clipboard on click

github_issue_title.js

// ==UserScript==
// @name         github issue title
// @namespace    http://tampermonkey.net/
// @version      0.1
// @description  try to take over the world!
// @author       You
// @match        https://github.com/*
// @grant        GM_setClipboard
// ==/UserScript==

(function() {
  'use strict';

  document.addEventListener('click', (e) => {
    let title
    if (e.target.classList.contains('gh-header-title') && e.target.firstElementChild.classList.contains('js-issue-title')) {
      title = e.target.firstElementChild
    } else if (e.target.classList.contains('js-issue-title')) {
      title = e.target
    } else {
      return
    }

    title.parentElement.style.backgroundColor = '#c2e5f9'
    setTimeout(() => { title.parentElement.style.backgroundColor = '' }, 300)

    let number = (title.nextElementSibling && title.nextElementSibling.classList.contains('f1-light')) ? `${title.nextElementSibling.innerText}: ` : ''
    GM_setClipboard(`${number}${title.innerText}`)
  })
})();