code: function copy(text) {
    var fakeElem = document.body.appendChild(document.createElement('textarea'));
    fakeElem.style.position = 'absolute';
    fakeElem.style.left = '-9999px';
    fakeElem.setAttribute('readonly', '');
    fakeElem.value = text;
    fakeElem.select();
    try {
      return document.execCommand('copy');
    } catch (err) {
      return false;
    } finally {
      fakeElem.parentNode.removeChild(fakeElem);
    }
  }
docs: Copy a snippet of text to a user's pasteboard if the user has
  proper browser support.
  
  @param {string} text text snippet
  @returns {boolean} whether the text was copied
  @example
  // using browser events with a click
  var eCopy = require('execcommand-copy');
  var a = document.getElementById('mybutton');
  a.addEventListener('click', function() {
  eCopy.copy(this.innerHTML);
  });